-
Article type: Cover
2002 Volume 67 Issue 553 Pages
Cover9-
Published: March 30, 2002
Released on J-STAGE: February 04, 2017
JOURNAL
FREE ACCESS
-
Article type: Cover
2002 Volume 67 Issue 553 Pages
Cover10-
Published: March 30, 2002
Released on J-STAGE: February 04, 2017
JOURNAL
FREE ACCESS
-
Article type: Appendix
2002 Volume 67 Issue 553 Pages
App13-
Published: March 30, 2002
Released on J-STAGE: February 04, 2017
JOURNAL
FREE ACCESS
-
Article type: Appendix
2002 Volume 67 Issue 553 Pages
App14-
Published: March 30, 2002
Released on J-STAGE: February 04, 2017
JOURNAL
FREE ACCESS
-
Article type: Appendix
2002 Volume 67 Issue 553 Pages
App15-
Published: March 30, 2002
Released on J-STAGE: February 04, 2017
JOURNAL
FREE ACCESS
-
Article type: Appendix
2002 Volume 67 Issue 553 Pages
App16-
Published: March 30, 2002
Released on J-STAGE: February 04, 2017
JOURNAL
FREE ACCESS
-
Article type: Appendix
2002 Volume 67 Issue 553 Pages
App17-
Published: March 30, 2002
Released on J-STAGE: February 04, 2017
JOURNAL
FREE ACCESS
-
Masaharu OHASHI, Hiroshi TAMURA
Article type: Article
2002 Volume 67 Issue 553 Pages
1-6
Published: March 30, 2002
Released on J-STAGE: February 04, 2017
JOURNAL
FREE ACCESS
Studies on test methods of water absorption and density of crushed stone fines as additives for concrete were carried out, and the following two findings were obtained. 1.The percentage of absorbed water of the crushed stone fines in the moisture-saturated condition is available as an index of the effective water in a concrete mixture using the fines. 2.The Le Chatelier flask conformed to JIS R 520L is suitable for measuring the density of the crushed stone fines as an additive for concrete.
View full abstract
-
Ken-ichi ICHISE, Hironori NIWA, Kakuhiro NAGAO
Article type: Article
2002 Volume 67 Issue 553 Pages
7-12
Published: March 30, 2002
Released on J-STAGE: February 04, 2017
JOURNAL
FREE ACCESS
A reinforced concrete column restrained by a steel plate and reinforced concrete column using high strength concrete (real strength 100N/mm^2) have been studied experimentally to determine heat and moisture migration in a reinforced concrete column during a fire. This report describes the fire endurance, and shows a measurement result considering temperature distribution, hydrate distribution and vapor pressure inside the reinforced concrete column. The following conclusions were obtained. (1)The reinforced concrete column restrained by a steel plate prevented the explosion of concrete and the inner concrete and reinforced steel bar temperature rise was restrained. In the fully cured high strength reinforced concrete column of 100N/mm^2 class, an explosion was eased. (2)The temperature distribution, hydrate distribution and vapor pressure inside the reinforced concrete column subjected to fire heating was determined for the most part.
View full abstract
-
Haruka OGAWA, Yoshihiko OHAMA, Katsunori DEMURA
Article type: Article
2002 Volume 67 Issue 553 Pages
13-18
Published: March 30, 2002
Released on J-STAGE: February 04, 2017
JOURNAL
FREE ACCESS
Conventional epoxy-modified mortar and concrete pose certain problems of cost-performance balance due to the necessity of mixing two components (epoxy resin and hardener) and high polymer-cement ratios of 50% or higher. In addition, the working life of the mixture is limited. This paper experimentally investigates the fundamental properties of a new epoxy-modified mortar which uses a working-life-free, one-component epoxy resin. This one-component epoxy resin contains a microcapsuled curing agent which does not react with the resin at normal temperature and starts a chain reaction at 80℃ or more. The flexural strength and ductility of the epoxy-modified mortars with this system are superior to those of the unmodified mortars mixed in the same proportions. Furthermore, water absorption and drying shrinkage are markedly decreased with this system.
View full abstract
-
Nobuto HIRATA, Norimoto KASHINO, Takashi TOMIITA
Article type: Article
2002 Volume 67 Issue 553 Pages
19-25
Published: March 30, 2002
Released on J-STAGE: February 04, 2017
JOURNAL
FREE ACCESS
To evaluate the weatherability and contamination proof of decorative paints for buildings, six white specimens composed of various base resins were exposed under sub-frigid, temperate and sub-tropical areas in Japan for four years. Gloss retention, an index of durability, increased and was expressed by synergism of climate factors. Lightness assuming to be almost constant could be explained by repeated staining by the air pollutants and washing by rainfall. The authors proposed a concept to refer the database of Suspended Particulate Matter (SPM) provided by National Institute for Environmental Studies.
View full abstract
-
Arihide NOBATA, Saburoh MIDORIKAWA
Article type: Article
2002 Volume 67 Issue 553 Pages
27-32
Published: March 30, 2002
Released on J-STAGE: February 04, 2017
JOURNAL
FREE ACCESS
Evaluation of near-field ground motion is one of the most important issues in the seismic design. In this study, the ground motion intensity of the 1948 Fukui earthquake which is one of the most disastrous in-land shallow earthquakes is investigated, in order to make a better understanding of the characteristic of the near-field ground motion. First, the fragility curve of collapse of wooden houses is built based on the intensity of ground motion estimated from the damage data and the re-evaluated collapse rate of houses. And, the distribution map of ground motion intensity during the 1948 Fukui earthquake is obtained by using this fragility curve. As the result, the estimated peak ground velocity is more than 120cm/s in the central Fukui plane, and partially it exceeds 200cm/s.
View full abstract
-
Toshiro MAEDA, Fumio SASAKI, Yoshifumi YAMAMOTO
Article type: Article
2002 Volume 67 Issue 553 Pages
33-40
Published: March 30, 2002
Released on J-STAGE: February 04, 2017
JOURNAL
FREE ACCESS
We have proposed a new method of constructing artificial ground motion with non-stationarity, which is necessary to evaluate the frequency selective resonance of non-linear structures. The wavelet transform with the Sine wavelet is used to decompose signal into band-limited wavelets with temporal shifts, thus expressing the non-stationarity. Squared wavelet coefficients are modeled by the normal distribution along time axis, with the acceleration power, the temporal centroid, and the temporal variance evaluated for magnitudes and epicentral distances. Artificial ground motion is generated by the inverse wavelet transform to show the non-stationarity inferred from wave propagation and statistically anticipated attenuation relations.
View full abstract
-
Hideaki SAITO, Hideo TANAKA, Tomoaki ISHIDA, Kohji KOYAMADA, Osamu KON ...
Article type: Article
2002 Volume 67 Issue 553 Pages
41-48
Published: March 30, 2002
Released on J-STAGE: February 04, 2017
JOURNAL
FREE ACCESS
Vibration tests of a pile-supported structure in a liquefiable sand deposit have been conducted at a large-scale mining site. A simple pile-supported structure was constructed in an excavated 3m-deep pit that was backfilled with saturated sands. Ground motions from large-scale blasting operations were used as excitation forces for vibration tests. Accelerations were measured at the pile-supported structure, in the test pit and in an adjacent free field. Excess pore water pressures in the test pit and pile stresses were also measured. As the level of the input motions increased, structure responses and pile bending moments were remarkably changed by pore water pressure buildup. It is thus clarified that this vibration test method was very effective to verify the soil non-linearity including the liquefaction and the dynamic behavior of the pile-supported structure.
View full abstract
-
Takashi YAMANE, Sumio NAGAHASHI
Article type: Article
2002 Volume 67 Issue 553 Pages
49-56
Published: March 30, 2002
Released on J-STAGE: February 04, 2017
JOURNAL
FREE ACCESS
The purpose of this paper is to demonstrate that the theoretical background of the similarity between the distribution of phase differences and the shape of the wave envelope can be clearly explained by using the concept of beat. The validity of this idea is verified by analyzing recorded earthquake motions. This idea, moreover, derives two significant results, that a wave with uniform phase differences becomes a pulse independently of Fourier amplitude, and that the position of the pulse on the time axis and the pulse type can be specified by the parameters of the phase difference and the initial phase angle. Comparing response spectra of two waves with identical Fourier amplitudes, it is illustrated that the response spectrum depends on Fourier phase as well as Fourier amplitude.
View full abstract
-
Kohji TOKIMATSU, Hiroko SUZUKI, Yasutsugu SUZUKI, Shunji FUJII
Article type: Article
2002 Volume 67 Issue 553 Pages
57-64
Published: March 30, 2002
Released on J-STAGE: February 04, 2017
JOURNAL
FREE ACCESS
The lateral subgrade reaction of pile during soil liquefaction is back-calculated based on shaking table tests. It is correlated with relative displacement between soil and pile irrespective of soil density before liquefaction, but with relative velocity for loose sands and with relative displacement for medium to dense sands after liquefaction. The difference in behavior of subgrade reaction between sands with different densities after liquefaction is characterized by the difference in their dilatancy characteristics. The coefficient of subgrade reaction decreases with increasing excess pore pressure and relative displacement, and this trend becomes pronounced with decreasing initial confining pressure and soil density.
View full abstract
-
Toshiyuki OGAWA, Shiro KATO, Mayuko HAGIHARA, Rie TATEISHI
Article type: Article
2002 Volume 67 Issue 553 Pages
65-72
Published: March 30, 2002
Released on J-STAGE: February 04, 2017
JOURNAL
FREE ACCESS
The purpose of the paper is to discuss the buckling behavior of rigidly jointed shallow HP (hyperbolic paraboloidal) . Lattice shell under uniform lateral loading and to propose a concept of column buckling strength by. Which the buckling loads are effectively expressed. First, a series of eigenvalue analysis is carried out to obtain the linear buckling loads depending on the several parameters, based on which a generalized slenderness is defined for column buckling curve, then followed by both the elastic and the elasto-plastic buckling analysis to find the magnitude of the knock down factor and the column strength for HP lattice. Finally the initial yield load and the ultimate load are expressed in terms of column buckling strength, and the concept is applied to estimate the initial yield load and the ultimate load based of HP lattice shells.
View full abstract
-
Youichi MINAKAWA
Article type: Article
2002 Volume 67 Issue 553 Pages
73-80
Published: March 30, 2002
Released on J-STAGE: February 04, 2017
JOURNAL
FREE ACCESS
A new constitutive law of coated-fabric membrane is proposed, where the effects of dimple shape of neutral surface caused by crimp interchange of yarns are taken in consideration. Nobody has taken into account of the effect on the neutral surface of the membrane. Hyperbolic functions are adopted to express stress-strain relation of each yarn. After, determining two models, stress-strain curves under several stress ratios corresponding to warp and filling directions are shown, which simulate these obtained by experiment with high precision.
View full abstract
-
Miyuki OHMIYA, Yasuhito MATSUURA, Keiichi KATORI, Shizuo HAYASHI
Article type: Article
2002 Volume 67 Issue 553 Pages
81-88
Published: March 30, 2002
Released on J-STAGE: February 04, 2017
JOURNAL
FREE ACCESS
The conventional shear strength formula of the column with wing walls does not take account of the shear failure mode and the effect of a transvers reinforcement bar of a column and walls appropriately. In this paper, first, the authors carried out the experiment in the column with wing walls and investigated the effect of the reinforcement bars on the shear failure and strength. Second, we presented a new shear strength formula considering shear failure modes. In this formula, the effective factor of compressive strength of concrete, ν, is taken account of the effect of the reinforcement bars and an axial force. In the case the sliding shear failure occurred, ν is reduced. The calculated value by that has good accordance with the test values.
View full abstract
-
Miyuki KASAHARA, Yasuhiro MATSUZAKI, Katsuhiko NAKANO
Article type: Article
2002 Volume 67 Issue 553 Pages
89-95
Published: March 30, 2002
Released on J-STAGE: February 04, 2017
JOURNAL
FREE ACCESS
High performance fiber reinforced cementitious composites (HPFRCC), mixed short polyvinyl Alcohol fiber into mortar, have been realized with reaching about one percent of tensile strain. In this paper the results of the experiment of the beams and columns using HPFRCC are described. As the result of the experiment, the structural performance of the beams and columns using HPFRCC is better than that of those using reinforced-concrete (RC). Then, evaluation method of the structural performance (bending strength, shear strength, bond strength) of the beam and column using HPFRCC is proposed.
View full abstract
-
Yukihiro HARADA, Sung Min JUNG, Koji MORITA
Article type: Article
2002 Volume 67 Issue 553 Pages
97-104
Published: March 30, 2002
Released on J-STAGE: February 04, 2017
JOURNAL
FREE ACCESS
Many damaged steel buildings were repaired after Northridge earthquake in 1994 and Hyogoken-Nanbu earthquake in 1995, but the efficiency of the repair for beam-to-column connection has not been examined sufficiently. The purpose of the present study is to experimentally investigate the efficiency of the repair and modification for beam-to-column connection of steel buildings. Subassemblage specimens for this experimental study is prepared by repairing damaged subassemblage specimens which is obtained by previous experimental study. In this study, the maximum strength of the connections in repaired or modified subassemblage specimens are estimated, with indicating resisting mechanism in the connections.
View full abstract
-
Yoshikazu TANUMA, Hideo KOBAYASHI
Article type: Article
2002 Volume 67 Issue 553 Pages
105-112
Published: March 30, 2002
Released on J-STAGE: February 04, 2017
JOURNAL
FREE ACCESS
Considering steel buildings under seismic loads, fatigue tests of notched round bars of a high strength steel are carried out to investigate characteristics of ultra-low-cycle-fatigue crack growth that may occur under large scale yielding in which plastic deformations are dominant. The relationship between the crack growth characteristics, the cyclic R curve and the static R curve is discussed. The final fracture occurs by plastic collapse. A method of crack growth analysis and life prediction is proposed to evaluate the structural integrity of buildings in addition to the normal plastic limit design.
View full abstract
-
Sang-Hobn OH, Satoshi YAMADA, Hiroshi AKIYAMA, Fumio OTAKE, Koji FUKUD ...
Article type: Article
2002 Volume 67 Issue 553 Pages
113-120
Published: March 30, 2002
Released on J-STAGE: February 04, 2017
JOURNAL
FREE ACCESS
The flexible-stiff mixed structure, where the main frame is used as a flexible element and the earthquake input energy is mainly absorbed by energy absorption element, is suggested to enable an effective earthquake resistant design. In order to achieve such flexible-stiff mixed structure, a connection with a slit-type steel plate damper installed at each ends of wide-flange section beam, as an energy absorption element, was proposed through this research. A series of experiment was carried out to evaluate their structural performance and behavior. The main parameter of 'experiment was the aspect ratio of the struts in slit plates. Experimental results indicates that most of the energy was absorbed by plastic deformation of slit plate dampers. Additionally, the behavior of such type of connection can be expressed into the sum of the behavior of non-diaphragm connection, where only the web of beam is welded to the column, with that of the slit plate damper.
View full abstract
-
Satoshi YAMADA, Michio YAMAGUCHI, Yuri TAKEUCHI, Toru TAKEUCHI, Akira ...
Article type: Article
2002 Volume 67 Issue 553 Pages
121-128
Published: March 30, 2002
Released on J-STAGE: February 04, 2017
JOURNAL
FREE ACCESS
In this paper, the strain rate dependency of low yield strength steel is discussed. Concerning seismic members, the hysteretic steel dampers are generally the most used. Low yield strength steel has been developed and used as yielding steel core of buckling resisting braces. One well-known feature of the low yield strength steel is the strain rate dependency, however, only few studies about their dependency were published. In this study, the dynamic behavior of a low yield strength steel is divided into a component depending on displacement between a component depending on strain rate. Through the dynamic and hysteretic loading test, each component is evaluated. At last, hysteresis characteristic considering strain rate dependence is modeled.
View full abstract
-
Keigo TSUDA
Article type: Article
2002 Volume 67 Issue 553 Pages
129-134
Published: March 30, 2002
Released on J-STAGE: February 04, 2017
JOURNAL
FREE ACCESS
A formula for evaluating an effective length factor of column in braced symmetrical frame is proposed. An equation for an effective length of column is obtained by using the energy method. It is shown that the effective length obtained by proposed formula agrees well with the correct value. Moreover, an example is given and compared to precise results obtained by "Guide to the Plastic Design of Steel Structures".
View full abstract
-
Ryoichi KANNO
Article type: Article
2002 Volume 67 Issue 553 Pages
135-142
Published: March 30, 2002
Released on J-STAGE: February 04, 2017
JOURNAL
FREE ACCESS
This paper is the first of two companion papers on strength evaluation for RCS joints consisting of steel beams and reinforced concrete columns. Especially for those categorized as through-beam type, the accuracy of the existing design equations proposed in Japan and the US was studied in detail by comparing with database collected from existing literature. It was shown that strength equations proposed in the ASCE Guidelines provided the most accurate and consistent strength estimates, whereas some Japanese design equations often overestimated the joint strengths for some specific joint details. Based on information obtained through the comparison and existing knowledge, a new strength model was further proposed and outlined in this paper for future improvement of the RCS joint design.
View full abstract
-
Jun-ichi SUZUKI, Takahiro ISHIHARA, Makoto SHIMAMURA, Yoshifumi OHMIYA ...
Article type: Article
2002 Volume 67 Issue 553 Pages
143-148
Published: March 30, 2002
Released on J-STAGE: February 04, 2017
JOURNAL
FREE ACCESS
A simple formula has been developed to calculate the temperature rise of unprotected steel elements during fire. The formula includes the effect of steel heat capacity through section factor H_S/A_S, where H_s is the heated perimeter length of cross section, A_s is the cross sectional area. To derive the formula, a series of fire resistance tests were conducted for H-sectioned columns, box columns and H-sectioned beams of various cross section sizes. The measured steel temperature histories were fitted with exponential curves to obtain the steel temperature rise coefficient (inverse of time constants of temperature rise). Good correlation was obtained between the section factors and the steel temperature rise coefficients for respective categories of steel shapes.
View full abstract
-
Article type: Appendix
2002 Volume 67 Issue 553 Pages
App18-
Published: March 30, 2002
Released on J-STAGE: February 04, 2017
JOURNAL
FREE ACCESS
-
Article type: Cover
2002 Volume 67 Issue 553 Pages
Cover11-
Published: March 30, 2002
Released on J-STAGE: February 04, 2017
JOURNAL
FREE ACCESS
-
Article type: Cover
2002 Volume 67 Issue 553 Pages
Cover12-
Published: March 30, 2002
Released on J-STAGE: February 04, 2017
JOURNAL
FREE ACCESS
