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采用ABAQUS软件对小跨高比钢板-混凝土组合连梁内力分布进行了数值分析,通过改变连梁的跨高比、钢板厚度和纵筋配筋率,详细分析了不同参数对小跨高比钢板-混凝土组合连梁混凝土应力、纵筋轴向力、钢板内力分布规律的影响。结果表明,小跨高比钢板-混凝土组合连梁的钢筋混凝土部分承载机制类似于传统的钢筋混凝土连梁,并随着连梁跨高比的增大,对角压杆作用逐渐向桁架作用转化;对角压杆作用的存在将会给纵筋带来较大的轴向拉力,使得纵筋拉力向墙肢内纵筋末端累积;连梁纵筋配筋率对钢板剪力和弯矩影响很小,但钢板厚度对钢板剪力和弯矩影响较大;钢板轴力沿连梁跨度方向均受拉,拉力分布呈M形,连梁跨高比越大,钢板轴力越大,而随着纵筋配筋率的增大,钢板轴力逐渐减小;钢板受弯时截面受压区高度很小,远远小于受拉区高度,建议在受弯计算中不考虑钢板受压。
ABAQUS software was used to analyze the internal force distribution of the small span ratio concrete-filled composite beam. By changing the span-height ratio, the thickness of the web and the ratio of the longitudinal reinforcement, the effects of different parameters on the cross- Effect of concrete stress, longitudinal force of longitudinal reinforcement and internal force distribution of concrete composite beam. The results show that the load-carrying mechanism of RC beams with small span ratio steel-concrete composite beams is similar to the traditional RC beams, and with the increase of span-to-height ratio, the effect of diagonal compression bars gradually transforms to truss ; The existence of diagonal struts will bring greater axial tension to the longitudinal reinforcement so that the longitudinal reinforcement tensile force will accumulate to the end of longitudinal reinforcement in the wall; the influence of longitudinal reinforcement ratio on the shear and moment of steel plate But the thickness of the steel plate has a great influence on the shear and moment of the steel plate. The axial force of the steel plate is tensioned along the span of the connecting beam, and the distribution of tensile force is M-shaped. With the increase of the longitudinal reinforcement ratio, the axial force of the steel plate decreases gradually. When the steel plate is bent, the height of the compression zone is very small and far less than the height of the tension zone. It is suggested that the steel plate should not be taken into account in the bending calculation.