-
Article type: Cover
1997 Volume 62 Issue 493 Pages
Cover9-
Published: March 30, 1997
Released on J-STAGE: February 02, 2017
JOURNAL
FREE ACCESS
-
Article type: Cover
1997 Volume 62 Issue 493 Pages
Cover10-
Published: March 30, 1997
Released on J-STAGE: February 02, 2017
JOURNAL
FREE ACCESS
-
Article type: Appendix
1997 Volume 62 Issue 493 Pages
App11-
Published: March 30, 1997
Released on J-STAGE: February 02, 2017
JOURNAL
FREE ACCESS
-
Article type: Appendix
1997 Volume 62 Issue 493 Pages
App12-
Published: March 30, 1997
Released on J-STAGE: February 02, 2017
JOURNAL
FREE ACCESS
-
Article type: Appendix
1997 Volume 62 Issue 493 Pages
App13-
Published: March 30, 1997
Released on J-STAGE: February 02, 2017
JOURNAL
FREE ACCESS
-
Article type: Appendix
1997 Volume 62 Issue 493 Pages
App14-
Published: March 30, 1997
Released on J-STAGE: February 02, 2017
JOURNAL
FREE ACCESS
-
Article type: Appendix
1997 Volume 62 Issue 493 Pages
App15-
Published: March 30, 1997
Released on J-STAGE: February 02, 2017
JOURNAL
FREE ACCESS
-
Kyoji TANAKA, Masahiro UCHIDA, Osamu OHMORI, Keesun BAE
Article type: Article
1997 Volume 62 Issue 493 Pages
1-7
Published: March 30, 1997
Released on J-STAGE: February 02, 2017
JOURNAL
FREE ACCESS
Effect of property of substrate concrete on blistering of floor coatings is studied from the two view points such as property of concrete itself and surface characteristics. The concrete specimens of various water cement ratios, on which floor coatings is applied, were exposed in the accelerated condition for reproducing blistering, and growth of blisters were observed for a few months. After the test, adhesive strength was measured and the concrete surface was observed through a microscope. It was found out that blistering is much influenced by the water flux property induced by semi-permeability of concrete, and the distribution of adhesive strength caused by exposed materials on surface such as cement paste, aggregates and laitance.
View full abstract
-
Jun SAKAMOTO, Yasuhiro MORI
Article type: Article
1997 Volume 62 Issue 493 Pages
9-15
Published: March 30, 1997
Released on J-STAGE: February 02, 2017
JOURNAL
FREE ACCESS
This paper presents a method to determine load models for use in limit state design based on basic variates (annual load intensity) and ranked variates (order statistics of the annual load intensity). Two classes of load models with different level of intensity and occurrence rate are proposed for use in ultimate limit state design and serviceability limit state design. The statistical characteristics of the load models and the application of the models to the evaluation of ultimate limit state probability and serviceability limit state probability are discussed using numerical examples with 1)the proposed load models and 2)50 year maximum load model.
View full abstract
-
Osamu TSUJITA, Hidesato NIWA, Takeshi OHKUMA, Akira WADA
Article type: Article
1997 Volume 62 Issue 493 Pages
17-22
Published: March 30, 1997
Released on J-STAGE: February 02, 2017
JOURNAL
FREE ACCESS
While stochastic methods to evaluate wind-induced response of elastic structures are well established, authors have previously proposed stochastic methods to predict wind-induced inelastic response. However, these stochastic methods for elastic and inelastic structures are based on a stationary random process with a fixed mean wind speed and do not consider the rapid variation of mean wind speed as shown in which a typhoon passes through a site. In this paper, inelastic response under wind loads with variation of mean wind speed is predicted by applying methods previously proposed in Ref. [1] and [2]. It is confirmed that proposed methods are also valid for wind loads with variation of mean wind speed by comparison with results of time history response analysis.
View full abstract
-
Yuji MIYAMOTO, Yuji SAKO, Kohji KOYAMADA, Kenji MIURA
Article type: Article
1997 Volume 62 Issue 493 Pages
23-30
Published: March 30, 1997
Released on J-STAGE: February 02, 2017
JOURNAL
FREE ACCESS
Pile foundation in the reclaimed soil were severely damaged during the Hyogo-ken Nanbu Earthquake, January 17, 1995. These damages were obviously attributed to nonlinear soil-pile foundation interaction. The objective of this study is to investigate the responses of a structure supported on a pile foundation in the liquefied soil deposit. Earthquake response analyses of structure on pile foundation are conducted using the numerical model that takes into account the effect of excess pore water pressure. The observed strong motion in the borehole array at the Port Island are employed as an input motion to the soil-pile foundation-structure system. It is found that structure responses are greatly affected by soil liquefaction, and that large pile bending moments are mainly caused by the kinematic interactions at the pile head and at GL-19m, the lower boundary of the reclaimed soil.
View full abstract
-
Toshimi SATOH, Tomiichi UETAKE, Yoshitsugu SUGAWARA
Article type: Article
1997 Volume 62 Issue 493 Pages
31-39
Published: March 30, 1997
Released on J-STAGE: February 02, 2017
JOURNAL
FREE ACCESS
We propose empirical envelope models of long period strong motion in a period range of 1 to 10 sec using many JMA 87 type records. We make models for five regions in Japan as a function of epicentral distance and site coefficients which represent site effects due to scattered waves or surface waves. Since the envelope is modeled by average and standard deviation of group delay time in narrow frequency bands, dispersion characteristics of surface waves can be simulated. We show the validity of our models by simulating records of the 1983 Nihonkai-chubu earthquake.
View full abstract
-
Toshihiro YAMAMOTO, Yoshinobu FUJITANI, Daiji FUJII
Article type: Article
1997 Volume 62 Issue 493 Pages
41-48
Published: March 30, 1997
Released on J-STAGE: February 02, 2017
JOURNAL
FREE ACCESS
In this paper, we investigate three characteristics of seismic response in the friction systems. First contents are base isolation systems containing mass on the base floor. We compare the response of these systems with one in the case of no mass on the base floor. Second contents are friction coefficients depended on the sliding velocity. We explain the method to simulate, and show response waves calculated using four kinds of these characteristics. Third contents are non-directional friction forces on the sliding plane surface. We propose one method to analyze the response of friction systems including those forces. In addition, we show the locus of ground motion and sliding motion using single or two mass model subjected to horizontal bi-axial earthquake.
View full abstract
-
Shuji TAMURA, Kohji TOKIMATSU
Article type: Article
1997 Volume 62 Issue 493 Pages
49-55
Published: March 30, 1997
Released on J-STAGE: February 02, 2017
JOURNAL
FREE ACCESS
A numerical method is presented for computing ground surface displacements induced by a buried vertical point source in a three-dimensional layered elastic half-space. On the basis of parametric studies, the effects of source depth on the contribution of Rayleigh and body waves to the ground displacement are examined for two-layered media. It is shown that, when the source is in the surface layer, Rayleigh waves always dominate, except when the contrast between two layers are high and the normalized frequency is close to one. If the source is in the base layer, on the contrary, body waves tend to dominate in the frequency range slightly less than cutoff frequencies of higher Rayleigh modes.
View full abstract
-
Atsushi ITO, Kunio YAMAGATA
Article type: Article
1997 Volume 62 Issue 493 Pages
57-64
Published: March 30, 1997
Released on J-STAGE: February 02, 2017
JOURNAL
FREE ACCESS
For the approximate method of computing the settlement on the surface of elastic layer with rigid base, Steinbrenner's approximate solution concerning uniformly distributed load and the method proposed in Recommendations for Design of Building Foundations concerning rigid spread foundation are in general use. But the appropriateness of these computing methods have been scarcely examined in design. Comparative examinations are performed with three-dimensional finite element method on the appropriateness of Steinbrenner's approximate solution and applicability to rigid spread foundation on single and double layers with rigid base. Furthermore proposed the correct coefficient and the limit of application of approximate method.
View full abstract
-
Yasutsugu SUZUKI, Kenji MIURA, Yoshiharu KIYOTA, Yoshitsugu SUGAWARA, ...
Article type: Article
1997 Volume 62 Issue 493 Pages
65-72
Published: March 30, 1997
Released on J-STAGE: February 02, 2017
JOURNAL
FREE ACCESS
A foundation work for reduction of earthquake response was proposed and the dynamic deformation characteristics of a high damping material employed in this foundation work were shown in previous papers (Part I and II). A mixture material of gravel and asphalt termed Asphalt Gravel was selected for the high damping material. Dynamic deformation tests and earthquake loading tests obtained in using large-scale specimens are presented in this paper. The test results indicated that the dynamic characteristics of Asphalt Gravel in earth-quake loading tests were nearly equal to those by dynamic deformation tests for sinusoidal input wave.
View full abstract
-
Fouad KHAIRALLAH, Yasuyuki ARAI
Article type: Article
1997 Volume 62 Issue 493 Pages
73-81
Published: March 30, 1997
Released on J-STAGE: February 02, 2017
JOURNAL
FREE ACCESS
This paper presents a numerical model for the prediction of 3-D characteristics of reinforced concrete L-shaped shear wall structures, under the combined action of bi-directional horizontal forces and an axial force. The proposed model is designed by considering the L-section as two orthogonal elements, which can be developed to study non-linear analysis of large structures with multiple elements. The model combines a perfectly elastic component with a plastic component. The perfectly elastic component is composed of two orthogonal separate walls, and the plastic component is composed of three plastic columns having inelastic springs at their ends. Also a simple method is established here to evaluate the flexibility coefficient along the whole height of the plastic columns.
View full abstract
-
Fumitoshi KUMAZAWA, Yoshiaki NAKANO, Tsuneo OKADA
Article type: Article
1997 Volume 62 Issue 493 Pages
83-90
Published: March 30, 1997
Released on J-STAGE: February 02, 2017
JOURNAL
FREE ACCESS
Recently, a size of scaled model specimens for structural tests tends to become larger and larger. A large scaled model test makes possible to obtain data similar to real structures. However, since it requires large size testing facilities and large amount of research funds, it makes difficult to execute parametric tests. In order to establish a testing technique using extremely small scaled models to investigate the seismic behavior of reinforced concrete structures, trials to fabricate 1/15 scaled reinforced concrete structures and to conduct shaking table tests were made. This paper describes the fabrication of the specimens and the response characteristics.
View full abstract
-
Koji YAMANOBE, Yoshitaka YABE, Akira WADA
Article type: Article
1997 Volume 62 Issue 493 Pages
91-98
Published: March 30, 1997
Released on J-STAGE: February 02, 2017
JOURNAL
FREE ACCESS
The structural behaviors of the long-spanned composite beams in steel frames are investigated. Three of 1/ 3-scale models of one-story and long-spanned steel frames with/without reinforced concrete slab were tested under lateral cyclic loading, while the composite beams were subjected to larger uniformly distributed vertical loads, up to 2.5 times the design loads. There was no significant influence of the vertical loads on the structural behavior of long-spanned structures. Such structures could not reach the failure mechanism even at a story drift angle of 1/50. The yield hinge theory for estimating the elasto-plastic behavior of the long-spanned composite beams, prior to the failure mechanism, underestimated the flexural stiffness in a positive region. This implies that the positive moment distribution must be taken into account for the total stiffness of the composite beams.
View full abstract
-
Akihiro KUSAKA, Masayoshi NAKASHIMA, Taijiro NONAKA
Article type: Article
1997 Volume 62 Issue 493 Pages
99-106
Published: March 30, 1997
Released on J-STAGE: February 02, 2017
JOURNAL
FREE ACCESS
Many modern steel frames sustained fracture at their beam-to-column connections in the 1994 US Northridge and 1995 Hyogoken-Nanbu Earthquakes. This paper presents a study on how such fracture would affect the behavior of frames. In the first part, a method to trace a static-path of steel frames involving beam fracture is introduced, and it is found that the first fracture often controls the maximum strength of frames. In the second part, proposed is a procedure to estimate the failure probability of steel frames. It is demonstrated that the key to make frames to reach the collapse mechanism without fracture is to reduce the variation of plastic rotation capacity.
View full abstract
-
Tetsuro ONO, Kazuto ISHIDA, Fumihisa YOSHIDA
Article type: Article
1997 Volume 62 Issue 493 Pages
107-114
Published: March 30, 1997
Released on J-STAGE: February 02, 2017
JOURNAL
FREE ACCESS
This paper describes an investigation of local buckling behavior and the local buckling zone of box-section stub-columns subjected to axial compression. In the stub-columns tests, the longitudinal strain of the column is concentrated in the local buckling zone and the strain is not widely distributed along the member axis. In this paper, a series of stub-columns tests is performed to clarify the local buckling behavior of the local buckling zone. The local buckling mode and the length of local buckling zone of the stub-column is measured in detail. Added to this, the theoretical stress-strain curves of stub-columns are derived by plastic hinge analysis. From the experimental and analytical investigation, the length of the local buckling zone of box-section stub-columns is twice as long as the half wave length of the local buckling mode. The deformation capacity of steel member must be estimated considering the local buckling zone.
View full abstract
-
Mitsumasa MIDORIKAWA, Takashi HASEGAWA, Akiyoshi MUKAI, Isao NISHIYAMA ...
Article type: Article
1997 Volume 62 Issue 493 Pages
115-120
Published: March 30, 1997
Released on J-STAGE: February 02, 2017
JOURNAL
FREE ACCESS
A field survey team investigated the damage to steel building structures that suffered from the 1995 Hyogoken-nanbu earthquake. The team investigated the damage to a total number of 628 steel buildings, located in the three specific areas of the city of Kobe, where many structures suffered significant damage, in order to find out the ratio of each damage level for all steel buildings in these areas. Among the investigated buildings, 109 were rated as Severe/Collapse, 90 as Moderate, 210 as Minor, and 208 as No damages. The results show that the ratio of the number of the buildings of Severe/Collapse damage, which were designed and constructed according to the current seismic provisions of the Building Standard Law of Japan, reduces to about one third of that according to the former ones.
View full abstract
-
Hitoshi KUWAMURA, Masakuni TAKETANI, Yuka MATSUMOTO
Article type: Article
1997 Volume 62 Issue 493 Pages
121-129
Published: March 30, 1997
Released on J-STAGE: February 02, 2017
JOURNAL
FREE ACCESS
It has long been criticized that the popularly used cold-formed box-section columns in building frames have not sufficient ductility in the local buckling behavior to resist a severe earthquake, because the steel material consumes its ample plastic strain capacity with a rise of yield ratio during the cold-forming process. However, recent development in steel manufacturing processes has established hot-rolled box-columns, in that process cold working is eliminated. Experimental investigation showed that the ductility of stub-columns governed by local buckling is larger in hot-rolled columns than in cold-rolled columns in a range of small width-to-thickness ratios, and consequently it was demonstrated by numerical analyses that hot-rolled columns provide larger plastic deformability under bending moment than cold-rolled columns in the range of small B/t ratios.
View full abstract
-
Hisato HOTTA, Hiroki KIHARA, Katsuki TAKIGUCHI
Article type: Article
1997 Volume 62 Issue 493 Pages
131-137
Published: March 30, 1997
Released on J-STAGE: February 02, 2017
JOURNAL
FREE ACCESS
This paper deals with shear strength concerning bond stress between steel and concrete in SRC members. A theoretical shear strength is led based on the upper bound theorem in plastic analysis, and assuming idealized deformation and failure surface in members. The proposed formula indicates that the shear strength depends on an axial load level, and its adequacy is confirmed empirically. Bond characteristic between steel plate and concrete is also investigated empirically, varying lateral confinement stress of the concrete. Finally the condition that such a brittle failure can be avoided is reconsidered using the knowledge obtained in the above experiments.
View full abstract
-
Michio SHIBATA
Article type: Article
1997 Volume 62 Issue 493 Pages
139-146
Published: March 30, 1997
Released on J-STAGE: February 02, 2017
JOURNAL
FREE ACCESS
A theoretical study is presented on the N-M interaction curve of a composite beam-column with arbitrary steel section. The deflection curve of a strut subjected to constant axial force and varying end moments is assumed as a half sine wave. The critical conditions for the maximum end moment are given explicitly. The governing equations are given in an analytical form for elastic perfectly-plastic composite columns, and obtained numerically for arbitrary constitutive relations. Computed results show good agreements with exact numerical solutions and experiments.
View full abstract
-
Goro SHIMIZU
Article type: Article
1997 Volume 62 Issue 493 Pages
147-154
Published: March 30, 1997
Released on J-STAGE: February 02, 2017
JOURNAL
FREE ACCESS
In 1979, a new concept of the self-growing sea structures such as artificial reefs, multifunctional OTEC plants and building components made of electrodeposited minerals in sea water was proposed through feasibility studies by Prof. Wolf H. Hilbertz, University of Texas. Based on the concept, this study started to have fundamental data for practical applications. In this paper, outline of electrodeposition process is reviewed and test results obtained under the different types of electric currents, i. E., constant, palse, sola-electric are compared and voltage for application are shown. Assessment of sea water is discussed with electric currents and water flow as parameters.
View full abstract
-
Article type: Cover
1997 Volume 62 Issue 493 Pages
Cover11-
Published: March 30, 1997
Released on J-STAGE: February 02, 2017
JOURNAL
FREE ACCESS
-
Article type: Cover
1997 Volume 62 Issue 493 Pages
Cover12-
Published: March 30, 1997
Released on J-STAGE: February 02, 2017
JOURNAL
FREE ACCESS
