An Experimental study of longitudinal shear behavior for eighteen YXB65-185-555 closed profiled steel sheetconcrete composite slabs was conducted. The influence of the slab thickness, the profiled steel sheet thickness and shear span on the longitudinal shear behavior of composite slabs was investigated. The ultimate load capacity, deformation and failure characteristics, the slippage between profiled steel sheet and concrete were obtained. The test results show that the longitudinal shear capacity is higher for the thicker composite slabs or the thicker profiled steel sheets, and longitudinal shear capacity is lower for the larger shear span. Longitudinal shear bond failure takes place for the composite slabs with smaller shear span, and bending and bending-shear bond failure occurs for the ones with larger shear span. Based on the formula suggested by Eurocode 4 and test results of longitudinal slide and load relationships, longitudinal shear bond coefficients m and k were defined with regression analysis. Test results achieved may provide a reference for the engineering application of this kind of composite slabs.%对18块YXB65-185-555闭口型压型钢板-混凝土组合楼板进行了纵向抗剪性能试验研究,考察了楼板厚度、压型钢板厚度以及剪跨等因素对组合楼板纵向抗剪性能的影响.得到了组合板的极限承载力、变形和破坏形态以及压型钢板与混凝土之间的滑移.试验结果表明:随着组合板和压型钢板厚度的增大,组合板的纵向抗剪承载力越大;剪跨越大,纵向抗剪承载力越小;剪跨比较小的试件主要发生纵向剪切粘结破坏,剪跨比较大的组合板主要发生弯曲破坏和弯曲剪切粘结破坏.基于欧洲规范4的建议公式,对试验结果进行线性回归得到了适用于该板型的压型钢板-混凝土组合楼板的纵向剪力粘结系数m、k,可为该种楼板的工程设计提供参考.
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