钢-混凝土组合扁梁受弯性能数值模拟研究

Numerical Simulation Research on Bending Behavior of Steel-Concrete Composite Flat Beam

国内常用组合楼盖有SP预应力混凝土叠合楼板和深肋压型钢板组合楼板,由于该两种组合楼盖体系存在钢梁外露、楼盖厚度大、组合扁梁下翼缘不平整等问题,为此本文提出一种新型双向叠合空心楼板组合扁梁楼盖。为探究新型组合扁梁楼盖性能,基于新型组合扁梁楼盖试验结果,利用ABAQUS建立钢-混凝土组合扁梁受弯性能模型。有限元分析结果表明:本文有限元模型与试验结果吻合较好;腹板开蜂窝孔对钢梁承载力削弱明显,开圆孔影响较小;钢-混凝土组合扁梁承载力与实腹钢梁相比提高71.8%~100%,与钢梁和混凝土承载力值简单叠加相比提高7.5%~103.2%;钢与混凝土楼板能够协同工作,达到1+1>2的效果。

The commonly used composite floor system in China are SP prestressed concrete composite floor system and deep rib profiled steel plate composite floor system.Due to there are some disadvantages in the two composite floor systems,such as the exposure of the steel beam bottom flange,thick slab,and uneven bottom rib of composite slab,a new steel-concrete composite flat beam with concrete hollow two-way slab has been proposed.In order to investigate the structural behaviors of the proposed composite flat beam,based on experiments referring to the new proposed composite flat beam,the bending performance models of steel-concrete composite flat beam are established using ABAQUS.The finite element analysis shows the results that:the proposed finite element models are in good agreement with the experimental results;the bearing capacity of steel beam is weakened obviously with web opening honeycomb hole,while there is no significant change of the bearing capacity comparing the steel beam with circular hole;the bearing capacity of steel-concrete composite flat beam is 71.8%~100% higher than that of solid web steel beam and 7.5%~103.2% higher than that of the superposition of steel beam and concrete slab;the steel beam can cooperate with the concrete slab well and the 1+1>2 combination effect can be achieved in the proposed composite slab.