T形钢连接梁柱节点的试验和抗剪计算方法研究

通过对4个中空夹层钢管混凝土柱-钢混凝土梁采用高强螺栓T形钢连接的组合节点的低周反复荷载试验,研究了其典型破坏形态及节点域的剪力-剪切变形骨架曲线;在此基础上,对其节点域的传力机理和抗剪性能进行了理论全过程分析,分别建立了节点域钢管腹板、钢管翼缘和夹层混凝土的剪力-剪切变形的三折线模型,并根据剪切变形协调条件对三部分曲线进行简化后叠加,由此得到整个节点域的屈服抗剪承载力和极限抗剪承载力的计算公式,并将理论计算结果与试验数据进行对比,二者整体吻合较好.

Experimental Research on and Calculation Method for the Shear Strength of Composite Column-to-beam Connections through T-stubs

The results of an experimental research involving the testing of four moment-resisting connections under antisymmetric loads at the cantilever ends of beam were presented. The test specimens modeled the interior joint of a moment-resisting frame consisting of concrete-filled double skin tubular column and steel beams with reinforced concrete slab using high-strength bolts and T-stub connectors. And the typical failure modes and shear-deformation skeleton curves were evaluated. Based on the experimental results, the force mechanism and the total process of shear performance on the panel zone were analyzed. Three trilinear shear-deformation relationship models for the web of steel tube, the flange of steel tube and the concrete core were proposed. By simplifying and adding these three models together in the condition of consistent shear deformation, the calculation formulas of the yield and ultimate shear strength of the joints were established. The formulas were used to calculate the shear strength of the panel zone of four joints, and the results calculated with the proposed formulas agreed well with those of the tests.