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Kobayashi M.,Meiji University | Asano K.,Meiji University | Hisada H.,Meiji University | Fujimori S.,MHS Planners
AIJ Journal of Technology and Design | Year: 2012

In this paper, the height and depth of the building in the region expected to tsunami inundation are calculated by compared tsunami load to necessary horizontal load-carrying capacity in the base of the building. In addition, amount of shear walls to reinforce the building and cast-in-place concrete pile to resist tsunami load are calculated. Based on these studies, structural planning flows and examples by using three building models are shown.

Kobayashi M.,Meiji University | Inden T.,MHS Planners | Isozumi Y.,Meiji University | Hasegawa T.,Japan Building Research Institute | Kitamura H.,Tokyo University of Science
Journal of Structural and Construction Engineering | Year: 2011

This study is to propose structural capacity index, IsCON, which is converted evaluation of seismic capacity of seismic retrofitted buildings with hysteretic dampers based on the energy balance method. At first it is proposed that the IsCON of SDOF is explicitly-expressed by amount of absorption energy of buildings. Then it is expanded to the expression of MDOF considering damages concentrated in a particular story. Using results of seismic response analysis, it is confirmed that the IsCON is able to properly evaluate the seismic capacity of buildings with hysteretic dampers.

Hikone S.,Arup | Misawa Y.,Arup | Iwata M.,Kanagawa University | Iwamoto S.,Kanagawa University | Nakamura M.,MHS Planners
Large Structures and Infrastructures for Environmentally Constrained and Urbanised Areas | Year: 2010

This research challenges the customary reinforcement methods which are focusing on the structural performance and proposes an integrated-façade-system which not only seismic retrofit, but also improves the environmental and architectural quality. A minimum dimensions buckling restrained brace was developed and in such way that it can be perfectly harmonized with louvers. The louvers make it possible to control and optimize the heat load and the daylight of buildings. At first the system has been used for the main gathering points in the cities' disaster plans, but due to its flexibility it could easily be extended to other facilities in the future.

Ku C.J.,Tokyo Polytechnic University | Tamura Y.,Tokyo Polytechnic University | Yoshida A.,Tokyo Polytechnic University | Miyake K.,MHS Planners | Chou L.S.,General Education Center
Wind and Structures, An International Journal | Year: 2013

Output-only modal parameter identification is based on the assumption that external forces on a linear structure are white noise. However, harmonic excitations are also often present in real structural vibrations. In particular, it has been realized that the use of forced acceleration responses without knowledge of external forces can pose a problem in the modal parameter identification, because an external force is imparted to its impulse acceleration response function. This paper provides a three-stage identification procedure as a solution to the problem of harmonic and white noise excitations in the acceleration responses of a linear dynamic system. This procedure combines the uses of the mode indicator function, the complex mode indication function, the enhanced frequency response function, an iterative rational fraction polynomial method and mode shape inspection for the correlation-related functions of the force-embedded acceleration responses. The procedure is verified via numerical simulation of a five-floor shear building and a two-dimensional frame and also applied to ambient vibration data of a large-span roof structure. Results show that the modal parameters of these dynamic systems can be satisfactorily identified under the requirement of wide separation between vibration modes and harmonic excitations.

Nakasono M.,MHS Planners
A + U-Architecture and Urbanism | Year: 2011

In 2010, MHS Planners, Architects & Engineers renovated its 50-year-old head office building. The renovation became the first project to be certified for the highest S rank in the CASBEE for Renovation environmental assessment standard, a+u spoke to the director Masaki Nakasono about the firm's introduction of BIM, its renovation (BEEMS) division and other initiatives.

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