对角预应力拉索重组竹框架地震易损性分析

Seismic vulnerability analysis of recombinant bamboo frame with diagonal prestressed cable

传统的竹(木)框架结构因其抗侧力性能差,导致地震灾害下损失较大。在竹(木)框架中增设对角预应力拉索,可以有效地提高其抗侧刚度。为研究重组竹框架结构中对角预应力拉索对结构抗震失效概率,采用增量动力分析(IDA)对其易损性进行分析。通过定义3个性能水平,以地震峰值加速度作为地震强度指标,结构的层间位移角作为结构响应参数,分析得到无对角预应力拉索的重组竹框架的地震易损性曲线。最后分析对角预应力拉索对重组竹框架,得到2种预应力水平下的地震易损性曲线,并与无对角预应力拉索的重组竹框架的地震易损性曲线进行了对比,研究对角预应力拉索对重组竹框架地震易损性的影响。

The traditional bamboo or timber frame structures are caused great loss under earthquake disaster,due to their poor lateral resistance.Adding diagonal prestressed cables in the bamboo or timber frame can effectively improve its lateral stiffness.In order to study the seismic failure probability of the diagonal prestressed cables in the recombinant bamboo frame structures,the vulnerability of the structures was analyzed by incremental dynamic anal- ysis (IDA).By defining three performance levels,and taking the seismic peak acceleration as an earthquake intensity index and the inter-layer displacement angles of structures as the structural response parameters,the seismic vulnerability curves of the recombinant bamboo frame structures without diagonal prestressed cables were analyzed. Finally,the recombinant bamboo frame structures with diagonal prestressed cable were analyzed,and the seismic vulnerability curves under two kinds of prestressed level were obtained,and they were compared with the seismic vulnerability curves of the recombinant bamboo frame without diagonal prestressed cable.The effect of the diagonal prestressed cable on earthquake vulnerability of the recombinant bamboo frame structures was studied.