纵边落地支承单层柱面网壳强震倒塌机理及参数分析  

Collapse mechanism and parameter analysis of single-layer cylindrical latticed shell with longitudinal edge supports on ground under severe earthquake

作　　者：杨大彬[1,2] 张毅刚[1] 吴金志[1] 

机构地区：[1]北京工业大学城市与工程安全减灾省部共建教育部重点实验室,北京100124 [2]山东建筑大学土木工程学院,山东济南250101

出　　处：《世界地震工程》2011年第4期143-148,共6页World Earthquake Engineering

基　　金：国家自然科学基金重大研究计划重点支持项目(90715034)

摘　　要：采用基于荷载域的全过程分析方法对纵边落地支承单层柱面网壳的强震倒塌机理进行了研究。结果表明,该类型网壳呈现明显的沿跨度方向的单向受力特征,长宽比对其受力几乎没有影响;其强震倒塌具有很强的规律性,破坏类型均为动力强度破坏;矢跨比对能引起其倒塌的PGA有很大影响,但对其发展趋势并无固定的影响规律;屋面质量的增大及初始几何缺陷均会降低该类型柱面网壳的倒塌PGA,其降低程度因柱壳而异。The collapse mechanism of single-layer cylindrical latticed shell under severe earthquakes is analyzed with full-range responses method based on load domain.Results show that this kind of shell takes on a very distinct one-way mechanical characteristic along the span direction,and its length to span ratio has little influence on its mechanical performance.There is a strong regularity in its collapse behaviour,and all the collapse patterns belong to the dynamic strength failure mode.Its rise to span ratio has a tremendous influence on the collapse PGA,but the influence has no fixed regularity.The collapse PGA will decrease when the roof mass increases or there is initial geometrical imperfection,but the decreased magnitude depends on the shells.

关 键 词：纵边落地支承 单层柱面网壳 强震倒塌机理 动力强度破坏 

分 类 号：TU352.11[建筑科学—结构工程]