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Performance-Based Seismic Design for High-Rise Buildings in Japan
Nakai, Masayoshi,Koshika, Norihide,Kawano, Kenichi,Hirakawa, Kiyoaki,Wada, Akira Council on Tall Building and Urban Habitat Korea 2012 International journal of high-rise buildings Vol.1 No.3
This paper introduces the outlines of review and approval processes, general criteria and usual practices taken in Japan for the seismic design of high-rise buildings. The structural calculations are based on time-history analyses followed by performance evaluations. This paper also introduces structural design of two high-rise buildings: one is a 100 m high reinforced concrete residential building, and the other is a 300 m high steel building for mixed use.
Omika, Yukihiro,Koshika, Norihide,Yamamoto, Yukimasa,Kawano, Kenichi,Shimizu, Kan Council on Tall Building and Urban Habitat Korea 2016 International journal of high-rise buildings Vol.5 No.1
The reinforced-concrete multi-story shear-wall structure, which can free a building from beams and columns to allow the planning of a vast room, has increasingly been used in Japan as a high-rise reinforced-concrete structure. Since this structural system concentrates the seismic force onto multi-story shear walls inside, the bending deformation of the walls may cause excessive deformation on the upper floors during an earthquake. However, it is possible to control the bending deformation to within a certain level by setting high-strength and rigid beams (outriggers) at the top of the multi-story shear walls; these outriggers restrain the bending behavior of the walls. Moreover, it is possible to achieve high energy dissipation by placing vibration control devices on the outriggers and thus restrain the bending behavior. This paper outlines the earthquake response analysis of a high-rise residential tower to demonstrate the effectiveness of the outrigger frame incorporating vibration control devices.
Mazlina Razali,Mohd Ashraf Mohamad Ismail,Andrew Lee Kwan Yee,Raja Asyraf Azizan Raja Adnan,Kenichi Kawano,Kensuke Date,Yasuhiro Yokota,Sharan Kumar Nagendran,Zuraini Zainal 대한토목학회 2023 KSCE Journal of Civil Engineering Vol.27 No.8
The in-situ elastic modulus (E) is a vital parameter for describing rock strength in many engineering projects on rock slopes. The elastic modulus and uniaxial compressive strength (UCS) are typically investigated via laboratory tests using core samples. However, the direct determination of E is costly and time-consuming in preparing many intact samples from highly weathered Setul limestone. The knocking ball testing method is a non-destructive test that can quickly and easily obtain the elastic modulus of rock in-situ by striking the surface of a rock mass with a spherical steel hammer. This study presents the relationship between the elastic modulus of knocking ball (Ekb) and the uniaxial compressive strength of the Schmidt hammer (UCS-Schmidt). Results show that the regression coefficient correlation, R2 is 0.851, indicating a positive trend with a few outliers. The measured Ekb were also verified with mineral propertiesand correlated to differential weathering grades to confirm the accuracy of measurement results. The finding compared to previous similar studies tested on several types of rock show a statistically significant. This research highlights the effectiveness of the knocking ball method for determining the modulus of rock slope at different weathering grades. A high elastic modulus corresponds to a high uniaxial compressive strength, verified by the laboratory test. This study shows that the knocking ball can be useful for predicting in-situ elastic modulus.