SRC框架结构变形能力抗震可靠度分析

分析了SRC框架结构基于变形能力的抗震可靠度,分别阐述了多遇地震作用下结构弹性层间位移限值和罕遇地震作用下结构弹塑性层间位移限值的计算方法,基于M ATLAB编程得出结构弹性层间位移、结构弹性层间位移限值、结构弹塑性层间位移和结构弹塑性层间位移限值的概率分布类型及统计特性。结合实例,讨论了SRC框架结构变形能力抗震可靠度指标与结构强度设计和结构延性设计的关系。另外,推导了SRC框架柱截面抗剪刚度和截面抗弯刚度的计算公式,采用刚度折减系数简便地实现了弹塑性层间剪切刚度的计算。最后,指出“强剪强弯”的概念设计对提高SRC框架柱极限变形能力十分重要。

Seismic Reliability Analysis of SRC Frame Structures Based on Deformability

The seismic reliability analysis based on deformability of SRC frame structures was processed.Computation methods were expounded relatively for the maximum elastic inter-story drift value under frequently occurred earthquake action and the maximum elastic-plastic inter-story drift under seldom occurred earthquake action.Statistical characteristics and distribution patterns of elastic interstory drift value and its maximum value were achieved based on MATLAB,and elastic-plastic inter-story drift value and its maximum value as well.In the light of an example,correlations among seismic reliability indexes,structural strength design and structural ductility design were discussed.In addition,expressions of sectional flexural stiffness and sectional shear stiffness of SRC frame columns were derived.Meanwhile,stiffness reduction factor was adopted to simply compute elastic-plastic inter-story shear stiffness.At last,the concept design of better shear and better bending behavior is pointed to be very important to enhance ultimate deformability of SRC frame columns.