高温下栓钉剪力连接件受力性能的试验

为研究高温下栓钉的抗剪性能,对24个栓钉推出试件进行了高温下推出试验.试验考虑了平板、压型钢板肋与钢梁垂直和压型钢板肋与钢梁平行三种混凝土板型式,考察了栓钉在不同温度下不同混凝土板型式中的受力特点和破坏模式.试验结果表明:平板混凝土试件和压型钢板肋与钢梁平行的试件均为焊缝上侧栓钉剪断破坏,而压型钢板肋与钢梁垂直的试件在温度较低时为混凝土拔出破坏,温度较高时转为栓钉剪断破坏.另外,三种混凝土板型式中栓钉的抗剪承载力和刚度均随温度的升高而降低,且平板混凝土试件和压型钢板肋与钢梁平行的试件中栓钉的承载力比压型钢板肋与钢梁垂直的试件中栓钉要高.通过对试验数据的拟合,提出了高温下栓钉抗剪承载力的计算公式.

Experimental Studies on the Behaviour of Headed Stud Shear Connectors at Elevated Temperatures

Twenty four push out tests were carried out in Tongji University to investigate the performance of the shear stud at elevated temperatures. Three different floor arrangements including solid slabs, composite slabs with trapezoidal steel sheeting parallel to the steel beam and composite slabs with trapezoidal steel sheeting perpendicular to the steel beam, were considered in tests. It was observed in the test that the predominant mode of failure for the solid slabs and profiled slabs with trapezoidal steel sheeting parallel to the steel beam was headed stud shear failure while the predominant mode of failure for the profiled slabs with trapezoidal steel sheeting perpendicular to the steel beam was concrete cracking failure at low temperatures and stud shear failure at high temperatures. Also, the ultimate load in solid slabs was generally higher than that in the profiled slabs. In addition, the ultimate load and stiffness decreased with increasing temperature for all slabs. By analyzing the test results, an empirical equation was proposed to calculate the shear capacity of studs at high temperatures.