钢-混凝土预制板组合梁的组合性能

Experiment of the steel-full depth precast concrete panel beams

通过制作了12个推出试件,研究了栓钉连接件在不同工作环境下的抗剪承载力及其抗滑移性能;并对不同孔型、不同抗剪连接度的3根钢-混凝土预制板组合梁进行了静力性能试验,对比分析了钢-混凝土预制板组合梁的荷载-滑移、荷载-挠度、荷载-组合梁全截面应变及截面整体工作性能.结果表明:预留后灌孔为方孔推出试件的栓钉承载力比圆孔好;孔内填充混凝土强度对栓钉承载力影响很大,孔内混凝土强度高则栓钉承载力好;3根试验梁的截面应变分布满足平截面假定的要求,且均为弯曲破坏形式;组合梁具有良好的组合效应及受弯性能,完全抗剪连接的组合梁与部分抗剪的承载力接近,但完全抗剪组合梁钢梁与混凝土板界面间得滑移值明显小于后者.本文结果将增进对钢-混凝土预制板组合梁的理解和认识,为今后改进该类型梁工程设计提供有价值的参考.

Test of twelve push - out specimens under different working conditions to compare and analyze the capacity and the corresponding slip value of the stud shear connector. Meanwhile, tests were also conducted on three composite steel - FDPCP （ Full - Depth Preeast Concrete Panel） beams with different groove and degree of shear connection to investigate the charaeteisties of load -displacement, load -deflection , load -strain of the total cross section and monolithic action of the entire cross section. The results show that, as to the two different kinds of grooves , the strength of the stud shear connectors of square push - out specimens is huger than that of circular specimens with the same condition; the strength of stud shear connectors in steel - concrete composite structure is decided by the strength of concrete surrounding the shear in the holes, with increasing concrete strength, the strength of stud shear connectors improve greatly; the composite steel - FDPCP beams fail in bending, plane section is maintained in composite beams throughout the testing process. The composite steel -FDPCP beams have some merits ： good bearing capacity, good anti - bend capability, fast pile - driving pace and perfect work behaviors as a whole ; the ultimate flexural capacity of the composite steel - FDPCP beams with a full shear connection is close to that of a partial shear connection. The outputs of this study are very useful for further understanding of the characteristics of the composite steel - FDPCP beams, it is also expected that the results are valuable for the design of the composite steel - FDPCP beams.