宽肢组合异形柱-钢梁节点抗震性能试验研究

为研究适用于高层钢结构住宅体系的组合异形柱框架结构的翼缘加强型节点的抗震性能,设计了两种不同构造形式的足尺节点试件,即格构式宽肢组合异形柱节点和实腹式宽肢组合异形柱节点,并进行拟静力试验,研究了该类节点的破坏形态、滞回性能、承载能力、梁端转角、延性及耗能能力。试验结果表明：2个节点最终均在加强件端部发生了翼缘开裂而破坏;节点的受弯承载力是梁端全截面塑性承载力的1.10~1.13倍;钢梁转角是梁端总转角的主要组成部分,节点区转角只占梁端总转角的1.0%~1.8%,柱变形转角占9.2%~13.0%;节点的位移延性系数约为2.33~2.38,黏滞阻尼系数约为0.264~0.267。此外,2个节点的承载能力基本相当,格构式宽肢组合异形柱节点的抗震性能指标相对实腹式宽肢组合异形柱节点较好;但与传统翼缘加强型节点相比,其延性和耗能能力略有降低。

Experimental study on seismic behavior of steel beam towide-flange specially-shaped composite column connections

To investigate the seismic behavior of flange strengthened connections used in high-rise steel frame structures with specially-shaped columns, two full-scale connections with different configurations were designed, including one with a lattice wide-flange specially-shaped composite column, and the other with a solid composite column. Cyclic loading tests were undertaken to examine the failure modes, hysteretic behavior, ultimate capacities, beam end rotation, ductility, and energy dissipation of the two connections. The test results indicate that both the connections fail due to cracking within the beam flange adjacent to the end of the strengthening plates. Moment resistance of the specimens reaches 1.10-1.13 times of the full plastic moment capacity. The beam rotation resulted from flexure is the main component of beam-end rotation, whilst the panel zone rotation contributes only 1.0%-1.8%, and the column rotation contributes 9.2%-13.0%. Displacement ductility coefficient of the specimens is about 2.33-2.38 and the equivalent viscous damping coefficient is about 0.264-0.267. In addition, it is found that the ultimate capacities of the two connections are essentially equal, while other seismic performance of the connection with lattice wide-flange specially-shaped composite column is relatively better than the connection with solid composite column. Generally, the ductility and energy dissipation of this new type of connections are a bit lower compared with conventional beam-to-column with flange-strengthened connections reported previously.