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为研究腹板开洞连续组合梁的承载力及受力性能,对5根腹板开洞组合梁和1根腹板无洞组合梁进行了试验研究,对7根组合梁进行了有限元模拟计算.研究的变化参数为混凝土板厚、配筋率、洞口尺寸和洞口位置.结果表明:增加混凝土板厚度可以提高组合梁的承载能力,配筋率增加能大幅提高组合梁的变形能力.随着洞口宽度和高度的增加,组合梁承载能力相应减小,带洞跨挠度增大.洞口位置对开洞组合梁的承载力和变形影响较大,洞口布置在集中荷载作用点之外对组合梁受力比较有利.另外,开洞使混凝土板承担了大部分剪力,钢梁仅承担少部分的剪力.
In order to study the bearing capacity and mechanical performance of continuous composite beams with web openings, five composite beams with web openings and one web without holes were tested and the finite element simulation The results show that increasing the thickness of concrete slabs can increase the bearing capacity of composite beams, and the increase of reinforcement ratio can greatly improve the deformation capacity of composite beams. With the increase of the width and height of the hole, the bearing capacity of the composite beam decreases correspondingly, and the span flexibility of the hole increases. The location of the hole has a great influence on the bearing capacity and deformation of the composite beam with open hole. Beam force more favorable.In addition, the hole to make most of the concrete slab shear, steel beams only bear a small part of the shear.