基于破坏机制控制的砌体结构教学楼抗震加固设计研究  

Study on seismic strengthening design of masonry school building based on failure mechanism control

作　　者：吴昊[1] 赵世春[1] 许浒[1] 吴刚[2] 

机构地区：[1]西南交通大学,四川成都610031 [2]东南大学混凝土及预应力混凝土结构教育部重点实验室,江苏南京210096

出　　处：《土木工程学报》2014年第3期12-18,58,共8页China Civil Engineering Journal

基　　金：国家科技支撑计划(2009BAJ28B01);国家教育部东南大学博士生国内访学基金(BSFX2009-01)

摘　　要：为改善既有砌体结构教学楼的抗特大地震倒塌能力,提出一种以地震破坏机制控制为目的的结构抗震加固设计思路,采用钢筋网水泥砂浆面层对结构的纵向窗间墙进行三面抗震加固,同时在墙体两端采用竖向钢筋对钢筋网进行可靠锚固,按照1/2的比例设计2个两层缩尺砖砌体子结构试验模型,通过拟静力试验分别对普通窗间墙模型和窗间墙加固模型的宏观破坏机制、承载能力、延性和耗能能力等进行试验研究。结果表明:普通窗间墙模型发生薄弱层机制,模型最终形成倒塌机制;窗间墙三面抗震加固并锚固条件下,模型发生整体型破坏,并最终形成"强柱弱梁"式延性破坏机制,窗间墙形成"摇摆"机制,模型的墙体破坏形态、承载能力、延性和耗能能力等比普通窗间墙模型均得到显著改善,验证了该加固设计方案对于控制结构破坏机制和改善结构抗震性能的有效性。A seismic strengthening method aimed at controlling the earthquake damage mechanism of structure is presented to improve the collapse resistance of existing masonry school buildings under rare earthquake. Quasi-static tests on two half-scale two-story sub-structure brick masonry building models were conducted. Three sides of wall piers between window openings of one model are partially strengthened with steel mesh mortar splint where the steel mesh is adequately anchored with vertical reinforcements. The global failure mechanism, load bearing capacity, ductility and energy dissipation capacity of the two models are investigated experimentally. The results indicate that the masonry without strengthening exhibits soft-story collapse mechanism due to shear failure of piers, and strong pier-weak spandrel failure mechanism is manifested due to the formation of global failure. Rocking mechanism is developed in piers. The failure characteristic of piers, load bearing capacity. global ductility and energy dissipation capacity of masonry structure are significantly improved, indicating that the proposed strengthening method is effective in controlling failure mechanism and improving seismic performance of structure.

关 键 词：砖砌体结构 延性破坏机制 钢筋网砂浆面层加固窗间墙 锚固措施 拟静力试验 

分 类 号：TU362[建筑科学—结构工程]