压型钢板-高延性水泥基材料组合楼板纵向剪切性能及承载力研究

通过2组8个压型钢板-高延性水泥基材料(ECC)组合楼板静力加载试验，研究上述试件破坏模式、承载力、刚度、应变分布及滑移等受力性能。试验结果表明：峰值荷载时，端部设置栓钉的压型钢板-ECC组合楼板试件滑移值较大，达到峰值荷载后，试件承载力下降平缓，表现为延性剪切破坏；而端部未设置栓钉的试件表现为脆性剪切破坏。分析了剪跨、压型钢板厚度、组合楼板截面高度及端部栓钉等因素对压型钢板-ECC组合楼板纵向剪切性能及剪切承载力影响规律。在试验研究基础上，分别基于欧洲规范(Eurocode-4)和组合楼板设计与施工规范(CECS273:2010)的m-k法，提出适用于压型钢板-ECC组合楼板的纵向剪切承载力计算公式，经比较分析计算结果与试验结果吻合较好。

INVESTIGATION ON LONGITUDINAL SHEAR BEHAVIOR AND BEARING CAPACITY OF PROFILED STEEL SHEETING AND ECC COMPOSITE SLABS

The static loading tests on the two groups of eight profiled steel sheeting and Engineered Cementitious Composite (ECC) slabs were conducted, and their failure mode, bearing capacity, stiffness, strain distributions and slip behavior were investigated. The test results show that: compared with the composite slabs specimens without end studs, the slip value of profiled steel sheeting and ECC composite slabs specimens with end studs is larger at peak load, after reaching the peak load, the bearing capacity of those specimens decreased gently, showing a ductile failure mode. In comparison, the composite slab specimens without end studs show a brittle failure mode. The effects of shear span, of profiled steel sheeting thickness, of composite slabs height, and of end studs on the longitudinal shear performance and on the bearing capacity of specimens were analyzed. According to the experimental results, the calculation method for the longitudinal shear capacity of profiled steel sheeting and ECC composite slabs was proposed based on the m-k method in Eurocode-4 and on Code CECS273:2010, respectively. The calculated results were in a good agreement with the experimental results.