【摘要】 为了更加有效地反映单层网壳结构的动力响应特征,建立了一种描述单层网壳结构动力破坏程度的新指标——动力破坏指数,并给出了单层Keiwitt型网壳结构对应不同破坏程度的动力破坏指数分界值.在研究地震作用下单层网壳结构各项耗能的计算方法和变化规律的基础上,结合塑性耗能与最大位移建立了动力破坏指数的表达式,并通过对单层Keiwitt型网壳结构进行大量的参数分析,比较了动力破坏指数同位移、塑性杆件数两个指标的对应关系.结果表明,对于存在局部刚度薄弱的单层网壳结构,动力破坏指数的分析结果更加合理.动力破坏指数是进行单层网壳结构动力响应分析的有效指标.更多还原

【Abstract】 To describe the dynamical response characters of single layer latticed shell structures more effectively,a new index,i.e.dynamical damage index for describing the dynamical damage extent in the single layer latticed shell structure is set up,and the division index is provided corresponding to different dynamical damage grade.The calculating method and variation law of all kinds of consuming energy under the seismic action in the latticed shell structures are studied.Then the expression of dynamical damage index erected by combining the plastic consuming energy and maximum displacement is presented.Moreover,the comparison among the three index,dynamical damage index,displacement and plastic bar quantity,is completed by large numbers of parameter analysis in the single latticed shell structures.The results show that the dynamical damage index are reasonable to the latticed shell with local weakening stiffness.The dynamical failure index is effective for the quantificational analysis of dynamical failure for single layer latticed shells.更多还原