钢筋混凝土框架后锚固梁柱抗震性能试验研究  

EXPERIMENTAL STUDY OF SEISMIC PERFORMANCES FOR POST-ANCHORED BEAM-COLUMN JOINTS IN REINFORCED CONCRETE FRAME

作　　者：高群[1] 俞伟根[1] 李家青[1] 肖飞[1] 韦芳芳[2] 

机构地区：[1]江苏省建筑科学研究院有限公司,南京210008 [2]河海大学土木与交通学院,南京210098

出　　处：《工业建筑》2015年第10期183-190,125,共9页Industrial Construction

基　　金：江苏省科学技术厅基础研究计划(自然科学基金)研究资助项目(BK2011836)

摘　　要：针对既有建筑结构改造工程实践中大量运用的钢筋混凝土梁柱后锚固结构,进行抗震性能试验研究。试件设计按照1∶2的比例综合考虑了框架顶层中节点接柱、边节点接柱接梁、中间层边节点接梁和中节点一次整浇几种工况;同时还考虑了直接植入主筋、增设附加筋加强和箍板焊接主筋加强几种后锚固方法。通过对不同节点处梁柱的裂缝情况、破坏形态、延性、耗能能力和刚度退化等规律的研究,得出一些结论。在接柱改造时,只要符合强柱弱梁、强节点弱构件和植筋深度的要求,节点承载力就不会因接柱而降低,若接柱时加固了节点,反而会提高结构整体的延性。在接梁时应注重结构的整体性,做到两边新旧梁加固的统一。Being aimed at the post-anchoring joints of RC beams and columns widely applied in engineering practices of renovation and reinforcement of existing structures, the seismic performance of those post-anchored joints was researched experimentally.The specimens were designed according to the prototype structure with a scale of 1∶2.The multiple post-anchored joints in frame structure were considered comprehensively, including the post-cast column on the top of the intermediate frame, the post-cast beam and column on the top of the side frame, and the post-cast beam connected to the intermediate layer.At the same time, several post-anchoring methods were studied, such as reinforcement implanted directly, adding additional reinforcements, and strengthening the main reinforcements by welding steel strip hoop.During the whole experimental process, the laws of the cracks, failure pattern, ductility, energy dissipation capacity and stiffness degradation for different joints were researched carefully.The conclusions were got that the seismic performance of post-anchored joints could be remained by considering the design principle of strong column and weak beam, strong joint and weak member, and anchorage length.The ductility of the whole structure could be improved by strengthening connections.The integrity of the structure should be considered when the new-old beams were connected, so as to ensure the unified strengthening on both sides.

关 键 词：钢筋混凝土框架 后锚固梁柱 抗震性能 试验研究 植筋 焊接箍板 

分 类 号：TU352.11[建筑科学—结构工程] TU375.4