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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.
In order to study the mechanism of the collapsing of PEC column-steel beam composite frame with T-piece welded reinforced joints, a 1 2 2-foot scale intermediate layer substructure model specimen was designed and fabricated and subjected to quasi-static test. The hysteretic behavior, bearing capacity, lateral stiffness, energy dissipation capacity, deformation mode and collapse failure mechanism of the composite substructure were analyzed from the process of specimen loading. The results show that: T-shaped welding strengthened type The connection mode enhances the rigidity of node connection and achieves the design goal of plastic yield energy dissipation of beam plastic hinge away from node area and structure beam end. Mode, correspondingly reduced the shear resistance requirements of the node area, and better meet the seismic requirements of “strong node ”; the specimen along the height stiffness distribution, the overall horizontal displacement of the specimen showed the ideal inverted triangle bending shear deformation mode ; The failure mode of the specimen structure is the plastic collapse mechanism which forms the plastic hinge at the end of the middle T-beam, and the corresponding inter-layer shear angle and node connection angle exceed the lateral displacement limit of 1/30 Test piece bearing Clear downward trend does not appear, the test piece structure having good resistance to collapse performance.