钢筋混凝土箱梁受弯性能的比拟杆分析

基于截面换算的原理对现行分析箱梁受力性能的比拟杆法进行修正，得到考虑钢筋影响的比拟杆分析方法．通过三杆比拟和多杆比拟分析了混凝土箱梁在不同配筋情形下的弯曲应力，并用限元结果验证了修正的比拟杆法分析钢筋混凝土箱梁弯曲受力的适用性．结果表明：相同工况下比拟杆法和有限元法所得应力计算结果相近，且考虑钢筋影响后的计算结果与实测值更为接近，考虑钢筋影响才能反应实际应力状态；当板内钢筋均匀分布时，配筋率的变化基本不影响箱梁剪力滞大小．

The Bar Simulation Method of Load Performance inReinforced Concrete Box Girder

Based on the principle of section conversion,this paper has amended the bar simulation method which is presently used in analysis of load performance of box girder,and proposed a new method which has taken consideration for the influence of reinforcement.By using the multi-bar and three-bar simulation analysis method respectively,the authors calculated the stress of the concrete box girder models in bending with different reinforcement ratio,and also compared the results from the new method with those from finite element method.It indicated that the results by the new method is more consistent with measured value and the reinforcement ratio has no effect on the shear lag of box girder if reinforcement is uniformly located in the relative plate of the box girder.