两种农村砖木结构模型振动台试验比较分析
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摘要
北京地区农村住宅的砖木结构具有两种典型的结构类型,分别是木柱支撑加木屋架和砖柱支撑加木屋架形式。为了了解这两种典型砖木结构农村住宅结构的抗震能力,根据调研结果,设计了两个典型砖木结构单层三开间农村住宅2/3缩尺的振动台试验模型。并按照北京地区8度抗震设防的要求,分别完成了模型在设计小震(0.072g)、中震(0.2g)和大震(0.4g)条件下的振动台动力试验,量测了模型的动力响应,记录了不同激励水平下模型的开裂情况。通过比较分析两个振动台试验结果,发现此两类结构类型的前纵墙由于门窗开洞,其抗侧刚度与后纵墙明显不同,导致前纵墙的纵向地震反应远远大于后纵墙,且两侧山墙出现明显的平面外弯曲破坏。结果表明,木柱支撑结构的抗震能力优于砖柱支撑结构的抗震能力。
There are two kinds of typical brick- timber structures of rural area in Beijing,including timber column bracing and brick column bracing unde the roof woodwork respectively. In order to know the seismic resistant capacity of the two typical rural brick- timber structures,two 2 /3 scaled typical brick- timber structure models were designed and tested respectively on a shaking table,which is a single story brick- timber structure with three bays.According to National Seismic Design Code GB50011,seismic fortification intensity is 8 for most Beijing rural areas. Different dynamic base excitation levels,such as design small earthquake with PGA = 0. 072 g,middle earthquake with PGA = 0. 2g and great earthquake with PGA = 0. 4g respectively,were input to the models. Dynamic responses and cracking characteristics of the brick walls were recorded. Based on the test results,the seismic resistant capacity of the modes were obtained and analyzed. It was found that due to the door or window openings in the front wall,there is an obvious difference of lateral resisting stiffness between the front wall and the back wall,the response of the front wall along longitudinal direction is far greater than that of the back wall. This leads to out plan flexural failure of the both side gable walls. The test results shows that the seismic resistant capacity of structure with timber column bracing is better than that of structure with brick column bracing.
There are two kinds of typical brick- timber structures of rural area in Beijing,including timber column bracing and brick column bracing unde the roof woodwork respectively. In order to know the seismic resistant capacity of the two typical rural brick- timber structures,two 2 /3 scaled typical brick- timber structure models were designed and tested respectively on a shaking table,which is a single story brick- timber structure with three bays.According to National Seismic Design Code GB50011,seismic fortification intensity is 8 for most Beijing rural areas. Different dynamic base excitation levels,such as design small earthquake with PGA = 0. 072 g,middle earthquake with PGA = 0. 2g and great earthquake with PGA = 0. 4g respectively,were input to the models. Dynamic responses and cracking characteristics of the brick walls were recorded. Based on the test results,the seismic resistant capacity of the modes were obtained and analyzed. It was found that due to the door or window openings in the front wall,there is an obvious difference of lateral resisting stiffness between the front wall and the back wall,the response of the front wall along longitudinal direction is far greater than that of the back wall. This leads to out plan flexural failure of the both side gable walls. The test results shows that the seismic resistant capacity of structure with timber column bracing is better than that of structure with brick column bracing.
引文
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[4]韩家军张超吴从晓周云,云南普洱6.4级地震房屋震害分析,工程抗震与加固改造.2008(4).104-109Han Jiajun,Zhang Chao,etc.,Building Damage Analysis of Pu’er Ms 6.4 Earthquake in Yunnan Province,Earthquake Resistant Engineering and Retrofitting,2008(4).104-109
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