基于改进折减刚度法的钢-混凝土组合梁挠度可靠度分析

摘要

根据改进折减刚度法计算的钢-混凝土组合梁的抗弯刚度,依据挠度限值的钢-混凝土组合梁正常使用极限状态功能函数,结合验算点法编制Matlab程序,通过算例对钢-混凝土组合梁计算在混凝土强度等级、计算跨度、钢材牌号、连接件数量、边界条件影响下的挠度可靠指标,并分析各随机变量对挠度可靠指标灵敏性的影响规律.结果表明:计算跨度、边界条件对可靠指标影响较大,计算模式不定系数对可靠指标灵敏度的影响较大.%The deflection reliability is calculated under the influence of concrete strength grade,calculation span,steel grade,shear connectors and boundary condition through examples,according to the stiffness of composite beam which is calculated based on the modified reduced stiffness method with the deflection limits performance function of composite beam and the Matlab software program combining JC method,and the impact of random variables is analyzed on the sensitivity of deflection reliability.The results show that calculation span and boundary condition have greater influence on the reliability,the calculation mode's uncertain coefficient has impact on the sensitivity of deflection reliability.