腹板开洞连续组合梁受力性能 试验研究与有限元分析

为研究腹板开洞连续组合梁的受力性能,对6根组合梁试件进行了试验研究与有限元分析,其中5根为腹板开洞梁,1根为腹板无洞梁。研究内容为组合梁极限承载力、混凝土板和钢梁受力全过程的截面剪力分布规律。结果表明:与腹板无洞组合梁相比,腹板开洞使组合梁的极限承载力得到明显削弱;洞口范围内混凝土板截面承担的剪力随着荷载的增加而不断增大;而在无洞梁段,钢梁承担的剪力比混凝土板承担的剪力要大,说明现行《钢结构设计规范》有关组合梁抗剪计算的相关条文已不适应于腹板开洞组合梁。

Experimental Research and Finite Element Analysis on Mechanical Behavior of Continuous Composite Beams with Web Openings

In order to investigate the mechanical behavior of continuous composite beams with web openings, six composite beams,in which five with openings and one without web openings, were studied. The research contents include three parts as follows: bearing capacity and shear distribution of composite beams in the hole process of loading. The results show that: compared with beams without web openings, beams with web openings have a significant decrease in load carrying capacity; The shear force at the cross-section of a concrete slabs increasing with the increase of load in the web openings region, but the shear force at the cross-section of a steel beam is more larger than a concrete slabs in the region of beams without web opening. It also shows that the relevant provisions of shear calculation in Code for Design of Steel Structures can not meet of beams with web openings already.