滑移效应对预应力组合梁承载能力的影响

Influence of Sliding Effect on Bearing Capacity of Prestressed Composite Beam

承受外荷载时,预应力组合梁混凝土翼板和钢梁的交界面处会发生相对滑移,对其受力性能会产生不利影响。在考虑界面滑移和预应力增量的前提下,分析预应力组合梁弹性抗弯性能,获得了预应力组合梁弹性抗弯承载能力和挠度的计算方法,并将计算值与实测值进行了对比分析。结果表明,考虑界面滑移和预应力增量时,弹性抗弯承载能力和挠度的计算结果更接近实测值,且偏于安全。

The interface between the concrete flange and steel beam of prestressed composite beam has relative slip under the external loading, which has unfavourable impact on its mechanical performance. Considering the effects of both interface slip and prestressed increment, the elastic flexural performance of prestressed composite beam were analyzed. And then the calculation method of elastic flexural hearing capacity and deflection was obtained. Comparing the calculated values and measured values, the results show that when considering effects of both interface slip and prestressed incre- ment, elastic flexural bearing capacity and deflection calculation is more close to the measured values, and it is more safety.