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.
出处
《世界地震工程》
CSCD
北大核心
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)
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
longitudinal edge supports on ground
single-layer cylindrical latticed shell
collapse mechanism under severe earthquakes
dynamic strength failure
