桩-土-结构相互作用下网壳结构简化计算方法  

SIMPLIFIED ANALYSIS METHOD OF A LATTICED SHELL CONSIDERING PILE-SOIL-STRUCTURE INTERACTION

作　　者：刘毅[1] 李雄彦[1] 王国鑫[1] 薛素铎[1] 

机构地区：[1]北京工业大学空间结构研究中心,北京100124

出　　处：《工业建筑》2015年第1期36-42,共7页Industrial Construction

基　　金：国家自然科学基金项目(51078010;51278008);北京市自然科学基金项目(8112005);教育部长江学者和创新团队发展计划资助项目;教育部博士点学科专项科研基金(20121103110021);北京市委组织部优秀人才资助项目

摘　　要：基于桩-土相互作用中地基土的离散模型和有限元模型,采用空间S-R模型和整体有限元法分别建立桩-土-单层柱面网壳结构相互作用的简化模型和一体化模型,简化模型中将地基土以离散的弹簧单元模拟,通过与一体化模型的对比分析,探究空间S-R模型分析桩-土-结构相互作用下大跨空间结构的适用性和精确度。研究表明:采用空间S-R模型建立的简化模型能够较好地模拟网壳结构自振特性和网壳屋盖地震响应,便于工程应用。简化模型得到的网壳屋盖第一阶自振频率与一体化模型的计算误差在10%之内,在不同地震作用下,简化模型得到的网壳屋盖节点加速度峰值与一体化模型结果的最大误差为13.05%,位移最大值的最大误差为7.20%,杆件内力最大误差为9.59%。Based on the finite element model and discrete model of soil surrounding pile , the space S-R model and finite element method were adopted to establish a simplified model and an integrative model , which contains a single-layer cylindrical latticed shell , pile and its foundation soil .The soil was replaced with spring in the simplified model , and it was compared with the integrative model .The applicability and accuracy of the space S -R model for analyzing the large span space structure considering pile-soil-structure interaction (PSSI) were studied.The results showed that the simplified model could simulate natural vibration characteristic and seismic response of the shell fairly well , and it is convenient to be used in engineering .The error of the first order vibration frequency of the shell calculated by the simplified model was less than 10%compared with the results of the integrative model .The maximal error of the peak acceleration of node was 13.05%when it subjected to earthquake loads .The maximal error of the nodal displacement was 7.20%, and the maximal error of the internal force of the members was 9.59%.

关 键 词：单层柱面网壳 桩-土-结构相互作用 空间S-R模型 整体有限元法 自振频率 地震响应 

分 类 号：TU399[建筑科学—结构工程]