钢-混凝土组合梁收缩效应分析

分析了混凝土收缩效应对组合梁的影响．从混凝土的收缩特性出发,假定一阶线性的剪力流模式,并转换为轴力流的概念,对组合梁运用解除约束法得到新的结论：混凝土收缩引起的组合梁挠曲效应等价于沿梁纵向施加一均布荷载．比较了重力效应和收缩效应,为设计中衡量后者提供了荷载等代参数．最后分析了剪力连接件区域的破坏模式,理论值和实验结果吻合良好．

THE ANALYSIS OF SHRINKAGE EFFECTS IN STEEL-CONCRETE COMPOSITE BEAMS

To analyse the shrinkage effect on the beams,presents a one-order linear shear flow mod el,which derives from the shrinkage feature the concrete. The effect istackled by a lack of fit approach using the decribed new model and the conclusion is obtained:The deflection of a composite beam due to shrinkage is that caused by a uniformly distributed load along the longitudinal length. Comparing the effect of the dead load and the shrinkage, a load-equivalent parameter measuring the longitudinal the latter has been to enrich the present design techniques. Finally, the local failure model near the shear connector is studed. The theoretical result is validated against tests.