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Article type: Cover
1991Volume 430 Pages
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Article type: Cover
1991Volume 430 Pages
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Article type: Appendix
1991Volume 430 Pages
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Article type: Appendix
1991Volume 430 Pages
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Article type: Appendix
1991Volume 430 Pages
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Article type: Index
1991Volume 430 Pages
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Article type: Index
1991Volume 430 Pages
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Article type: Index
1991Volume 430 Pages
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Katsuhiro KAMAE, Kojiro IRIKURA, Yasunaga FUKUCHI
Article type: Article
1991Volume 430 Pages
1-9
Published: December 30, 1991
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In order to predict more practically strong ground motion, it is important to study how to use a semi-empirical method in case of having no oppropriate observation records for actual small-events as empirical Green's functions. We propose a prediction procedure using artificially simulated small ground motions as substitute for the actual motions. First, we simulate small-event motion by means of stochastic simulation method proposed by Boore (1983) in considering pass effects such as attenuation, and broadening of waveform envelope empirically in the objective region. Finally, we attempt to predict the strong ground motion due to a future large earthquake (M7, Δ=13 km) using the same summation procedure as the empirical Green's function method. We obtained the results that the characteristics of the synthetic motion using M5 motion were in good agreement with those by the empirical Green's function method.
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Noriko KATAOKA, Takahide WATANABE
Article type: Article
1991Volume 430 Pages
11-17
Published: December 30, 1991
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A method for estimation of maximum velocity response to ground motions as a function of peak displacement and period of ground motion and some amount of information from seismograms is proposed and applied to some records. In this method, a displacement record is replaced by a harmonic motion and the velocity response is calculated from it. The way to get appropriate numbers of cycles of records is obtained. Studies on the number of cycles about the correlation with the site amplification characteristics and the frequency distribution are carried out. An attenuation relation for velocity response is obtained using a peak displacement attenuation function.
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Yoshinori MATSUMOTO, Koichiro YAMADA, Kenji UEJIMA
Article type: Article
1991Volume 430 Pages
19-29
Published: December 30, 1991
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Making a composite beam by attaching steel plates to a timber beam with metal connectors is a very effective method not only to strengthen the beam itself but also to prevent the rapid decrease of the beam strength due to material fracture. This paper deals with the elastic behavior of the timber beam reinforced with steel plates attached by metal connectors on the upper and lower side of the member. According to the theoretical research presented herein, the flexural rigidity of the reinforced timber beam varies along the length of the beam under various loading conditions and is represented by two parameters.
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Toshiro SUZUKI, Katsuki TAKIGUCHI, Hisato HOTTA, Toshio IGARASHI, Masa ...
Article type: Article
1991Volume 430 Pages
31-39
Published: December 30, 1991
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Steel-Hoop-Concrete composite (SHC) is a new structural system. This new system does not use the longitudinal bar. The object of this paper is to study shear force resisting behavior of SHC column. In other words, this paper aims to investigate the diagonal compression transfer mechanism of concrete divided by orthogonal steel plate. Fourteen SHC column specimens were made. Cyclic shear-bending tests were carried out under the constant axial force. Web plate of H-shaped steel was placed at right-angles to the direction of the shear force. Experimental parameters were cross section of steel, amount of hoop reinforcements, and thickness of cover concrete. The experimental results are well explained by clear mechanical models proposed in this paper.
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Fumio WATANABE, Kazumasa OHSUMI, Hiroshi MUGURUMA
Article type: Article
1991Volume 430 Pages
41-49
Published: December 30, 1991
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A new method to enhance the moment-curvature relations of reinforced concrete column sections in post-yield range of deformation was developed. The point of the idea is to introduce the sequential yielding of various grade longitudinal bars in a section. The section then does not show any significant reduction in load carrying capacity up to the yielding of highest grade bars. To confirm the advantages of the new method, flexural analyses and loading tests were carried out on reinforced concrete columns with various grade longitudinal bars. The results indicated the advantages of the combined use of various grade longitudinal bars.
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Kazuo SUZUKI, Hiroyuki NAKATA, Tadashi NAKATSUKA
Article type: Article
1991Volume 430 Pages
51-58
Published: December 30, 1991
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In this paper, two equations to estimate ultimate shear strength of circular reinforced concrete columns and bond strength of longitudinal reinforcement in the columns are derived. The first equation is composed of truss mechanism strength of transverse reinforcement and arch mechanism strength on concrete strut based on plastic theory. The second one is derived by using the ideas employed in similar equations, which are based on experimental studies, for members with rectangular sections. Compatibility of the two derived equations are examined by comparing calculated values with experimental ones obtained from previous experiments.
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Hagai SHIMOMURA, Takeshi SHINODA
Article type: Article
1991Volume 430 Pages
59-68
Published: December 30, 1991
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Delayed fracture tests with cathodically pre-charged specimens were performed measuring acoustic emission (AE). Experimental parameters were ratio of axial force to design bolt axial force, cathodically hydrogen charged time and effect of heat treatment. It was observed that time to fracture was somewhat affected by charged time and axial force ratio. Analytical process of diffusible hydrogen around a thread root and a tip of notch was compared with experimental one by AE signal and branching phenomenon near crack tip, and resulted in a good agreement.
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Masahiro KATO, Fumio OOTAKE, Hikaru SENDA, Kunio UKAI, Katsumi HARA
Article type: Article
1991Volume 430 Pages
69-77
Published: December 30, 1991
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At beam-to-column tension connections by high strength bolts, the yield and maximum local strength of column flange with and without reinforcing splice plates and stiffening plates are evaluated using the yield line theory. Eighteen specimens of the connections are tested under monotonic tensile loadings. The analytical yield and maximum strengths slightly overestimate the experimental general yield and maximum strengths respectively, but show a good correspondence with them.
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Tsuneyoshi NAKAMURA, Ikuo KOSAKA
Article type: Article
1991Volume 430 Pages
79-89
Published: December 30, 1991
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A method of earthquake-response constrained design of a plane frame for specified set of design strains is developed on the basis of the authors' design method for specified fundamental natural period and strain mode. The bending stiffness of each member with a specified depth is designed so that each SRSS member-end fibre strain would take on a specified value, The validity of the proposed method is demonstrated through the result of time history analysis on so-designed frames subjected to ten spectrum-compatible artificial earthquakes.
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Hideichi TSUJI, Haruo UOKI, Yoshihisa NAKAGAWA, Nobuhiro YAMAURA, Keii ...
Article type: Article
1991Volume 430 Pages
91-99
Published: December 30, 1991
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In order to grasp the present circumstances and problems of computer utilized structural calculation, we applied very small and simple building models we call 'benchmark structures' to various structural computative programs actually used in various companies. Subsequently we studied the difference among their calculated results quantitatively and investigated the reason of each numerical difference. Our studies for the primary design have been reported in the previous paper, so this paper describes the studies for the calculation of horizontal load-carrying capacity and structural characteristics factor (D_s) in the secondary design. Here we also comfirmed conspicuous difference among the calculated results.
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Kazuo DAN
Article type: Article
1991Volume 430 Pages
101-104
Published: December 30, 1991
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While the seismic body waves and surface waves were calculated separately in your paper, it is possible to treat them as the body-wave source spectra which propagate in the infinite medium just after they radiate from the source. The studies on the source spectra show that your correction for the seismic moment does not correspond to the correction for the fault area as you insisted but that it is the correction for the dislocation. Your results, therefore, were based on the unrealistic dislocations such as several hundred meters or 24 to 118 meters.
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Yoshikazu KITAGAWA, Takahito INOUE, Toshio NISHIDE
Article type: Article
1991Volume 430 Pages
105-
Published: December 30, 1991
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The ground motion due to earthquake occurrence in strongly affected by the earthquake process itself, the propagating path of seismic waves, the topography of the ground surface and the properties of ground surface layers. In order to have more reasonable seismic loading, it is necessary to examine how each factor mentioned above contributes to the actual motion. In this study we propose an improved method forsynthetic ground motion, by taking the actual focal process into consideration.
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Article type: Appendix
1991Volume 430 Pages
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Article type: Cover
1991Volume 430 Pages
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