Studies On Group Pile-soil-structure Interaction Based On Unidirectional Pushover Analysis

Earthquakes are burst-mode natural disasters that endanger human life andproperty security and social stability. China is one of the earthquake-prone countriesin the world,60percent of the country is high intensity seismic region, but seismicbehavior research of structure is still at earlier stage. Static elastic-plastic (Pushover)analysis method is a simple and effective method to assess the seismic behavior ofstructure. It provides more stable analysis results and reduces the contingency of theresults, assesses elastic-plastic deformation of the structure and componentseffectively, and overcomes the disadvantage of dynamic time-history analysis whichhas too much computation. But Pushover analysis assumes that the foundation of astructure has complete rigid restraint over the superstructure. With the developmentof high-rise building, the assumption appears relatively unreasonable which ignoresthe influence between soil-structure interactions and earthquake resistant behavior.According to the practical situation, relevant issues of structure system which usedthe Pushover method to analyze and under the considerations of pile-soil-structureinteraction are researched on this paper.In order to study the reaction of frame structure system that under rigidfoundation assumption or pile-soil-structure interaction simulation, Pushoveranalysis method has been used to push over a10-storey irregular reinforced concreteframe structure and a6-storey reinforced concrete frame on this paper. By changinga single parameter(Section dimension of beams or columns，m value) of structure todiscuss the impact on the earthquake resistant behavior of the parameter andsummarize the regular pattern. At last, chose three seismic waves as seismic inputsto process the nonlinear time-history analysis to analyze the above structure models,compared the results of Push-over analysis, further research has been made toinvestigate the influence of pile-soil-structure interaction over earthquake resistantbehavior of structure and check the conclusions of Pushover analysis.Base on the seismic ideal of displacement or structure performance, the aboveanalyses prove that the superstructure response results are different betweenconsidering pile-soil-structure interaction system and rigid foundation restraintsystem. The pile-soil-structure interaction system is better conforming to practicalengineering. The research of this paper can offer some suggestions for structuredesign with soil-structure interaction assumption and give certain help to experimental study.