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为研究新型部分充填式钢箱-混凝土组合梁裂缝开展、局部屈曲过程和竖向抗剪强度,对3根不同配筋率的试验梁进行了两点对称式反向加载试验,得到了试验梁的荷载-跨中挠度曲线、跨中应变分布曲线和剪应变分布曲线,分析了混凝土翼板配筋率和充填区混凝土对组合梁负弯矩区抗剪承载力的影响.通过塑性理论分析推导出抗剪承载力计算公式,计算值与试验值吻合良好.结果表明:在负弯矩作用下,充填区混凝土承担了截面的部分剪力,翼板区纵向钢筋抑制了混凝土翼板开裂,横向钢筋对剪力连接件起到约束作用;以上各项因素共同提高了组合梁的局部稳定性及抗剪承载力.
In order to study the crack initiation, local buckling process and vertical shear strength of the newly-type partially filled steel box-concrete composite beams, two symmetrical reverse loading tests were carried out on three kinds of test beams with different reinforcement ratios. The experimental beams The influence of the ratio of concrete reinforcement on the shear strength of composite beams to the shear strength of composite beams in negative bending moment zone is analyzed.According to the analysis of plasticity theory The results show that under the action of negative moment, the concrete in the filling area takes part of the shear force of the section and the longitudinal reinforcement in the wing area suppresses the cracking of the concrete wing, and the transverse direction Reinforcing steel bars play a restraining role on the shear connectors. The above factors together improve the local stability and shear strength of the composite beams.