地震作用下单层网壳结构动力稳定性分析的能量准则  

Energy Criterion for Dynamic Stability Analysis of Single Layer Reticulated Shell Structures under Seismic Ground Motions

作　　者：徐军 孙锐 XU Jun;SUN Rui(School of civil engineering,Hunan University,Changsha 410082,China)

机构地区：[1]湖南大学土木工程学院,长沙410082

出　　处：《结构工程师》2018年第A01期42-47,共6页Structural Engineers

基　　金：国家自然科学基金资助项目(51608186);中央高校基本科研业务项目(531107040890)

摘　　要：从结构能量变化的角度研究单层网壳结构的动力稳定性,通过考察单层网壳结构在地震作用下的能量响应特征,发现当网壳结构所消耗的能量超过外界地震动输入的总能量时,结构将发生动力失稳,得出表征结构动力稳定性的能量函数表达式,据此提出了一种基于能量的网壳结构动力稳定性定量判定新准则。通过考察该能量函数极小值随地震加速度峰值变化的全过程曲线,可以得到地震作用下网壳结构的临界荷载。通过实例分析验证了该准则的合理性,实现了地震作用下单层网壳结构动力稳定性的定量分析。In this paper,the dynamic stability of single-layer reticulated shell structures is investigated from the point of view of energy.From the energy response characteristics of single-layer reticulated shell structures under seismic ground motions,it is found that the structure will suffer dynamic instability when the total dissipated energy starts to be larger than the input energy provided by the external seismic excitations.In this regard,an energy function,which is related to the dynamic stability properties of structures,can be obtained and therefore a new criterion can be formulated to quantitatively identify the structure is dynamically stable or not.Besides,the critical load of reticulated shell structures under seismic ground motions can be determined by the complete minimum of energy function v.s.peak acceleration curve.Numerical example is investigated to validate the proposed criterion.By using the proposed criterion,the dynamic stability analysis of single layer reticulated shell structures under seismic ground motions can be quantitatively implemented.

关 键 词：网壳结构 能量响应 总输入能 特征能量 判定准则 动力稳定性 

分 类 号：TU399[建筑科学—结构工程]