大跨度压型钢板-混凝土组合楼板粘结性能试验研究

Experimental study on bond behavior of large⁃span concrete composite slab with profiled steel sheeting

为研究大跨度压型钢板与混凝土组合楼板的粘结性能,以确定工程设计用的纵向剪切极限应力设计值,开展了6m足尺构件的受弯试验。试验共设计了两组试件,压型钢板的厚度分别为0.88mm和1.13mm,楼板跨度净距为6m。每组试件均由1个静载大跨度试件、2个动载大跨度试件和1个静载短跨度试件组成,并基于欧洲规范计算了每个试件的纵向剪切极限应力设计值。结果显示,循环荷载疲劳动态加载不影响组合楼板的最终承载力和破坏模态。压型钢板的厚度对纵向剪切承载力影响较大,且纵向剪切极限应力设计值的提高幅度大于压型钢板厚度的增加比例。1.13mm厚度的压型钢板相较于0.88mm的压型钢板,厚度增加28%,纵向剪切承载力提高约60%。考虑支座摩擦力影响,基于试验得到的纵向剪切极限应力设计值会减少7%~10%。得到的纵向剪切极限应力设计值可用于跨度为6m及以内的压型钢板-混凝土组合楼板的剪切粘结承载力设计。

In order to study the bond behavior of large-span concrete composite slab with profiled steel sheeting,and to determine the design value of longitudinal shear strengh for engineering design,the bending test of 6m full-scale members was carried out.Two groups of specimens were designed in the test.The thickness of the profiled steel sheeting was 088mm and 113mm respectively,and the net span of the floor was 6m.Each group of specimens is composed of one static load large-span specimen,two dynamic load large-span specimens and one static load short-span specimen,and the design value of longitudinal shear strengh of each specimen was calculated based on the European code.The results show that the cyclic loading fatigue dynamic loading does not affect the ultimate bearing capacity and failure mode of the composite floor.The thickness of the profiled steel sheeting has a great influence on the longitudinal shear bearing capacity,and the increase of the design value of longitudinal shear strengh is greater than the increase of the thickness of the profiled steel sheeting.Compared with the 088mm profiled steel sheeting,the thickness of the 113mm profiled steel sheeting increases by 28%,and the longitudinal shear bearing capacity increases by about 60%.Considering the influence of bearing friction,the design value of longitudinal shear strengh obtained based on the test will be reduced by 7%~10%.The obtained design value of longitudinal shear strengh can be used for the design of shear-bond bearing capacity of concrete composite slab with profiled steel sheeting with span length as large as 6m or less.