预应力钢-混凝土连续组合梁抗弯性能试验

Test for flexural behavior of pre-stressed steel concrete continuous composite beams

为研究预应力钢-混凝土连续组合梁的抗弯性能和内力重分布情况,设计了7根简支组合梁、3根连续组合梁以及1根连续纯钢梁进行抗弯性能试验。试验结果表明:预应力连续组合梁抗弯性能良好,对负弯矩区的混凝土翼板施加预应力能明显提高组合梁的截面刚度,减缓连续组合梁的开裂,同时也降低了截面滑移;预应力筋内力增量与荷载、挠度均呈现较好的线性关系。

In order to study the flexural behaviors and the redistribution of the internal force of pre-stressed steel concrete continuous composite beams, seven simply supported composite beams, three continuous composite beams, and one continuous pure steel beam were designed to test for flexural behavior. The test results show that the flexural behaviors of pre-stressed continuous composite beams are good; the pre-stress added to concrete flange in the area of the hogging moment can improve the rigidity of the composite beam section, slow the crack of continuous composite beams, and reduce the section slip as well; and the internal force increment of pre-stressed rebar has a strong linear relationship with load and deflection.