钢梁栓焊混合连接节点性能试验

Experimental Study on Flange Bolted welded Connection for Steel Column beam

摘要:

为实现工业化建筑快速施工的目标，设计了钢梁现场翼缘对接栓 焊混合连接节点.此节点在拼接处梁的下翼缘及近下翼缘的腹板上焊接法兰板，通过高强度螺栓连接；法兰板上部焊接加劲板，加劲板同时焊接于梁腹板上；腹板采用高强度螺栓连接，上翼缘待腹板和下翼缘安装完成后现场俯焊.为考察此节点在地震作用下的极限承载力、滞回性能及失效模式等性能，设计了3个试件进行单向及低周往复加载试验.试验结果表明，梁节点具有很好的延性转动能力，转角最大可达0.095 rad, 延性转动后摩擦型螺栓变成承压型高强度螺栓，强度还有一定的提高.最终节点失效是由于连接法兰板的螺栓松动，法兰板缝隙发展，导致螺栓滑丝松动而失去承载能力.

Abstract:

In order to facilitate the construction of industrial buildings, a new type of splice joint, named flange bolted welded hybrid joint, was designed to splice I shape beam to steel connections. The flange, welded with the bottom beam flange as well as the web close to bottom flange, was jointed by high strength bolt. Stiffening plate was welded at top of the flange. While downhand welding and high strength friction grip bolts were used for the top beam flange and the beam web, respectively. Monotonic and reversed cyclic loading tests were conducted on three specimens of this innovative joint to investigate its load bearing capacity, energy dissipating capacity and failure modes. The experimental data indicate that the joint has high load bearing capacity and great rotational ductility with the maximum plastic rotational angle up to 0.095 rad. The strength of specimen will be increased after rotational ductility for the reason that its high strength friction grip bolts transform to bearing type. The failure mode is due to the looseness of bolts connecting flange plate as well as the development of gap between the flange plate.