开口型压型钢板-混凝土组合楼板抗弯承载力试验研究

Research on Flexural Capacity of Opened Profiled Steel Sheeting-Concrete Composite Slabs

通过4组不同跨度的开口型压型钢板-混凝土组合楼板的静力试验,研究了组合楼板的裂缝分布、破坏特征和滑移等情况。试验结果表明,开口型压型钢板-混凝土组合楼板破坏以纵向水平剪切黏结破坏形态为主。破坏时压型钢板与混凝土产生纵向剪切裂缝,端部发生相对滑移;设置栓钉和增加楼板的厚度可以提高其抗弯承载力,同时栓钉可以有效减少端部相对滑移;对于大跨度开口型压型钢板-混凝土组合楼板应适当配纵向受拉钢筋以提高其抗弯性能。采用全塑性理论计算的极限抗弯承载力大于试验结果,表明开口型压型钢板-混凝土组合楼板的极限承载力由水平纵向抗剪承载力控制。按极限抗弯承载力设计的开口型组合楼板偏于不安全。

Based on four groups of tests on opened profiled steel sheeting-concrete composite slabs,the crack distribution,failure modes and slippage of the composite slabs are studied.The tests results show the longitudinal shear failure is the dominated failure mode in the opened profiled steel sheeting-concrete composite slabs.Longitudinal shear cracks appear between steel sheeting and concrete when all the specimens fail.The end studs can improve the flexural performance of opened composite slabs and reduce relative slippage.The test results also show that longitudinal tensile reinforcement and increasing the thickness of slabs can enhance the bearing capacity of opened composite slabs.Experimental results of flexural bearing capacity is less than the calculated results using the plastic flexural theory,and ultimate bearing capacity of opened composite slabs is dominated by the longitudinal shear strength.Therefore,designing the opened steel sheeting-concrete composite slabs based on ultimate flexural bearing capacity is not safe enough.