考虑薄膜效应的钢筋混凝土双向板承载力分析

Load-carrying capacity analysis of reinforced concrete two- way slabs considering membrane effect

为了简单地确定钢筋混凝土双向板荷载-位移关系曲线,基于塑性铰线理论,考虑受拉薄膜效应,提出三阶段分析模式,建立修正板块平衡法;同时,根据面向对象方法和板壳有限元理论,建立钢筋混凝土双向板非线性分析程序;采用上述两方法计算双向板荷载-位移关系曲线及极限荷载,并结合有限元程序,验证修正板块平衡法合理性.结果表明:与有限元方法相比,修正板块平衡法原理简单、精度满足要求,可用于确定混凝土双向板的荷载-位移关系及极限荷载.

To easily determine the load-displacement curve of reinforced concrete two-way slabs,the modified segment equilibrium method was established based on the yield-line theory,and the threestage mode was proposed,in which the tensile membrane effect was taken into account in this method.Additionally,the nonlinear procedure for modeling the behavior of reinforced concrete two-way slab was developed according to the object-oriented method and the theory of shell finite element.The two methods were used to predict the load-displacement curves and ultimate loads of reinforced concrete two-way slabs.The nonlinear program was also used to verify the rationality of modified segment equilibrium method.The result shows that compared with the finite element model,the modified segment equilibrium method is simple and easy to calculate,and it is capable of predicting the load-displacement curves and ultimate loads of reinforced concrete two-way slabs with reasonable accuracy.