地震作用下单层柱面网壳倒塌机理分析与试验研究  

Collapse mechanism analysis and experiment study of single-layer cylindrical reticulated shells under earthquake action

作　　者：丁阳[1] 刘碧文[1] 葛金刚[1] 

机构地区：[1]滨海土木工程结构与安全教育部重点实验室(天津大学),天津300072

出　　处：《地震工程与工程振动》2013年第2期68-73,共6页Earthquake Engineering and Engineering Dynamics

基　　金：国家自然科学基金重大研究计划重点项目(90715034);国家自然科学基金项目(50978181);高等学校博士学科点专项科研基金项目(20090032110043)

摘　　要：考虑材料的Bauschinger效应、杆件损伤累积效应、杆件失稳及失稳后性能以及杆件失效与杆件断裂等因素分析单层柱面网壳结构的倒塌机理,并进行了试验研究。结果表明,地震作用下单层柱面网壳结构倒塌破坏主要原因是靠近纵边支座的斜杆端部形成塑性铰数量过多,甚至局部形成机构,结构整体刚度显著降低,无法承担地震作用。试验较好地证明了理论分析所得结论的正确性。This paper studies the collapse mechanism of single-layer cylindrical reticulated shells under earthquake action. The study considers the Bauschinger effect of material, the damage accumulation of members, the buckling and post-buckling behavior of members, and the failure and fracture of members. An experimental investigation is also conducted. The results show that the seismic collapse mechanism of the investigated structure is mainly due to the eXcessive plastic hinges occurring at the ends of diagonal members near supports. The occurrence of these hin- ges even causes unconstrained deformation of some local regions, and the overall structural stiffness is significantly reduced. Finally, the structure collapses, because it fails to bear the earthquake loads. The experimental results al- so confirm the correcmess of the theoretical analysis.

关 键 词：地震作用 单层柱面网壳 倒塌机理 塑性铰 模型试验 

分 类 号：TU393[建筑科学—结构工程] P315.91[天文地球—地震学]