狗骨式型钢高强混凝土边节点抗震性能试验研究

EXPERIMENTAL RESEARCH ON SEISMIC BEHAVIOR OF FRAME SIDE JOINTS IN STEEL HIGH-STRENGTH REINFORCED CONCRETE WITH DOG-BONE CONNECTIONS

为了研究狗骨式型钢高强混凝土(HSRC)框架边节点的抗震性能,对9个边节点试件进行低周反复荷载试验。试验结果表明:设计合理的狗骨式型钢高强混凝土框架边节点具有良好的位移延性和滞回特性;轴压比小的试件,其节点的滞回曲线较丰满,骨架曲线较平缓,延性与耗能能力相对较好;在轴压比相等或相近的情况下,对梁型钢采用狗骨式削弱的试件较普通试件具有更好的延性性能和耗能能力,位移延性系数提高幅度为10%～25%;对节点附近梁端型钢翼缘采取狗骨式削弱,能够将框架梁的塑性铰从梁端根部转移到削弱部位,从而有效地提高节点的抗震性能,达到延性设计的目的。

The seismic behavior of frame side joints of the steel high-strength reinforced concrete with dog-bone type weakening has been investigated based on the experiment and analysis of nine joint specimens, under cyclic loading. The test results show that well designed HSRC frame joint with dog-bone type weakening has good displacement ductility and hysteretic behavior. The joint, whose axial compression ratio is small, hysteretic curve is full and skeleton curve is gentle, has a better ductility and energy dissipation. In condition of the same or close axial compression ratio, the seismic performance, including the ductility and energy dissipation capacity of the joint with dog-bone type weakening is clearly superior to that of the ordinary joint, and the displacement ductile coefficient is increased by 10% to 25%. When the dog-bone type weakening is taken on the flanges of the steel at the beam end near the joint, the plastic hinge of the beam may be transferred from the root of beam end to the weakened position, thus the seismic behavior of the joints may be improved effectively and the ductile design can be realized.