Miyamoto Y.,Div. of Global Architecture |
Fujii S.,Obayashi Corporation |
Hoshizawa F.,Div. of Global Architecture |
Kashiwa H.,Div. of Global Architecture
Journal of Structural and Construction Engineering | Year: 2013
This paper addresses the developing of spread foundation surrounded with improved soil which reduces the response of the superstructure. The mechanical properties of the improved compound soil are investigated by laboratory tests. Then earthquake response behaviors of model structures are discussed with various contact conditions at the foundation bottom and different improved backfill soil around foundation by shaking table tests. Furthermore analysis results by 3D-nonlinear FEM are also discussed to clarify the effect of the contact conditions at the foundation bottom and the improved compound soil to seismic response of building.
Xing S.,Div. of Global Architecture |
Kashiwa H.,Japan Building Research Institute |
Nakano T.,Div. of Global Architecture |
Miyamoto Y.,Div. of Global Architecture
Journal of Structural and Construction Engineering | Year: 2015
This paper describes effects of strong nonlinear interaction between soil and piles or improved soil on seismic response of a building supported by piles. Shaking table tests by large earthquake inputs were conducted using structure model supported by piles in dry sand. 3D-nonlinear analyses were also conducted to investigate the effects of strong nonlinearity of ground around piles or improved soil. It is obtained that strong nonlinearity of ground around piles or improved soil affects the response of superstructure and pile stress. Especially, the strong nonlinear behavior of ground around improved soil changes the response of superstructure and the lateral resistance of piles. © 2015, Architectural Institute of Japan. All rights reserved.