中空夹层钢管混凝土柱与钢-混凝土组合梁节点抗震性能试验研究

Experimental study on seismic behavior of concrete-filled double skin steel tubular column and steel-concrete beam composite joints

以中空夹层钢管混凝土柱与带钢筋混凝土楼板的钢-混凝土组合梁采用高强螺栓及T形钢连接件构成的组合节点的抗震性能为研究对象,对6个十字形组合节点以梁端反对称加载的形式进行拟静力试验。试验中以柱轴压比、加劲肋、T形钢连接件尺寸、楼板厚度和楼板配筋率等为变化参数,研究该组合节点的破坏特征、滞回性能、抗剪性能、承载力衰减、刚度退化规律、耗能特性以及应变变化等力学性能。研究结果表明:柱内置钢管在增加柱受压承载力的同时可以有效增加节点核心区受剪能力,改善了节点整体受力性能;增大楼板配筋率(当1%≤ρ≤ρmax时)和减小柱轴压比(当n≤0.3时)能增强节点总耗能能力,但会降低节点延性且对节点承载力无明显提高作用;T形钢翼缘厚度和设置加劲肋对节点抗震性能影响较大。

The results of an experimental research involving the testing of six bolted moment-resisting connections under simulated seismic loading conditions were presented. The test specimens modeled the interior joint of a momentresisting frame consisting of concrete-filled double skin tubular column and H-shape steel beams with reinforced concrete slab using high-strength bolts and T-stub connectors. To investigate the seismic behavior of the composite joints, the failure modes, hysteretic performance, shear strength, bearing capacity degradation, rigidity degradation, energy dissipation and strain were evaluated in detail. The test parameters varied including the axial load level on the column, the stiffener, the size of T-stub, the thickness of slab and the reinforcement ratio in slab. The experimental results indicate that the compressive capacity in column and the shearing capacity in joint are improved by the inserted tube. In some extent, the increase of reinforcement ratio in slab （ 1% ≤ p ≤ Pmax ） and the decrease of the loading level on the column （ n ≤0. 3 ） will improve the total energy dissipation and reduce the ductility of joint, without obvious influence on the joint the bearing capacity. The seismic behavior of joint will be affected by the thickness of T-stub flange and the stiffener.