大跨半钢板混凝土简支梁承载力性能试验研究

EXPERIMENTAL INVESTIGATION ON LOAD-BEARING CAPACITY OF LARGE-SPAN HSC SIMPLY SUPPORTED BEAM

为了研究大跨半钢板混凝土组合梁的承载力和变形性能,对一个1∶3缩尺的大跨简支梁试件进行了静载试验研究。通过分析试件在加载过程中的挠度、应变和裂缝的发展,研究了此类构件的受力特点和破坏形态,结果表明该类型构件中的钢板、混凝土和钢筋能够很好的协同工作,整个构件具有较高的承载力和刚度,同时表现出很好的延性。最后,通过对比实测数据和理论计算结果,检验了现行规程中组合梁正截面抗弯承载力和短期刚度的计算公式,为工程设计提供参考。

In order to study the load bearing and deformation capacity of a large-span half steel-plate-reinforced concrete(HSC) beam, a static test of a scaled down(1∶3) simply supported specimen is conducted. The mechanical characteristics and damage process of the HSC specimen are investigated by analyzing the development of the deflection, strain and fracture during loading process. Good combination action is observed during the test in steel plates, reinforcing bars and concrete in HSC beam; and the specimen has good mechanical properties of high bearing capacity, large stiffness and high ductility. At last, the calculation formulae for the bending capacity and short-term stiffness of the composite beam in existing codes are examined via the experimental results and theoretical analysis, which provides a reference for engineering design.