岳哲萌 王啸霆 王涛

摘 要：通過一按照现行中国规范中“强节点”原则设计的高层框架剪力墙结构中提取出的3个不同位置的梁柱节点缩尺模型的拟静力试验，研究框架结构中不同位置梁柱节点的抗震性能，试验采用柱端加载，同时考虑了楼板对节点抗震性能的影响，分析其延性、刚度、承载力、耗能等性能指标，并对裂缝开展情况做了详细记录，与构件的力学指标进行比对，将损伤状态与力学指标对应起来，为完善钢筋混凝土框架梁柱节点的易损性曲线及为相关结果信息提供试验依据。试验发现：框架结构不同位置的节点破坏形式不同，底层节点破坏形态表现为弯曲破坏，破坏主要集中在梁端和柱脚，节点区未发生明显破坏现象，而顶部节点节点区发生剪切破坏。结果表明：极高水平的节点区强节点系数和柱端弯矩放大系数可以完全避免梁柱节点区出现需要修补的损伤，实现节点弹性化，也不会削弱组合件的延性。

关键词：框架剪力墙结构;梁柱组合件;强节点弱构件;抗震性能

中图分类号：TU375.4;TU317 文献标志码：A 文章编号：2096-6717（2021）03-0093-08

Abstract： Through a quasi-static test of three beam-column joint scale models extracted from the high-rise frame-shear wall structure designed according to the "strong joint" principle in the current national code， the seismic performance of beam-column joints at different positions in frame structures is studied. The test adopts column end loading， considering the influence of the floor slab on the seismic performance of the joint， and analyzes its ductility， stiffness， bearing capacity， energy consumption and other performance indicators. During the test， the development of the cracks was recorded in detail and compared with the mechanical indexes of the components to relate the damage state with the mechanical indexes. The test provides test basis for improving the vulnerability curve and relevant consequence information of the reinforced concrete frame beam-column joints. It is found that the failure modes of the joints at different positions of the frame structure are different. The failure modes of the bottom nodes are shown as bending failure， and the failure is mainly concentrated in the beam ends and column feet toe. No obvious failure in the joint area， while the shear failure occurs in the top joint area. The test results show that the strong joint coefficient and the column end bending moment amplification factor at an extremely high level can completely avoid the damage that needs to be repaired in the beam column joint area， achieve the elasticity of the node， and will not weaken the ductility of the assembly.

Keywords：frame-shear wall structure; beam-column assemblies; strong joint weak component;seismic performance

钢筋混凝土框架结构是目前最普遍的结构形式，而节点是框架结构中传力的枢纽，起着传递和分配内力及保证结构整体性的作用。在地震中，节点往往承受很大的剪力作用，极易发生剪切脆性破坏。钢筋混凝土框架梁柱节点的试验研究从20世纪60年代末开始，学者们对不同类型梁柱节点的抗震性能进行了大量试验研究。……