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Projects : CUREE-Kajima Joint Research Program

CKI-07: Building-Foundation-Soil Interaction Effects

• Prof. G. R. Martin
• Prof. Ronaldo I. Borja
• Prof. H. Allison Smith
• Dr. J. P. Bardet
• Dr. S. W. Chi
• Dr. Q. Huang

• Dr. Kenji Miura
• Dr. Yuji Miyamoto
• Mr. Ariyoshi Yamada
• Mr. Masayuki Nagano
• Mr. Yuji Sako
• Mr. Yo Hyodo
• Mr. Kiyoshi Masuda
• Mr. Tatsuya Maeda
• Mr. Eiji Kitamura
• Mr. Kiichi Suzuki
• Mr. Yasutsugu Suzuki
• Mr. Atsonobu Fukuoka

Many high rise buildings are under construction or being planned on the reclaimed coastal area around Tokyo and San Francisco bays. These buildings usually have a pile group foundation or a composite foundation, consisting of an exterior wall foundation and internal pile group. Because of bearing or lateral capacity concerns, the behavior of structures built on such foundations is greatly influenced by nonlinear soil-foundation-structure interaction during strong earthquakes. In cases where liquefiable sand deposits occur in foundation soils, further complications arise during soil-foundation interaction due to pore pressure increases in the saturated sands. An improved understanding of the effects of nonlinear soil-foundation interaction is needed in order to develop improved design methods for these types of foundations.

The objectives of this project were to evaluate the ability of nonlinear numerical models to simulate the complex soil-foundation-structure interaction behavior during strong earthquake shaking. The collaborative research program was formulated as having three main task areas:

1. A Kajima team project examining the earthquake response of buildings on a pile or composite foundation system using two-dimensional finite element methods or beam/Winkler spring models. A specific building (the K-Building) was used for several of the analyses. This building has 34 stories and a basement supported on an exterior wall foundation and internal piles. Fckmdation soils comprised liquefiable sand layers and soft clay deposits to depths of about 23 meters overlying dense sands. The exterior wall foundation and piles were founded in the underlying dense sand stratum. An earthquake time history with a maximum acceleration of about 0.4g was used to simulate strong earthquake motion.

2. The second task, undertaken by the University of Southern California (USC) team, also focused on the use of nonlinear finite element analyses of the K-Building. In these studies, the numerical simulation of nonlinear soil behavior was accomplished through the use of a simplified plasticity-based bounding surface theory incorporating a Drucker-type failure surface (BDP model). The effective stress formulation used simulated earthquake-induced pore pressure increases and allowed simultaneous diffusion.

3. The third task, undertaken by the Stanford team, focused on the development of a methodology for evaluating nonlinear soil-structure interaction effects in the time domain for rigid
foundations on soft cohesive soils. In this study, the dynamic response of rigid foundations on an elasto-viscoplastic-space was investigated using a linear combination of isotropic and kinematic hardening to model the soil constitutive response.

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CKI-07 PDF 4.8 MB

Also listed as Report No.: CK92-01 (February 1992)

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Consortium of Universities for Research in Earthquake Engineering
last updated 02.20.15