Entity

Time filter

Source Type


Matsumoto T.,Shinozuka Research Institute | Hisada Y.,Kogakuin University | Nagano M.,Tokyo University of Science | Nozu A.,Port and Airport Research Institute | And 3 more authors.
AIJ Journal of Technology and Design | Year: 2013

We conducted a benchmark tests for the strong motion simulation methods using various theoretical methods (the wavenumber integration method, the discrete wavenumber method, and the thin layer method). For steps 5 and 6 in 2011, we conducted benchmark tests for actual sources in the Kanto sedimentary basin, such as the 1923 Kanto earthquake (M7.9). All the results generally show good agreements among simulations, but the surface waves seen in later part of observed ground motions were not reproduced well due to the limitation of use of flat-layered half-space models. Source


Tamura R.,Shinozuka Research Institute | Takada T.,University of Tokyo | Itoi T.,University of Tokyo | Ishiyama Y.,Hokkaido University
Journal of Structural and Construction Engineering | Year: 2011

In this paper, the influence of soil-structure interaction(SSI) effects on maximum displacement response of low-medium rise reinforced concrete building with relatively high strength are studied. A practical procedure with a simplified model including nonlinear SSI effects to predict maximum displacement response is proposed. Shear force-displacement relation and damping factor including SSI effects are obtained by using maximum displacements response of simplified model and surface ground layer due to streng ground motions. The maximum response estimation due to strong earthquake motions is demonstrated using example models of reinforced concrete 5-story building and surface ground deposit. The validity of proposed procedure is examined in cemparison with the results of nonlinear response analysis using 2-dimentional FEM model. Source


Nakamura T.,Shinozuka Research Institute | Sakai S.,Hazama | Yoshikawa H.,Tokyo City University
Journal of Structural and Construction Engineering | Year: 2011

Social attention has gathered in BCP recently, a technical concern is to estimate the restoration time of facilities due to earthquake quantitatively. In general, facilities are modeled as a system composed of plural components, then the system reliability technique is used for the estimation of the restoration period of system function. However, individual performance of the component is not considered, there is a blind spot that a redundant performance of the entire system is not appreciable. In this paper, the evaluation method of the decrease in the system performance due to the earthquake is proposed considering an individual performance of the component and the damage correlation between components. In addition, the evaluation method of the recovery curve that can show the recovery process of the system performance is proposed. As an example of the manufacturing process, the case analysis are carried out, the applicability in this method is discussed. Source


Ohashi K.,Kogakuin University | Nishikawa T.,Kogakuin University | Endo T.,Shinozuka Research Institute | Fujimura T.,JR EAST Design Corporation
Journal of Environmental Engineering | Year: 2011

Seismic countermeasures enabling the maintenance of high-rise plumbing system functions following an earthquake were elucidated from the perspective of business continuity planning (BCP) formulation, using the Kogakuin University high-rise building in Shinjuku as a model. Recovery curves were then used to determine the location of the post-seismic operations center and the effects of seismic countermeasures on existing plumbing systems. 1) Seismic countermeasure priorities can be effectively assessed by bottleneck index (B.I.) comparisons (see Note 1), with consideration given to seismic resistance, reparability and the relative importance of individual plumbing equipment and system components. Using recovery curves, it is possible to show the plumbing system recovery process. 2) Lower-level floor systems can be used most effectively as post-seismic operations centers, as the B.I. values of the low-floor equipment and plumbing that comprise the system functions are lower than those of the mid- and high-level floor systems. 3) The number of expected days, from earthquake to recovery, of lower-level floor functionality can be shortened to 2 days by implementing seismic countermeasures for break tanks, which exhibit the highest B.I values, as shown by recovery curves exhibiting the effects of countermeasure implementation. Source

Discover hidden collaborations