钢-混凝土组合连续梁抗弯性能

Bending resistance of steel-concrete composite continuous beam

为了准确分析钢-混凝土组合梁的抗弯性能,考虑到钢-混凝土组合梁交界面处通过剪力连接件部分相互作用的特点,基于接触理论推导了一种新的复合梁单元有限元刚度方程。考虑到钢-混凝土组合梁交界面处的剪切滑移效应,在交界面上采用两种位移模式以模拟钢梁上缘和混凝土下缘的位移差。通过将计算结果与试验结果对比,表明该计算公式是合理可信的。利用复合梁单元能够有效计算在竖向荷载作用下组合梁的挠度、应变和交界面处剪切滑移应变差等指标沿梁纵向的分布,并且能直接分析栓钉对组合梁抗弯性能的影响,还可以将复合梁单元推广到变截面钢-混凝土组合梁和预应力钢-混凝土组合梁的计算中。

To analyze the bending resistance of the steel-concrete composite beam（CB） accurately,a new finite element stiffness equation of the CB in the structure under the vertical loads was derived based on the contact theory.The element considers the shear-slip effect between the shear connector parts located at the interface of the steel-concrete CB and simulates the displacement difference between the steel upper surface and the concrete lower surface by using two displacement modes in the interface.The calculated results were compared with the test results and good agreement showed the suggested method is reasonable and believable.Using the CB element,it is possible to calculate effectively the longitudinal distributions of the bending deflection,the strain,and the sheer-slip strain difference in the interface of the CB under the vertical loads,to analyze the effect of the shear stud on the bending resistance of the CB.The suggested CB element can be extended to the calculation of the variable cross-section steel-concrete CB and the prestressed steel-concrete CB.