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Hajime NAKAJIMA, Satoshi KOMODA, Shigeto FUJII, Yuichiro ISHINABE
2018 Volume 24 Issue 56 Pages
35-40
Published: 2018
Released on J-STAGE: February 20, 2018
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In February 2014, some large-scale buildings around Tokyo were collapsed or damaged by heavy snow. For light-snow region, using amount of rainfall instead of ground snow depth is recommended to estimate ground snow weight. However, wind influences the amount of rainfall caught by gauges. In this paper, three factors are reported. 1) Survey of conditions at weather observation stations. 2) Analysis of difference between AIJ Recommendations for Loads on Buildings and this survey on conditions of estimating wind speed. 3) Estimation ground snow depth and weight based on this survey. Through this survey, strong effect of wind speed is elucidated.
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Naoto KAMOSHITA, Hiroki HAMAGUCHI, Yuma TANI, Shigenobu SUZUKI
2018 Volume 24 Issue 56 Pages
41-46
Published: 2018
Released on J-STAGE: February 20, 2018
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A study of aging effects on natural rubber bearing that was installed in a seismically isolated building about 30 years ago was conducted. The dynamic properties of natural rubber bearing, physical properties and chemical properties of rubber were examined and there were no significant changes compared with original properties. The creep deformation of the natural rubber bearing was also measured. It was confirmed that creep deformation corresponded precisely to the prediction formula. It was assumed that aging doesn’t lead to any significant change of the rubber bearing characteristics.
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Hidetaka FUNAKI, Yoshiki KOYAMA, Yuji FUNAYAMA, Takeshi SAWADA, Fumito ...
2018 Volume 24 Issue 56 Pages
47-52
Published: 2018
Released on J-STAGE: February 20, 2018
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The 2011 off the pacific coast of Tohoku earthquake and the 2016 Kumamoto earthquake shook many automated storage and retrieval systems and caused palletized goods to fall down from the storage racks. The authors have developed a seismic isolation system in the direction of rack opening for automatic warehouse to prevent goods falling. In this study, shaking table tests were conducted to evaluate a seismic isolation system using inclined rail bearings. As a result, it has been demonstrated that the newly developed seismic isolation system is effective in preventing stored goods from falling down from rack shelves.
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Tetsushi INUBUSHI, Yuji MIYAMOTO, Takahisa ENOMOTO
2018 Volume 24 Issue 56 Pages
53-57
Published: 2018
Released on J-STAGE: February 20, 2018
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In this paper, we conducted simulation analyses of collision experiments on retaining wall of base-isolated building model using the simple modeling method for lateral resistance of retaining wall with backfill proposed by us. As the result, although the number of collision was evaluated more and the displacement of the seismic isolation layer was a little different, the acceleration response value at the collision to the retaining wall by analysis was relatively well corresponded to the experiment result, and the effectiveness of the simple modeling method could be shown.
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Daiki SATO, Sho NAGAYAMA, Kazuhiko KASAI, Kazuhiro MATSUDA
2018 Volume 24 Issue 56 Pages
59-62
Published: 2018
Released on J-STAGE: February 20, 2018
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The purpose of this paper is to carry out a response evaluation of passive control structure with viscous dampers considering its performance decrement under long-period ground motion. An analytical model of the viscous damper that considered the performance decrement caused by long-period cyclic loading was proposed in this paper, and its accuracy was confirmed by comparing with test results. The time history response analysis using 20-storey model with the proposed viscous dampers was performed. It was verified that the response of the passive control structure with viscous dampers increases under some long-period ground motions.
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Kazuhiro MATSUDA, Kazuhiko KASAI, Tetsuya NAKAMURA
2018 Volume 24 Issue 56 Pages
63-68
Published: 2018
Released on J-STAGE: February 20, 2018
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Hanging type cable rack system partially had serious damage during the Tohoku-oki Earthquake, March 11, 2011. The objective of this paper is to understand the seismic performance of the cable rack system and to propose passive control scheme for the system. Monotonic loading tests of the cable rack and shake table tests of hanged cable rack are conducted. Performance of the specimens is discussed by referring to maximum deformations, displacements, absolute accelerations, relationships of damper force and damper deformation.
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– Long-term variations Part 1 –
Minami KAWASE, Takayoshi AOKI, Daisuke SATO
2018 Volume 24 Issue 56 Pages
69-74
Published: 2018
Released on J-STAGE: February 20, 2018
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Structural health monitoring is a method of estimating the presence of the damage of the structure, and its position and degree by the change of static and dynamic characteristics before and after the secular change or the action of external force. However, the static and dynamic characteristics of the actual structural fluctuate on daily, seasonal and diachronic variations basis without depending on damage or not. These characteristics of reinforced concrete lighthouse were observed for about one and a half year by the authors. This paper presents long-term variations of crack widths, inclination angles, temperatures and natural frequencies of this lighthouse.
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Kayano SASAKI, Masayuki NAGANO, Arika HORI, Atsushi NOZU, Hidenori KAW ...
2018 Volume 24 Issue 56 Pages
75-80
Published: 2018
Released on J-STAGE: February 20, 2018
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This report describes simulation and evaluation of long-period ground motions in the Kanto plain using the two source models, i.e., the SMGA and SPGA models, for the 2011 Tohoku earthquake. The two source models are validated by comparison with recorded motions using the 3D finite difference method. Amplitude level of long-period ground motions in the Kanto plain are discussed by using a hypothetical source model assuming that rupture of the 4 SPGAs off Miyagi Prefecture occur at off Ibaraki Prefecture, resulting in larger long-period components between 2.5 to 4 s than those estimated in the previous studies.
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Rie OKAZAWA, Hiroshi KAMBARA, Masaaki SARUTA
2018 Volume 24 Issue 56 Pages
81-86
Published: 2018
Released on J-STAGE: February 20, 2018
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The purpose of this paper is to propose the evaluation curve of human senses to seismic vibration based on subject experiments. In this study, following results are obtained. 1) More than 50% of people feel in danger and attempt to take refuge action in SI (instrumental seismic intensity)=5.2 and feel anxious in SI=5.6. 2) When determining an evaluation curve by using probability distribution functions, using acceleration and SI are most suitable to the experiment results. Therefore, two kinds of the evaluation curves which use acceleration and SI are proposed.
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Yuji TAYA, Takehiro OKUMURA, Akihiko UCHIDA, Tsubasa SHIDA, Hiroyuki A ...
2018 Volume 24 Issue 56 Pages
87-92
Published: 2018
Released on J-STAGE: February 20, 2018
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To reduce the cost of jet grouting, we invented a new technique to construct rectangular-like columns instead of circular columns and set them in a row. This technique reduces the total number of columns, the production time and the production cost. Some field tests were conducted to construct the new columns. We succeeded in constructing the new columns and confirmed that the qualities and the construction efficiencies of the rectangular-like columns are not less than existing columns.
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Kiyoshi YAMASHITA, Tomohiro TANIKAWA
2018 Volume 24 Issue 56 Pages
93-98
Published: 2018
Released on J-STAGE: February 20, 2018
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Bearing capacity of piled raft foundations in clay soils was studied using elasto-plastic three-dimensional FE analysis. Additional parametric analyses varying pile spacing to the previous study were conducted. Moreover, the bearing capacities of piled rafts obtained from the numerical analyses were compared with the published results from six loading tests of model piled rafts. Based on the previous and present study, it was found that a formula for evaluating ultimate bearing capacity of piled raft foundations, which is approximately equal to 0.8 times the sum of bearing capacities of raft alone and pile group, would be appropriate for practical use.
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Hisatoshi KASHIWA, Toshio KOBAYASHI, Yuji MIYAMOTO
2018 Volume 24 Issue 56 Pages
99-104
Published: 2018
Released on J-STAGE: February 20, 2018
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The objective of this study is the evaluation of the lateral ground resistance around a steel pile with wings subjected cyclic loading at a pile cap. This paper presents the ground deformation and subgrade reaction - pile displacement relationships observed in situ tests under cyclic loading. The hysteresis curves have slip characteristics in case of steel pile with wings. The lateral ground resistance of a steel pile with wings can be evaluate in a limited depth by simplify method using solutions of elastic pile equation.
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Hajime NAKAJIMA, Yumiko YAMAZAKI, Yanjiao ZHANG, Takashi KASAHARA, Yui ...
2018 Volume 24 Issue 56 Pages
105-110
Published: 2018
Released on J-STAGE: February 20, 2018
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In past research, elasto-plastic behavior of structure with cables under earthquake load and the snow load was reported. Although specific stress-strain relationship of cables was assumed in such research, reliable data is currently available in limited diameter and wire constitution. In addition, the elongation distribution in the tensile test along overall length has not been reported. The goal in this research is to grasp characteristics until ultimate state (fracture), and to propose reliable stress-strain relationship model generally adaptable of structural cables.
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Seita TSUDA, Yoshiyuki NAKAHARA, Makoto OHSAKI
2018 Volume 24 Issue 56 Pages
111-116
Published: 2018
Released on J-STAGE: February 20, 2018
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We develop a new type of deployable bar structure that simulates the folding process of rigid origami called Yoshimura-pattern. Since Yoshimura-pattern origami has multi-DOFs (degrees-of-freedom), it can be folded symmetrically and asymmetrically with respect to parallel valley fold-lines. In our proposal, additional revolute joints are assigned to restrict asymmetric motion of the mechanism and reduce DOFs. To confirm the deployability, we evaluate the DOFs of the mechanisms in various states using singular value decomposition of equilibrium matrix. The size of bars and the offset of joints are rigorously considered. Small-scale physical models are also assembled to confirm the deployability.
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– Curved surface shape decision by genetic algorithms and mechanical behavior analysis of TOTO museum building –
Daisuke WADA, Toshio HONMA
2018 Volume 24 Issue 56 Pages
117-122
Published: 2018
Released on J-STAGE: February 20, 2018
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In this paper, we describe the example of the tunnel-shaped form building that was designed by structural morphogenesis and constructed. The genetic algorithms(GA) is applied to the structural morphogenesis of the framed construction of this tunnel type. In the numerical result, we show various solution forms of the arch shape by giving some design constraints. An effective structural form for the structure, the design, and the function is searched from the combination of the obtained arch shape. This simple structural morphogenesis procedure will become the hint of the design tool that decides the building shape.
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Satomi TOKUOKA, Masaru UCHIDA, Mina SUGINO, Yasuhiro HAYASHI
2018 Volume 24 Issue 56 Pages
123-128
Published: 2018
Released on J-STAGE: February 20, 2018
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In our research, we aim to provide a document that enable designers to easily recognize concerns which affect aseismic capacity of Kyo-machiya without carrying out frame analyses. To achieve the aim, we carried out frame analyses of typical frames to clarify concerns which affect their aseismic capacity in this paper. We revealed that the breakage of the through-column at the height of the beam or being pulled out and falling off of the beam may be caused depending on the deformation of the frame. These concerns can be solved by making the deformations of the first and second story uniform.
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Yujiro MIYATA, Yo OCHIAI, Kenji AOKI, Masahiro INAYAMA
2018 Volume 24 Issue 56 Pages
129-134
Published: 2018
Released on J-STAGE: February 20, 2018
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The new two type Massive Holz shear walls which doesn’t glued and can only be constructed with electric tools used by carpenters.
In addition to the racking test results of the shear walls, a numerical analysis model of the walls with pillars stacked with nails or screws was considered, and a design formula to estimate the allowable strength by the performance of nail or screw joints was proposed.
And the new type shear walls showed that they can be used for real wooden construction.
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Yudai KUDO, Shiro NAKAJIMA, Atsushi MIYATAKE, Yasuhiro ARAKI, Tatsuya ...
2018 Volume 24 Issue 56 Pages
135-140
Published: 2018
Released on J-STAGE: February 20, 2018
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CLT is a structural material laminated and glued such that grain directions are orthogonal to each adjacent layer. Since CLT has an orthogonal layer, it seems that there is a possibility that buckling properties differs from lumber and glue laminated timber. It is not certain whether calculation formula of buckling strength used for lumber or glue laminated timber can be applied to the calculation of buckling strength of CLT. In this study, the calculation formula of buckling strength of CLT was proposed and the validity of the formula was examined.
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Atsuo TAKINO, Sara YAGAMI, Masahide MURAKAMI
2018 Volume 24 Issue 56 Pages
141-146
Published: 2018
Released on J-STAGE: February 20, 2018
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This paper presents the results of bending experiments of traditional timber column joints reinforced by carbon fiber. The traditional timber column joint, which is called
Kanawa-tsugi joint, is used for the test specimens. The unreinforced specimens broke at the joint and the maximum strength of the unreinforced specimen was much lower than the standard strength calculated on the assumption that the specimen is the uniform member without the joint. On the other hand, the maximum strength of the reinforced specimen was much higher than that of the unreinforced specimens. As the results, the reinforcing effect was verified.
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Yasuhiro ARAKI, Shoichi NAKASHIMA, Shiro NAKAJIMA, Yoshinobu YAMAGUCHI
2018 Volume 24 Issue 56 Pages
147-152
Published: 2018
Released on J-STAGE: February 20, 2018
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In order to propose the opening reduction coefficient of the 5layer 5ply CLT wall panel, in-plane shear tests of the CLT wall panel with openings were tested.
The knowledges are (1) the maximum shear unit stress of the CLT wall with opening excluding the opening area is from 2.0 to 2.2 N/mm
2, (2) the relationship between the opening coefficient of the CLT wall and the stress ratio, the relationship of F=ϒ/(10-9ϒ) (at the real deformation angle) and F=ϒ/(5-4ϒ) (at the apparent deformation angle) are the best to predict these relationships.
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Koki TOYAMA, Sayuri HAYAKAWA, Yasuhiro NAMBU, Mina SUGINO, Chiaki WATA ...
2018 Volume 24 Issue 56 Pages
153-158
Published: 2018
Released on J-STAGE: February 20, 2018
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Waki-machi Minami-machi in Tokushima prefecture is designated as the important preservation district of groups of traditional buildings, which is close to the Nankai trough and the Median Tectonic Line fault zone. Our structural investigation of traditional wooden houses there shows the seismic performance of several houses is not sufficient because of heavy weight and less of wall. Some houses have tilted pillars which are considered to have been caused by the residual deformation of former ground motions. Yield base shear coefficients correlate with natural frequency, and the houses with low yield base shear coefficient have low natural frequency.
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Yujiro MIYATA, Kenji AOKI, Masahiro INAYAMA
2018 Volume 24 Issue 56 Pages
159-164
Published: 2018
Released on J-STAGE: February 20, 2018
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The load carrying capacity of shear walls can be strengthened by increasing the number of nails or screws to the structural panel elements.
However it will be difficult to secure the ductility as the strength increases.
Therefore, in this research, a design method for a true wall type shear wall to ensure high strength and ductility was proposed.
The shear walls were examined for case of using CLT or thick plywood as a structural panel elements.
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Masato NAKAO, Terusato INOUE, Kazuhiro INAGAKI, Yasunari UMEDA, Toyosh ...
2018 Volume 24 Issue 56 Pages
165-170
Published: 2018
Released on J-STAGE: February 20, 2018
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To clarify the failure mode, the shear strength and the deformation capacity of the mortar finishing external wall which constructed by ventilation method, static shear loading tests of the specimens with 910mm of wall length were conducted. The maximum shear strengths of the specimen with orthogonal walls and the one with a plywood as a shear wall were remarkably high. The maximum shear strengths during the tests were observed at from 1/75 rad to 1/30 rad, and the shear strengths disappeared over approximately 1/20 rad. However, the mortar layer did not fall off.
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Yusuke MAIDA, Shunsuke MAKITA, Tomoki NISHINA, Nobuyuki IZUMI
2018 Volume 24 Issue 56 Pages
171-176
Published: 2018
Released on J-STAGE: February 20, 2018
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This study involved the collection and analysis of data concerning the structural characteristics of approximately 600 high-rise RC buildings in Japan constructed from 1972 to 2015. The structural characteristics were analyzed focusing on differences in seismic resistant structures, seismic response control structures, and seismic isolation structures. The construction ratio of seismic response control structures and seismic isolation structures to all high-rise RC buildings increased with time. The number of floors and spans was increased because of the strengthening of construction materials and development in the technologies concerning seismic resistant structures, seismic response control structures, and seismic isolation structures.
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Yoshimichi KAWAI, Kazunori FUJIHASHI, Shigeaki TOHNAI, Atsushi SATO, T ...
2018 Volume 24 Issue 56 Pages
177-182
Published: 2018
Released on J-STAGE: February 20, 2018
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High-panelized shear walls in which steel sheets with burring holes aligned along the vertical direction are fastened to frame members and are applied to low & mid-rise buildings in seismically active regions. The wall that receives the in-plane shear force allows shear stress to concentrate in intervals between the holes. Finite element analyses and in-plane shear experiments revealed that all intervals between the holes of the wall were simultaneously deformed, and shear buckling areas were limited in the intervals by ring-shaped ribs of the burring holes.
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Jun IYAMA, Shintaro MATSUO, Shoichi KISHIKI, Takanori ISHIDA, Koji AZU ...
2018 Volume 24 Issue 56 Pages
183-188
Published: 2018
Released on J-STAGE: February 20, 2018
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This paper reports an outline of a reconnaissance result of 185 steel school buildings including 102 gymnasiums damaged by the 2016 Kumamoto Earthquake. The reconnaissance has been performed by the Damage Evaluation Working Group of the Subcommittee on Seismic Performance of School Buildings, Architectural Institute of Japan. The structural, non-structural and overall damage has been ranked based on the “Standard for Post-earthquake Damage Evaluation of Damaged Buildings” published by the Japan Building Disaster Prevention Association. The damage rank of investigated buildings is shown and discussed in terms of building type, year of construction, whether seismically reinforced or not, etc. Some of characteristical damage of structural and non-structural components are also presented in this paper.
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Masanori FUJITA, Mayo OTAKI, Yuki OKOSHI, Takamasa KIKUCHI, Kazuhisa K ...
2018 Volume 24 Issue 56 Pages
189-193
Published: 2018
Released on J-STAGE: February 20, 2018
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In light of the global environment, the authors proposed a building system comprising steel and timber (Hereafter referred to as CSTS), which consist of rolled section steels and timbers. A design method of the CSTS uses the concept of a damage controlled structure and its mechanical model is established based on the previous tests. In this study, we propose floor structure adapting for the CSTS using cross laminated timber. In-plane shear test of the joint which are consisted of unheaded studs or bolts for joint of the CSTS beam and floor structure is conducted. Structural performances of joint of the CSTS beam and floor structure are evaluated. The findings obtained from tests indicate that the joint of the CSTS beam and the floor structure has a high stiffness and strength.
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Sachi FURUKAWA, Takayuki YAMAGUCHI, Eiichiro SAEKI, Jun SHI, Yoshihiro ...
2018 Volume 24 Issue 56 Pages
195-200
Published: 2018
Released on J-STAGE: February 20, 2018
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The authors have proposed concept to realize beam yielding mechanism of a steel moment-resisting frame by applying a pin support system to midpoints of the first story columns. As a pin connection, an encapsulated-rubber rotational bearing is newly proposed. Seismic performance of the system is examined by a static cyclic loading test of a partial frame, consisting of the first story column and the second floor beams with an proposed rotational bearing. Test results showed a frame with a proposed rotation bearing had stable hysteresis behavior up to a story drift of 0.03 rad.
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Kazutaka SHIRAI, Masaru KIKUCHI, Ken ISHII, Sadamasa KOMAKI
2018 Volume 24 Issue 56 Pages
201-206
Published: 2018
Released on J-STAGE: February 20, 2018
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The main hall of Ohtaniha Hakodate Betsuin, which was completed in 1915, is the oldest temple architecture using reinforced concrete structure in Japan. The temple has been designated as an Important Cultural Property of Japan in 2007. In this paper, structural characteristics of the temple based on previous studies were described. Furthermore, evaluation of vibration behavior of the temple by micro-tremor observation and eigenvalue analysis using numerical 3-D frame models were presented. From the results, natural frequencies of the analytical model with decreased concrete Young’s modulus considering aging and construction situation showed a good agreement with the micro-tremor observation results.
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Naoyuki OI, Mayu ARIMA, Hironobu TAKAHASHI
2018 Volume 24 Issue 56 Pages
229-232
Published: 2018
Released on J-STAGE: February 20, 2018
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In this research work, the goal is to elicit evaluation structures of the environment which is difficult to recall by memories or usual elements used in the original procedure of Evaluation Grid Method, such as pictures. Therefore, the new procedure is proposed, that is, experiencing selected actual environments as elements before judging preferable environments.
This method including the procedure of experiencing actual environment is named the “Real-experienced-elements based Evaluation Grid Method”. The new method is applied on 3 kinds of environments which is difficult to recall by memories or pictures and their evaluation structures were effectively elicited.
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– The effect of sound absorbing materials and management efforts –
Ken MIYATSUKA, Kanako UENO
2018 Volume 24 Issue 56 Pages
233-236
Published: 2018
Released on J-STAGE: February 20, 2018
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A field study to improve sound environment was conducted in a nursery facility that worked on the reduction of its high sound level. First, sound absorbing materials onto the walls and ceilings, which shortened the reverberation time by half, was installed. Second, management efforts aiming for children to lower the loudness of their voices was conducted. These were performed with a demonstration of proper voice levels with animals of different scales and the generation of a music box sound during lunch. The effects of these trials were physically analyzed by sound recordings and subjectively evaluated by nurses.
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Norihisa HASHIMOTO, Nobuyuki ABE
2018 Volume 24 Issue 56 Pages
237-242
Published: 2018
Released on J-STAGE: February 20, 2018
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A questionnaire survey on the children playing noise in nursery schools was carried out as a target for general citizens in Tokyo and the other prefectures. The survey collection rate is 17.7 % and the number of questionnaires collected is 341. The results show that a rate of the persons opposing the construction of nursery schools is about 10 %, and the reason of opposition for the construction is only feeling of an anxiety for the children playing noise. If the anxiety can be then dispelled, it is possible to resolve this problem.
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Shigeo KOBAYASHI, Hirotsugu YAMADA
2018 Volume 24 Issue 56 Pages
243-246
Published: 2018
Released on J-STAGE: February 20, 2018
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This project suggested incorporating lighting into a lattice installed on the outer wall of a detached house. Because the light resembled light leaking from inside of the house, it was expected to improve the walkability, landscape lighting and crime prevention of the street. First, a lattice mockup was created and various lighting methods were examined. Next, simulation images of the night residential area were prepared and the psychological effects on the streets were evaluated. Based on the experimental results, this lighting method was applied to actual new distribution sites, and it was confirmed that the expected effects could be achieved sufficiently.
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– Study on method to evaluate thermal performance of an envelope including phase change material Part 1 –
Mao SERIKAWA, Yosuke HORIUCHI, Youngjin CHOI, Makoto SATOH, Masayuki M ...
2018 Volume 24 Issue 56 Pages
247-252
Published: 2018
Released on J-STAGE: February 20, 2018
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The thermal performance of Phase Change Material (PCM) is generally evaluated by itself. This paper aims to evaluate actual building envelopes including PCM, inputting interior and exterior thermal changes from an innovative experimental apparatus to both sides of the envelope. We conducted parametric study on PCM, interior surface and insulation, and evaluated the impact of these parameters on PCM performance.
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Keiko MURO
2018 Volume 24 Issue 56 Pages
253-258
Published: 2018
Released on J-STAGE: February 20, 2018
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Since adjusting the amounts of clothing worn within the home is an effective way to cope with increasing or decreasing temperatures, we conducted questionnaire surveys in summer and winter in order to gain an understanding of how heating and cooling equipment are used as well seasonally, as well as how the amount of clothes worn changes with indoor climate conditions. The results show the following points: (1) there were differences in preferred air-conditioning temperature settings among age groups, (2) clothing amounts worn within the home differ for males and females, and (3) the amount of clothing worn affects air conditioner usage.
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Yuichiro AMANO, Katsuya NAKAGAWA, Masaki TAJIMA, Kengo HORIOKA, Tsuyos ...
2018 Volume 24 Issue 56 Pages
259-263
Published: 2018
Released on J-STAGE: February 20, 2018
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In this paper, analysing result of indoor environment and air conditioning load properties based on real measurements to contribute capacity design of the air conditioner obtained in important equipment rooms is shown. As an analysing result, it is clarified that the grasping the amount of the heat generation is necessary for designing of air conditioning load even in the important equipment rooms. Therefore, data of important equipments’ heat generation obtained by real measurement are organised and shown.
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Hideki TANAKA, Kazuhisa TSUNEKAWA, Masaya OKUMIYA
2018 Volume 24 Issue 56 Pages
265-269
Published: 2018
Released on J-STAGE: February 20, 2018
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This paper discusses about an examination of an energy management method for multi-sprit type air conditioner using centralized controller with a function of gas rate proportional division. The objective system is a gas engine heat pump air-conditioner installed in an agricultural research building. For energy conservation of multi-sprit type air conditioning system, comprehension of focal points in measures and identify on priority target rooms were carried out by analysis of factors which contribute to heating and cooling energy consumption using actual data. In addition, examples of an analysis method for the operating situation and estimating performance of air conditioner were specifically shown.
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Yoshitami NONOMURA, Ichiro FUJITA
2018 Volume 24 Issue 56 Pages
271-274
Published: 2018
Released on J-STAGE: February 20, 2018
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The current study was conducted as a response to the need for clarifies the influence that Rokko Mountains give to the water depth of the Toga River using information from the iRIC program and rainfall observation results during the local concentrated heavy rain.
The water depth using information from the iRIC program for only an urban area in Kobe city is the almost same as the rainfall observation results.
Our information results from iRIC program showed that rainwater infiltrated the ground of Rokko Mountains during the local torrential rain.
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– Study on improvement effects with a renewal of DHC system using river water heat –
Satoshi YAMAKAWA, Koshiro SAITO, Masazumi SHIMO, Masashi KAWANO, Kimiy ...
2018 Volume 24 Issue 56 Pages
275-280
Published: 2018
Released on J-STAGE: February 20, 2018
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In 1989, district heating and cooling system using river water heat was introduced for the first time in Japan, at Hakozaki. And this system was improved with a renewal in 2012~2014. It was improved the washing method of the heat pump tube and the control method of river water intake. This paper presents a study on improvement effects with a renewal of DHC system using river water heat.
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Satomi TSUNOO, Hideto KIYOSE, Hiroto TAKAGUCHI
2018 Volume 24 Issue 56 Pages
281-284
Published: 2018
Released on J-STAGE: February 20, 2018
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Recently, the number of renovation with external thermal insulation for energy-saving has been increasing. This report shows four experimental studies on external thermal insulation system for apartment houses. First, based on noncombustible certification test, it was found that the system was composed of noncombustible materials. Second, as the result of test for tensile strength, the system turned out to have the durability to wind load and strain. Finally, strain test and exposure test were carried out. The result showed that strain was within the permissible range in the system through changes of temperatures and weather conditions.
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