带开孔板剪力键的钢-UHPC组合板受弯性能试验研究及数值模拟

研究了一种采用开孔板(PBL)剪力键的钢-超高性能混凝土(UHPC)组合板，可用作大跨度桥面板或楼板。基于某特大跨度组合梁斜拉桥的桥面板设计，完成了3块钢-UHPC组合板和1块钢-C60组合板的足尺模型试验，探究剪力连接件种类、数量和混凝土材料对组合板受力性能的影响。试验结果表明:在集中荷载作用下，钢-UHPC组合板发生典型的弯曲破坏，而钢-C60组合板发生冲切破坏；钢-UHPC组合板的承载力、刚度和延性均远优于相同厚度的钢-C60组合板；在3块钢-UHPC组合板试件中，含较多开孔板剪力键的试件表现出最佳的受力性能。基于ABAQUS建立钢-UHPC组合板的精细有限元模型，模型的预测结果与试验得到的荷载-位移曲线吻合良好，进一步利用有限元模型开展了参数分析。

EXPERIMENTAL AND NUMERICAL INVESTIGATIONS ON THE FLEXURAL BEHAVIOR OF STEEL-UHPC COMPOSITE SLABS WITH PERFOBOND RIB SHEAR CONNECTORS

A new type of steel-ultra-high performance concrete (UHPC) composite slab with perfobond rib shear connectors (PBL shear connectors) is studied, which can be used as large-span bridge decks and floors in buildings. According to the deck system of an ultra-long-span composite cable-stayed bridge, full-scale tests on three steel-UHPC composite slabs (SUCS) and a steel-C60 composite slab (SCCS) were conducted. The influence of the number and type of shear connectors were investigated. The experimental results demonstrate that, subjected to concentrated load, typical flexural failure of SUCS occurred while punching failure of SCCS occurred; that the SUCS possessed much higher ultimate capacity, rigidity and ductility than the SCCS with the same thickness did; that the specimen with sufficient perfobond rib shear connectors exhibited the best mechanical performance among the three SUCSs. Elaborate finite element models of the SUCSs were established in ABAQUS, which can reproduce the load-deflection curves obtained from the tests. Parametric study is conducted adopting the established finite element models.