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| NONLINEAR ANALYSIS OF HIGH-RISE BUILDING SUPERSTRUCTURE-PILE-SOIL MASS INTERACTION CONSIDERING CONTACT EFFECT UNDER SEVERE EARTHQUAKE |
| WU Chenghao1，2，YAO Qianfeng1，YAN Hongxia1，3，LI Jitao1 |
| (1. School of Civil Engineering，Beijing Jiaotong University，Beijing 100044，China；2. RIOH Transport Consultants Co.，Ltd.，Beijing 100191，China；3. School of Civil Engineering and Architecture，Hebei University，Baoding，Hebei 071002，China) |
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Abstract In order to study and predict nonlinear seismic response of high-rise buildings better under earthquake especially severe earthquake，the Jiannanchun hotel，located in Mianzhu city of Sichuan province，which endured Wenchuan Earthquake，is selected for research object. Superstructure-pile-soil mass three-dimensional finite element physical model is established by the popular finite element software ABAQUS. Different dynamic characteristics of superstructure caused by varied inter-pile soil and bearing layer soil are discussed via comparing the vibration characteristics and dynamic responses of superstructure upon rigid subgrades and pile-soil foundation. Conclusion is drawn for the influences of inter-pile soil and bearing layer soil on dynamic characteristics of superstructure thereby. Meanwhile，the influences of nonlinearities of superstructure，soil mass and pile-soil contact on nonlinear responses of the interaction system are considered. Comparison between time-history analysis results of dynamic elastoplasticity and disaster investigation performed after Wenchuan Earthquake indicates that the ability of anti-collapse of superstructure of high-rise buildings considering interaction effect meets the actual circumstances better than traditional design method. Results of finite element model matching site investigation well show that software ABAQUS is greatly applicable for severe nonlinear interaction problem analysis of high-rise buildings；and it can be guidance for engineering practice. Besides，the proposed method supplies important theoretical basis for engineering practice.
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Received: 28 April 2010
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2011, Vol. 30 
