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Article type: Cover
1992Volume 433 Pages
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Published: March 30, 1992
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Article type: Cover
1992Volume 433 Pages
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Published: March 30, 1992
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Article type: Index
1992Volume 433 Pages
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Published: March 30, 1992
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Article type: Index
1992Volume 433 Pages
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Published: March 30, 1992
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Article type: Index
1992Volume 433 Pages
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Published: March 30, 1992
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Yoshihiro MASUDA, Kenji HARA, Yuji MATSUBAYASHI, Hitoshi TANAKA, Kenji ...
Article type: Article
1992Volume 433 Pages
1-10
Published: March 30, 1992
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This paper reports the accelerated test results on the protective effects on corrosion of reinforcing bar in salt containing concrete by surface coating materials and barrier penetrants. Three kinds of surface coating material for thick textured finishes, one kind of surface coating material for thin textured finishes, two kinds of paint, three kinds of barrier penetrant and three kinds of polymer cement mortar were examined. All materials used in this experiment, especially two kinds of barrier penetrant, have the protective effect on corrosion when the concrete cover is 15 mm and the salt content is 0.3 %/ sand.
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Yoshihiro TSUJIMOTO, Nobukazu OHBA, Tetsuya SUDOH
Article type: Article
1992Volume 433 Pages
11-17
Published: March 30, 1992
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We performed a series of studies to designate the algae which is the main factor of these soiling, and to establish methods which can evaluate materials in regard to soiling of external walls. The following results became clear after this investigation. Soiling of external walls is usually caused by the fresh-water algae named Protococcus Viridis Agardh. We can evaluate the degree of growth of algae on the external materials by applying two independent tests, one is outdoor ex-porsure test and the other one is indoor accelerated test in which we diviced techniques for supplying moisture, nutriment and algae to samples.
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Akira SAKAI, Ichiroh KURIHARA, Ichiro SHIRAISHI, Yoshiro NAKAMURA
Article type: Article
1992Volume 433 Pages
19-28
Published: March 30, 1992
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Mechanic and response characteristics of three dimensional reinforced concrete shear walls under the earthquakes are studied through static tests and pseudo dynamic tests performed on the walls in the shapes of a box and a cylinder. In behavior of the walls after the ultimate strength, the box walls shows brittleness while the cylinder walls shows much of toughness. The load-deformation relationship and the principal strain distribution in the 3-D nonlinear FEM analysis agree well with the test results. It is confirmed in the pseudo dynamic tests that wall shapes and input seismic waves have influences on the response behaviors while they have no influence on the equivalent velocities V_E, up to the ultimate strength, which remain almost constant.
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Satoshi ECHIZENYA
Article type: Article
1992Volume 433 Pages
29-37
Published: March 30, 1992
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In the case where the lap splice is placed at point of maximum peak bending moment, such as an inner support of continuous slab, if the lapped length of the splice is adequately long, the strength of the splice near the center of the lapped part becomes as large as the strength of double bars, so that economical bar placing might be allowed by use of such splice. The experiments show that the lap splice having anchor length for both sides from the center of splice, in which anchor length is computed based on the yield stress of the bar and the allowable bond stress recommended by R. C, code of A. I.J., exibits nearly equal strength and rigidity to that the continuous double bars have, even though the lap splice is placed in unfavourable condition that is the splice is cast in top bar position and lateral bars are placed below. the splice.
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Kazuhide KUTANI, Kanshi MASUDA
Article type: Article
1992Volume 433 Pages
39-49
Published: March 30, 1992
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Generally, the superposed strength is found by the graphical solution. In this paper, it has been definitely shown that the superposed strength is the sum of position vectors on those points of contact as interaction curves of the steel and the concrete have tangent lines which are parallel to each other. And, the superposed strength formula has been theoretically derived to predict the ultimate strength of the exposed type of steel column bases. From the results carried out the eccentrically applied load tests and the lateral load tests under constant axial forces, it has been definitely shown that the superposed strength formula is able to accurately predict the ultimate strength of the exposed type of steel column bases by using the empirical formula of the bearing strength of footings proposed by authors.
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Junichi KIMURA, Masanobu TOMODA, Chiaki MATSUI, Shosuke MORINO
Article type: Article
1992Volume 433 Pages
51-60
Published: March 30, 1992
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Based on the results of the parametric analysis of the elasto-plastic behavior of model steel subassemblages, a simple formula is derived which estimates the stability limit strength of a certain story of a multistory steel frame from the elastic response line and the rigid plastic mechanism line without tedious computation of the buckling strength. The strengths given by the formula are compared with the results of the parametric analysis and the results of the past experiments, and the accuracy of the formula is examined. In addition, the relations between the present formula and ones proposed previously by others are investigated.
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Koji OGAWA, Yoshiaki KUROBANE, Minoru YAMANARI
Article type: Article
1992Volume 433 Pages
61-71
Published: March 30, 1992
Released on J-STAGE: December 25, 2017
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Results of a series of tests on complete tubular trusses that showed diverse failure modes including buckling of members are summarized. The behavior of tube-to-tube joints in the trusses is discussed. Failures of joints were observed at loads close to the predicted joint capacities according to the formulas developed for the K-joint under axial brace loading. However, after buckling of members, the K-joints come under combined axial and bending loads and fail at a load lower than the joint capacity prediced by the formulas. Since the resistance of joints deteriorates due to combined load effects, joints should be designed to have a greater capacity than the buckling capacity of the members.
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Jun KANDA, Kiyoshi ISHII, Yuji OHASHI, Mitsugu ASANO, Masanori IZUMI, ...
Article type: Article
1992Volume 433 Pages
73-81
Published: March 30, 1992
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For these two decades the concept of safety and reliability has been introduced into various fields of civil engineering. Under this circumstance, structural,engineers are required to have basic knowledge about a reliability- or probability-based design philosophy. Opinion survey was conducted for the purpose of understanding how practising engineers currently think about the idea of safety and reliability, probability-based design methodologies, disaster, insurance, and loads for structural design. Some remarks are derived from the results obtained by this survey.
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Nobuo FUKUWA, Hiroshi KATUKURA, Shoichi NAKAI
Article type: Article
1992Volume 433 Pages
83-90
Published: March 30, 1992
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The wave propagation in the analysis of the discrete method such as finite element method is examined for one dimensional structure. The transfer matrix method is adopted and the phase velocity, group velocity and equivalent damping ratio are explicitly solved from the eigenvalue of transfer matrix. From this examination, it is clarified that the propagating waves show the dispersion even if the continuum body is analyzed. In order to improve the wave propagation property, the optimal consistent mass ratios are derived, which give the same phase velocity or group velocity as those of the rigorous solution.
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Ki KOH, Koichi TAKANASHI
Article type: Article
1992Volume 433 Pages
91-101
Published: March 30, 1992
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The main objectives of this study are to investigate the effects of random variability in steel yield stress and strain hardening modulus on energy response of structures under earthquake loading. Up to now, all of studies concerning the effects of random variability in material property on dynamic response are based on methodology of a Monte Carlo simulation. This paper describes the analytical method to estimate the statistics of energy response for hysteretic structures consisted of uncertainty materials.
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Motohide TADA
Article type: Article
1992Volume 433 Pages
103-112
Published: March 30, 1992
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Some imperfections during the construction, such as the error of the member length or of the setting level of the supports, may cause the reduction of the ultimate load carrying capacity of the ordinal double-layer space truss. But, by incorporating force limiting devices, which would yield under a predetermined axial member-force, into the truss, the constant load carrying capacity can be obtained. This paper deals with the procedure of the combined nonlinear analysis using the strain hardening general yield hinge model and the incremental perturbation technique. And above concept is evaluated by the numerical analysis.
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Yasuhiro SHAMOTO, Kohji TOKIMATSU, Kouzo ARIIZUMI
Article type: Article
1992Volume 433 Pages
113-119
Published: March 30, 1992
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An effective stress analysis procedure is proposed for simulating dynamic response of a soil deposit involving soil liquefaction and cyclic mobility. The analysis is coupled with an effective stress model which can define stress-strain relationship of liquefiable sand with a limited number of parameters. The effectiveness of the proposed analysis is studied using the accelerations and pore pressures which were recorded in a soil deposit during six earthquakes. The analytical results including time histories of acceleration and pore pressure and Fourier acceleration spectra are in good agreement with the observed values, indicating that the proposed analysis is effective.
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Yuji MIYAMOTO, Kiyoshi MASUDA
Article type: Article
1992Volume 433 Pages
121-130
Published: March 30, 1992
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It is necessary to clarify dynamic characteristics of a pile group foundation for evaluating earthquake response of a structure supported on piles. Forced vibration tests of two full scale foundations are conducted to investigate dynamic characteristics of a pile group foundation, one of which has fifty-six piles and the other has a basement on eighty-four piles. Dynamic impedance functions calculated from the test results are discussed and compared with the analysis results based on the 3-D thin layer element method. It is found that the analysis method gives good agreement with test results and can be applicable in practical design.
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Article type: Appendix
1992Volume 433 Pages
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Published: March 30, 1992
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Article type: Cover
1992Volume 433 Pages
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