中文摘要：

为研究T形件焊接加强型节点卷边PEC柱-钢梁组合框架层间倒塌机理，按1:2缩尺设计制作了1榀组合框架中间层子结构模型试件并进行拟静力试验，从试件受荷过程分析了组合框架中间层子结构的滞回特性、承载力、抗侧刚度、耗能能力、变形模式和倒塌破坏机构等抗震性能．研究结果表明：T形件焊接加强型连接方式增强了节点连接的刚度，实现了梁塑性铰位置远离节点区和结构梁端塑性屈服耗能的设计目标；T形件预拉对穿螺栓连接有效实现了节点域混凝土斜压带传力模式，相应降低了节点区的抗剪需求，更好满足了“强节点”的抗震要求；试件沿高度刚度分布均匀，试件整体水平位移表现为理想的倒三角弯剪型变形模式；试件结构的破坏模式为中间层T形件端部梁截面形成塑性铰的塑性倒塌机构，对应层间剪切角和节点连接转角均超过大震层间侧移限值1/30，且试件承载力未出现明显下降趋势，试件结构具有良好的抗倒塌性能．

英文摘要：

To investigate the collapse mechanism of innovative PEC column—steel beam composite frame with welded T-stubstrengthened connection, a 1:2 scale test specimen of inter-story substructure was designed and fabricated. The test of the specimenwas conducted under low-cycle reserved loading to study its seismic performances, including the hysteretic property, loading carryingcapacity, lateral stiffness degradation, energy dissipation and failure mode. Test results indicated that the stiffness of connection isstrengthened and the design target as plastic hinge forming location away from beam end is achieved by welded T-stud connection;the force-transfer mechanism of concrete equivalent strut in the panel zone is captured due to pre-tension penetrating bolts and t-stub;the lateral stiffness is evenly distributed along the height of the specimen lead to the ideal inverted triangle pattern of flexure-sheartype for the specimen; the failure mode occurred primary induced by the plastic hinge of beam near end of T-stub, and interstory driftand connection rotations all surpass the drift limit(1/30) of maximum consideration earthquake, while the load-carrying capacity isnot descending obviously, and correspondingly the specimen owns excellent collapse prevention capacity.