节点刚度对单层柱面网壳动力稳定性的影响  

Joint stiffness effect on dynamic stability of single-layer cylindrical reticulated shell under different PGAs

作　　者：薛素铎[1,2] 王宁[3] 李雄彦[1,2] 

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]北京工业大学工程抗震与结构诊治北京市重点实验室,北京100124 [3]河北联合大学河北省地震工程研究中心,河北唐山063009

出　　处：《地震工程与工程振动》2014年第2期27-33,共7页Earthquake Engineering and Engineering Dynamics

基　　金：国家自然科学基金重大研究计划项目(90715034);国家自然科学基金项目(51078010);北京市自然科学基金项目(8112005)

摘　　要：采用时程分析法研究了PGA(地震动峰值加速度)变化时,单层柱面网壳精细化模型节点刚度变化对结构动力稳定性的影响。研究中考虑了结构参数(矢跨比、长宽比等)的变化,通过改变节点壁厚实现节点刚度的变化,共建立了4组精细化模型。对比分析结果发现所有模型组得出的规律接近,即当PGA超过结构的失稳临界加速度值时,PGA越小节点刚度的增加对提高结构抗动力失稳的效果越明显,并且此规律受矢跨比、长宽比等结构参数变化的影响很小。Time-history method is used to study the joint stiffness effect on dynamic stability of single-layer cylindri- cal reticulated shell fine model as the Ground Peak Acceleration （PGA） is changing. Meanwhile, the structural pa- rameters such as rise-span ratio and length-width ratio and so on are considered. The joint stiffness is altered ac- cording to the change of the wall thickness of joint. In total, 4 groups of fine models are used in the example. The result from these 4 groups of models is similar. It shows the joint stiffness effect on the dynamic stability of these structures is larger when PGA is smaller （PGA is larger than collapse acceleration） , and this rule is not changed when the structural parameter is different.

关 键 词：单层柱面网壳 精细化模型 节点刚度 动力稳定性 地震动峰值加速度 

分 类 号：TU393.3[建筑科学—结构工程] P315.92[天文地球—地震学]