无构造柱退层式砌体民居抗震加固试验研究

Shaking table test on strengthened self-built dwelling without structural column

针对无构造柱退层式砖砌体自建民居的破坏形式,设计了综合加固方案,即第一层退层处采用预应力钢筋、顶层粘贴碳纤维布进行了民居加固。通过对加固后民居1/4模型的模拟地震动振动台试验表明:(1)民居加固后能够承受加速度峰值为0.5g的地震作用,抗震性能较加固前有明显提升;(2)民居加固后的破坏形式为墙体开裂破坏、窗间墙破坏、墙角局部破坏等;第二层纵墙退层处开裂破坏严重,为整个结构的薄弱部位。此研究成果,可用于村镇同类结构形式民居加固方案研究与设计。

Based on structural failure pattern obtained from shaking table tests, a comprehensive strengthening layout for a typical selLbuilding dwelling, the brick masonry building without structural columnwas designed. In this model, the first floor was strengthened by adopting prestressed steel and the top floor was pasted by carbon fiber sheet. The dynamic performance of the strengthened typical dwelling （1/4 model） was studied by shaking table test. The results show that （1） the strengthened dwelling is capable of withstanding earthquake action with acceleration peak of 0.5 g. The seismic performance of the dwelling is improved significantly compared to the original model. （2） The structural failure patterns of the strengthened dwelling includ wall cracking, destruction of the wall between the windows and localized corner damage. In addition, the wall of the second floor was severely damaged and is regarded as the weak point of the structure. In conclusion, the strengthening method suggested in this paper could apply to strengthening or retrofitting of the dwellings whose structural types are similar.