Improvement of Plastic Deformation Capacity of Steel High-rise Buildings against Various Strong Ground Motions

为了评价钢结构高层建筑在长周期长持续地震动作用下直至断裂弯矩连接的变形能力，进行了一系列恒幅和变幅循环加载试验。定量分析了连接强度、焊接细节和楼板对变形能力的影响，提出了裂纹扩展预测方法，以评估连接断裂前的变形能力。提出了一种用厚法兰加固弯矩连接的方法，并通过实验验证了该方法的有效性

In order to evaluate deformation capacity of moment connections until fracture for steel high-rise buildings subjected to long-period long-duration ground motion, a series of constant and varying amplitude cyclic loading tests were conducted. The effect of strength of connection, welding details and floor slab on deformation capacity were quantitatively indicated and the prediction method to estimate propagation of cracks was proposed to evaluate deformation capacity until fracture of connection. A method to strengthen moment connections by thick flange is proposed and its effectiveness is experimentally indicated