球面网壳结构在强震下的失效机理  

FAILURE MECHANISM OF RETICULAR SHELLS SUBJECTED TO DYNAMIC ACTIONS

作　　者：沈世钊[1] 支旭东[1] 

机构地区：[1]哈尔滨工业大学土木工程学院

出　　处：《土木工程学报》2005年第1期11-20,共10页China Civil Engineering Journal

基　　金：国家自然科学基金重点资助项目 (50 3380 1 0 );国家自然科学基金资助项目 (50 2 780 2 0 )

摘　　要：研究了球面网壳结构在地震等动力荷载作用下两种可能的失效机理 :由于几何非线性起主要作用导致的动力失稳和由于塑性变形过度发展导致的强度破坏。提出了统一的基于响应分析的关于网壳结构失效机理的理论框架。对单层球面网壳在简谐荷载和地震荷载作用下的失效机理进行了较系统的分析 ,提出了具体的动力失稳和强度破坏判别准则 ,求得了相应的极限荷载。取得的结果具有良好的规律性 。Two kinds of failure mechanisms of reticular shells subjected to dynamic actions ,dynamic instability mainly due to the second-order effect of shell structures,and the strength failure mainly due to excessive development of plastic deformations,are studied in a unified theoretical frame based upon non-linear dynamic response analysis.The criteria for discrimination of strength failure, as well as of dynamic instability of reticular shells,are proposed for practical applications.Case examples of single-layer reticular domes subjected to harmonic actions with different frequencies,as well as to different earthquake motions,are thoroughly analyzed,the failure mechanism is discussed,and the corresponding ultimate loads are obtained,thus,the effectiveness of the suggested theoretical procedure is verified.

关 键 词：网壳结构 简谐荷载 地震作用 失效机理 动力稳定 强度破坏 

分 类 号：TU393.3[建筑科学—结构工程]