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Nishi-Tokyo-shi, Japan

Suzuki I.,JR EAST Design Corporation
IABSE Conference, Nara 2015: Elegance in Structures - Report | Year: 2015

Tokyo Station Marunouchi Building that is a huge structure, its over 330 m-long and 3-stories high brick building was completed as the central station of Tokyo about 100 years ago. Since the roof and the inside were burnt down in the W.W.2nd.1945, it had existed in a temporarily restored form. For the purpose of preservation and restoration of the building to its original appearance, isolation system was adopted. The building has a complex relative location to the nearby structures, such as the viaduct located next to the east side, and the large passage leading to underground station for using all time on center of the building. As many as 352 isolators units and with 158 oil dampers have made it possible to control the shaking of the structures and prevent contact with the neighboring viaduct. This work was carried out safely, while many passengers have been using this nation's largest terminal station every day. Source

Nakahashi Y.,JR EAST Design Corporation | Takagi J.,Tokyo Metroplitan University
Journal of Structural and Construction Engineering | Year: 2014

A significant number of wall-type precast reinforced concrete (WPC) residential buildings exist in Japan that were constructed more than 30 years ago but maintain good structural quality and seismic strength. In order to utilize this building stock, structural renovation is needed such as opening shear walls and addition of elevators, and seismic performance of pre and post renovation is to be evaluated. In authors' previous research, static pushover analysis models were created for standard existing WPC residential buildings under seismic load in the transverse direction. In this research, the models were extended for load in the longitudinal direction. The maximum base shear coefficient, which is defined as the ratio of lateral force to the building weight, is 0.73, and the preliminary failure mechanism is beam yielding, in addition to a limited number of beam shear failures, shear cracking of walls, and bearing failure of the vertical joints. The maximum strength and the failure mechanism calculated using an existing simple seismic performance evaluation method reasonably agreed with that obtained by the models. 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

Wakamura K.,JR EAST Design Corporation | Matsumura S.,University of Tokyo
AIJ Journal of Technology and Design | Year: 2010

Our detailed site investigation on the war damage reconstruction of the Tokyo Station, it was revealed that a lot of "Pre-Con" components were used. "Pre-Con" is the precasted concrete truss construction system developed during and after the war. In this paper, the range and the method of "Pre-Con"'s use in the war damage reconstruction are made clear. In addition, it was assumed that it was clear about introduction process and engineer who concerned with introduction. Source

Nakamura Y.,Waseda University | Yamada Y.,Waseda University | Nakano J.,Tokai University | Sakamoto K.,Research and Development Center | And 3 more authors.
12th International Conference on Indoor Air Quality and Climate 2011 | Year: 2011

The field survey on station Y was conducted from August to October 2009. Railway tracks of station Y run along the moat from north to south and the platform is lower than the surrounding topography. According to the field survey, dominant outdoor wind from north and south was observed along the railway tracks. Air temperature of the wind was lower than the neighbouring urban area by 1°C in the evening, implying that cool winds in the north-south direction was blowing along the railway tracks. Wind along the railway tracks could not be introduced to the concourse efficiently because of the wall and closed windows in the north-south axis. On the other hand, these walls and windows shield the station from strong winds like typhoon. Adjustment of openings in the north-south axis would improve of thermal comfort and protect from strong winds in station Y. Source

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