考虑土-桩-结构相互作用下的生态复合墙结构pushover分析

PUSHOVER ANALYSIS OF SOIL-PILE-ECO-COMPOSITE WALLS INTERACTION SYSTEM

基于能力谱方法应用子结构原理对天然地基上带群桩基础的生态复合墙结构进行平面的静力弹塑性(Pushover)分析。建立弹簧单元模拟群桩基础,采用Davies方法确定桩的刚度;基于刚架-等效斜撑力学模型,提出考虑土-桩-生态复合墙结构共同作用的整体分析模型,并对比分析在不同地震烈度作用时土-桩-结构的共同工作问题。计算结果表明:在多遇地震条件下,结构性能点处的顶点位移Un(刚性地基)小于Un'(相互作用),而在罕遇地震条件下,则有Un(刚性地基)大于Un'(相互作用);考虑土-桩-结构相互作用后,相同地震烈度条件下结构在性能点时的基底剪力较刚性地基情形有所增大。

Capacity spectrum method was adopted to perform nonlinear static seismic response（pushover） analysis for eco-composite wall structure with grouped pile foundation resting on natural foundation soil.The substructure technique was adopted to simulate pile group with a group of springs,the grouped pile stiffness was determined with Davies method.According to the rigid frame-equivalent brace model,the Pushover model of soil-pile-structure interaction system was established.The differences of the results of two models under different earthquake intensities were discussed.The culated results show that in frequent earthquake conditions,structure performance point vertex displacement Un（rigid foundation） U′ n（interaction）;while in rare earthquake conditions,There is the Un（rigid foundation） U′ n（interaction）.When considering soil pile structure interaction,under the same seismic intensity conditions the base shear at performance point of the is increased as compared with a rigid foundation.