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北京市有一批建于20世纪70年代的高层低配筋混凝土剪力墙住宅。由于修建时间较早,受到当时经济条件和规范水平的影响,结构混凝土强度低且配筋率严重不足,为了满足现行抗震规范对混凝土结构抗震的要求,需要进行抗震加固。为了尽可能缩短加固工程周期并减少对居民生活的影响,提出了外套式加固方法,该方法无需进入原结构内部,仅在原结构两侧延长横墙长度、增设纵墙,并在原结构顶部增设跨越屋面的大梁将两侧的加固部分连成整体。为了考察加固后结构的抗震性能,采用子结构技术进行1∶2缩比模型拟静力试验。试验结果表明:原结构经加固后承载力大幅提高;加固结构在层间位移角达到1/200时,承载力达到峰值;层间位移角达到1/100时,结构连梁剪坏,剪力墙墙角混凝土压碎,结构剩余承载力约为峰值承载力的85%;加固后结构承载力和延性满足现行抗震规范要求。
Beijing has a number of high-rise low-reinforced concrete wall houses built in the 1970s. Due to the earlier construction time, affected by the economic conditions and normative level at that time, the strength of structural concrete is low and the ratio of reinforcement is not enough. In order to meet the requirements of the existing seismic code for seismic resistance of concrete structures, seismic strengthening is required. In order to shorten the reinforcement engineering cycle as much as possible and reduce the impact on residential life, a sheathing reinforcement method is proposed. This method does not need to enter the original structure, and extends the length of the transverse wall only on both sides of the original structure, adds vertical walls, and crosses over the top of the original structure Roof beams will be reinforced on both sides of the whole unit. In order to investigate the seismic behavior of the strengthened structure, the sub-structure technique was used to simulate the 1: 2 model quasi-static test. The test results show that the bearing capacity of the structure increases greatly after the reinforcement of the original structure; the bearing capacity of the reinforced structure reaches a peak when the displacement angle between layers reaches 1/200; when the displacement angle of the layer reaches 1/100, Wall concrete corner crushing, the structure of the remaining bearing capacity of about 85% of the peak bearing capacity; structure bearing capacity and ductility to meet the current seismic code requirements.