基于PKPM二次开发的结构构件可靠度指标计算  

Calculation of Structural Components Reliability Index Based on Secondary Development of PKPM

作　　者：白洋 李杰[1,2] BAI Yang;LI Jie(Department of Structural Engineering,Tongji University,Shanghai 200092,China;State Key Laboratory for Disaster Reduction in Civil Engineering,Tongji University,Shanghai 200092,China)

机构地区：[1]同济大学建筑工程系,上海200092 [2]同济大学土木工程防灾减灾全国重点实验室,上海200092

出　　处：《结构工程师》2024年第3期1-7,共7页Structural Engineers

摘　　要：提出了便于与商用结构设计软件对接的结构构件可靠度指标计算框架。采用有限差分法计算结构构件荷载效应关于基本随机变量的偏导数;用矩传播的方法计算构件荷载效应的前两阶矩;依据一次二阶矩法计算结构构件的可靠度指标β。在此基础上,编制了基于PKPM的二次开发程序,可用于计算RC框架结构梁抗弯和抗剪极限承载能力的平均安全系数和可靠度指标。实例分析结果表明,对于按6度设防设计的结构,在6度地震作用下有少数梁的可靠度指标低于我国建筑结构可靠性设计统一标准的要求;当地震作用为7度时,多数梁的可靠度指标低于标准要求。A method for calculating the reliability index of structural components,which is convenient for use in commercial structural design software,is proposed in this paper.The finite difference method is used to calculate the partial derivatives of load effects on basic random variables.The moment propagation method is used to calculate the first and second moments of components'load effects.The first order second moment method is used to calculate the reliability indexβof structural components.A secondary development procedure based on PKPM is written according to this method,which can calculate K andβof beams considering ultimate bending and shearing capacity in RC frame structures.The reliability index of an RC frame structure with a seismic fortification intensity of 6 is calculated using this procedure.The result shows that a few beams'reliability indices do not meet the code requirement under an earthquake with an intensity of 6,and under an earthquake with an intensity of 7,the reliability indices of most of the beams are lower than the code limit.

关 键 词：可靠度指标 一次二阶矩法 PKPM二次开发 

分 类 号：TU311.2[建筑科学—结构工程]