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- Journal of Structural and Construction Engineering (Transactions of AIJ)
Volume 79, Issue 705
Displaying 1-13 of 13 articles from this issue
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Tetsuhiro ASARI, Daisuke UJIIE, Mitsumasa MIDORIKAWA, Taichiro OKAZAKI2014 Volume 79 Issue 705 Pages 1569-1578
Published: November 30, 2014
Released on J-STAGE: November 30, 2014
JOURNAL FREE ACCESSFive-degrees-of-freedom models that account for uplift, rocking, and sway of the foundation, in addition to horizontal and vertical deformation of the superstructure, were used to study the beneficial effect of foundation uplift to reduce the seismic damage to building structures. The elastic models accounted for geometric nonlinearity and expressed soil-and-foundation interaction as a function of contact area. The nonlinear models were subjected to a suite of ground motions. The results indicated that the vertical component of ground motions does not significantly affect the horizontal response of the superstructure and that the vertical response of the superstructure is produced primarily by foundation uplift.View full abstractDownload PDF (2911K) -
Hidenori ISHIGAKI2014 Volume 79 Issue 705 Pages 1579-1587
Published: November 30, 2014
Released on J-STAGE: November 30, 2014
JOURNAL FREE ACCESSEigenvalue analysis considering Maxwell model is proposed in this study, so as to compute properties and distribution of viscous dampers automatically. A real number eigenvalue of Maxwell model shows dynamic characteristic of viscous damper. If the real number eigenvalue becomes equal to a natural circular frequency of analysis model, the model will have the maximum energy dissipation to the vibration mode. In this paper, viscous damper distribution of a frame structure has been computed by the proposed method. The results have showed that the structure has the highest viscous damping factor to the design vibration mode.View full abstractDownload PDF (679K) -
Toshimi SATOH2014 Volume 79 Issue 705 Pages 1589-1599
Published: November 30, 2014
Released on J-STAGE: November 30, 2014
JOURNAL FREE ACCESSWe revise the generation method of stochastic Green's functions by considering into surface waves and scattering waves as well as direct S-waves using strong motion records of moderate-sized interplate earthquakes along the Sagami Trough. The spectral ratios of later time windows to S-wave windows are modeled by the focal depth and hypocentral distance with site factors. The envelopes of later time windows are modeled based on the scattering theory in which body waves and Rayleigh waves are considered. The stochastic Green's function is generated by adding S-wave windows and the later time windows in the time domain.View full abstractDownload PDF (4815K) -
DIRECT IDENTIFICATION OF STIFFNESS FOR FLEXURAL-SHEAR BUILDING MODEL BASED ON EARTHQUAKE OBSERVATIONYoshiki IKEDA, Hiroya HANAFUSA2014 Volume 79 Issue 705 Pages 1601-1611
Published: November 30, 2014
Released on J-STAGE: November 30, 2014
JOURNAL FREE ACCESSThis paper proposes a direct identification method based on earthquake observation for an MDOF linear flexural-shear building model. The method identifies both shear and bending springs in the time domain by utilizing the horizontal responses at each lumped mass. The identification is conducted from the first story to the upper stories, and the last process is to evaluate the equivalent shear spring in the highest story. The advantage is to require neither iteration analysis nor ARX models nor frequency transmissibilities. Numerical examples indicate effects of damping matrices, a statically condensed stiffness matrix and noise in measurement.View full abstractDownload PDF (5850K) -
Masaaki TSUJI, Chika TSUJI, Nanami KATAOKA2014 Volume 79 Issue 705 Pages 1613-1623
Published: November 30, 2014
Released on J-STAGE: November 30, 2014
JOURNAL FREE ACCESSThe purpose of this paper is to disclose the fundamental properties of a multiple isolation structure that contains a base isolation story and a middle isolation story. Design formulae of stiffness and damping coefficient of both isolation stories are derived under condition that a base isolation building and a multiple isolation building have the same 1st natural period and damping factor. It is shown that the multiple isolation building designed by the formulae behaves much smaller interstory drift of base isolation story than that of the base isolation building. Eigenvalue analysis and time history analysis to multi-degree-of-freedom models are performed to verify the accuracy of the design formulae.View full abstractDownload PDF (12023K) -
Akira IMAMURA, Takayuki HASHIMOTO, Yasutsugu SUZUKI, Naohito ADACHI, Y ...2014 Volume 79 Issue 705 Pages 1625-1635
Published: November 30, 2014
Released on J-STAGE: November 30, 2014
JOURNAL FREE ACCESSIt is important to accurately estimate the effects of the building basemat uplift and structural response for strong earthquake motions in seismic design of nuclear power plant buildings. In this paper, dynamic centrifuge tests were performed using rigid structure on clay deposits embedded with clay to investigate the difference of structure response due to difference in the embedded stratum, and effect of adhesion between basemat and clay deposit. It was shown that (1) the embedment and the adhesion were effective in suppressing uplift; (2) the JEAC equation for ground contact ratio gave a safe side estimation.View full abstractDownload PDF (24640K) -
Michito SHOJI, Takeshi FUJIMORI2014 Volume 79 Issue 705 Pages 1637-1645
Published: November 30, 2014
Released on J-STAGE: November 30, 2014
JOURNAL FREE ACCESSIt is useful to reuse existing piles when the building is rebuilt, but the piles can be damaged by earthquakes. This paper describes the evaluation method of the lateral resistance of damaged piles. The major findings are summarized as follows: 1) It is important for evaluating the lateral resistance to consider the decrease in elastic modulus of pile and the formation of hinge region caused by the pile damage. 2) When the location of damage is below 2.1/b, the lateral resistance of the damaged pile is roughly equivalent to that of the fine pile despite the extent of damage.View full abstractDownload PDF (1065K) -
Kenji SASAHARA, Huynh Tan HIEP, Yukihiro MATSUMOTO2014 Volume 79 Issue 705 Pages 1647-1656
Published: November 30, 2014
Released on J-STAGE: November 30, 2014
JOURNAL FREE ACCESSIn this paper, an alternative evaluation procedure of seismic responses using the continuum shell analogy and analogical lamped mass model has been proposed. Then, the linear time history response analyses for various input earthquake waves have been carried out. The adopted analytical parameters are of the open angle of cylindrical shell, the margin of safety ratio of roof members and the horizontal resistance of sub-structure. Also, the sectional area of roof members has been designed by dead load. As the result, it is proposed that the maximum response acceleration and displacement can be evaluated by using the present evaluation method even if the higher-mode vibrations are predominated. Based on these, it is suggested that the present simple evaluation method would be useful for seismic design for single layer cylindrical latticed shell roof structures.View full abstractDownload PDF (2939K) -
Yuebing LI, Yasushi SANADA2014 Volume 79 Issue 705 Pages 1657-1665
Published: November 30, 2014
Released on J-STAGE: November 30, 2014
JOURNAL FREE ACCESSThis paper proposes and verifies a strengthening method for seismically substandard beam-column joints where contains no transverse reinforcement. Three exterior beam-column joint specimens were tested: one un-strengthened control specimen, another strengthened by installing wing walls to both columns, and the other only to the lower-story column. Failure modes of the strengthened specimens were shifted from joint failure to beam yielding except for one condition where the wing wall was effective only to pull the beam. Design concept is presented to prevent joint failure by the proposed strengthening method.View full abstractDownload PDF (1478K) -
Kikuo IKARASHI, Satoshi MIYAZAKI, Yasuo ICHINOHE, Kohji FUKUDA, Junich ...2014 Volume 79 Issue 705 Pages 1667-1675
Published: November 30, 2014
Released on J-STAGE: November 30, 2014
JOURNAL FREE ACCESSThe H-shaped beams reinforced by the horizontal stiffeners at the beam end can be expected improvements in the plastic deformation capacity. The purpose of this paper is to show plastic deformation capacity of the H-shaped beams and to clarify the optimal stiffener shape. For this purpose, authors conduct cyclic loading tests on the several parameters ( length of the beam, thickness of the web and length, width and thickness of the stiffener ), and confirm the distinction of plastic deformation capacity related to the stiffener shape. Furthermore, in addition to the loading tests, by using the numerical analysis and the energy method, authors fix the required rigidity and the required length of stiffeners according to the demanded performance.View full abstractDownload PDF (2998K) -
Shingo KOMATSU, Takao TAKAMATSU, Hiroyuki TAMAI, Teruaki YAMANISHI2014 Volume 79 Issue 705 Pages 1677-1685
Published: November 30, 2014
Released on J-STAGE: November 30, 2014
JOURNAL FREE ACCESSThis paper proposes an anti-symmetric Z-type NC braced frame as a new system for a seismic response reduction mechanism based on elastic strain energy accumulation. The energy accumulation is obtained from one-directional incremental torsional deformation of the structure and the system has the advantage that the seismic response decreases without damage. Shaking table tests and numerical analyses on single-story models are carried out to clarify the basic capability of this system. Actualscale numerical models with NC braced or hysteretic dampers are analyzed numerically to clarify the seismic response reduction by torsional deformation, brace stiffness and elastic-plastic behavior of the braces.View full abstractDownload PDF (2016K) -
Study of connection between RC frame and steel roof Part 1Satoshi YAMADA, Yuko SHIMADA, Kazuki TOMATSU, Yuki SHIRAI, Yuka MATSUM ...2014 Volume 79 Issue 705 Pages 1687-1697
Published: November 30, 2014
Released on J-STAGE: November 30, 2014
JOURNAL FREE ACCESSOne of the typical damage in gymnasiums due to the 2011 Tohoku earthquake was failure at connection between RC frame and steel roof. In order to prevent the damage of connection between the RC frame and the steel roof, it is necessary to conduct experimental study which simulates the stress condition of connection part under earthquake, and to clarify the relation between the detail and the structural performance of the connection. Moreover, it is necessary to clarify behavior of the RC-frame and the steel frame roof under earthquake. As the start of research, cyclic loading tests on a connection between the RC frame and the steel roof were conducted. In this paper, the background of this research, parameters of specimens, the experimental method, and the outline of experimental results were described.View full abstractDownload PDF (2628K) -
Kazuhiro HAYASHI, Ryosuke NISHI, Ryusuke ENOMOTO, Masahiro KURATA, Mas ...2014 Volume 79 Issue 705 Pages 1699-1707
Published: November 30, 2014
Released on J-STAGE: November 30, 2014
JOURNAL FREE ACCESSConcrete filled steel Tubes (CFTs) have been used increasingly for providing large stiffness and strength. Many studies were conducted on CFT columns, and a new configuration design with the concrete filled double-skin steel tubes (CFDSTs) was also developed. This paper presents an experimental investigation on CFT and CFDST columns using ultra-high strength steel. Six specimens with various dimensions and types of steel were tested by combined axial and lateral loading. Influences of those design parameters on the seismic behavior of CFTs and CFDSTs, i.e. initial stiffness, ultimate moment, strength deterioration, local buckling and fracture failure, were investigated.View full abstractDownload PDF (1719K)
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