基于PKPM二次开发的结构构件可靠度指标计算OACSTPCD

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 index β of structural components.A secondary development procedure based on PKPM is written according to this method,which can calculate K and β of 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.