SEISMIC BEHAVIOR OF PILES SUPPORTING TALL BUILDINGS AND THE CONSIDERATION OF GROUND RESPONSE EFFECTS IN DESIGN(1997)
Yoshihiro Sugimura（Tohoku University） ・K.Fujiwara & T.Ohgi（FUJITA Corp）・Madan B.Karkee（GEOTOP）
The paper concerns analytical study of the seismic behavior of piles supporting tall reinforced concrete buildings at locations ofdeep soil deposit such as the Tokyo bay area. The nonlinear response of the soil-pile-structure system under extreme earthquake shaking was investigated by 2-D FEM analysis considerlng three simple soil condltions. It is seen that the response forces on piles from the soil-pile-building interaction system can be resolved into those from two constituting systems consisting of the building part and the foundation part similar in concempt to the modal resolution in elastic analysis. Large response forces develop at Interfaces of layered soil deposit reflecting strong infiuence of ground response effects, which is not adequately accounted for in the current pile deslgn practice. A simple design approach based on the use of the design response spectra, and capable of accounting for the ground response effects, is proposed for practical application.