T形钢连接梁柱半刚性节点初始转动刚度计算公式

为了确定T形钢连接半刚性节点的初始刚度，分析T形钢连接梁柱节点的变形特征.以节点处与梁端受拉侧翼缘相连的T形钢为研究对象，将T形连接件翼缘受力视为简支梁，建立T形钢连接节点在弹性阶段的初始转动刚度计算模型，推导初始转动刚度的计算公式.采用数值模拟和已有试验数据，对所推导公式进行对比分析.结果表明，节点的初始转动刚度主要取决于T形钢连接件的翼缘厚度、T形钢翼缘上螺栓的位置和梁的高度，通过推导公式所得的初始刚度大于数值模拟和试验所得刚度.为了更加准确地预测节点初始转动刚度，引入刚度修正系数，分别采用修正后的刚度公式和已有的计算公式计算案例.结果表明，修正后的刚度公式能够更好地符合试验结果.

Initial rotational stiffness formula of semi-rigid joint with T-stub in beam-to-column connection

The deformation characteristics of the joint were analyzed in order to determine the initial stiffness of semi-rigid joint with T-stub. Then the flange of T-stub bolted on the tensile side of the beam section, which was deemed as main research object, was regarded as simply supported beam. The calculation model for the initial rotational stiffness of the joint during elastic phase was established, and the analytical formula of initial rotational stiffness was deduced. Numerical simulation and experimental data were employed for comparison with the results from the proposed formula respectively. Results show that the initial rotational stiffness of the joint mainly depends on the flange thickness of the T-stub, distance between bolts linking the flange of T-stub to steel column, and the height of the beam. The values calculated by the proposed formula are greater than those from numerical simulation and experiments. A stiffness modified coefficient was introduced into the analytical formula to predict the initial rotational stiffness more accurately. The results from modified formula applied for case studies accorded better with the experimental data than those from previous formula proposed by researchers.