高性能耐火钢高强度螺栓接头高温受剪性能试验研究

为促进高性能耐火钢材设计理论发展与工程应用,对采用不同型号高强度螺栓的10个高强度螺栓连接接头进行了不同温度条件下的受剪试验,其中包含4个采用普通高强度螺栓的连接接头以及6个采用BFRW10耐火高强度螺栓的连接接头,连接板均采用WGJ高性能耐火钢.试验研究了常温下螺栓接头的摩擦面抗滑移系数、不同温度下螺栓接头的荷载-位...

Experimental study on shear performance of high-strength bolted connections fabricated from high-performance fire-resistant steel at elevated temperature

To facilitate the design theory improvement and engineering practice of high-performance fire-resistant steel, the shear performance of ten bolted joints fabricated with different types of high-strength bolts was tested under different temperature conditions, including four specimens using ordinary high-strength bolts and six specimens using BFRW10 high-strength fire-resistant bolts. The connection plates were manufactured from WGJ high-performance fire-resistant steel. The friction coefficients at room temperature, load-displacement relation, resistance reduction factor and failure mode of the bolted connections under different temperature were investigated. It is found that with the increasing temperature, the failure mode of the bolted connections changes from compressive failure on the bolt hole to shear failure of the bolt rod.The slip load and ultimate load of the bolted connections fabricated from fire-resistant high-strength bolts are larger than those of ordinary high-strength bolts at high temperatures. The experimental ultimate loads are compared with the calculation results from EC3 method and strength-reduction method of high-strength bolted joint in high temperature, which show over conservative of current codes in predicting the ultimate load of such fire-resistant bolted joints. Meanwhile, suggestions were made to establish overall reduction factors for such connections in further discussions.