【摘要】 对宋代殿堂式木构建筑心间缩尺模型已残损的燕尾榫节点用碳纤维(CFRP)布进行加固,并进行模拟地震振动台试验。选用El Centro波、Taft波、兰州波作为输入地震波,采用多点多指标同步测量柱根、柱头、斗栱的地震响应,对CFRP加固模型结构的破坏形态、动力特性、耗能能力进行分析。结果表明:CFRP加固模型的自振周期T的变化范围在0.53～0.67 s之间,阻尼比ξ的变化范围在2.8%～4.6%之间,随着地震激励的增加而增大;加固模型的动力放大系数β小于1,随着地震激励的增加而减小;模型的铺作层、柱础层通过摩擦滑移来耗能,柱架层的耗能能力最强,在模型整体的耗能、减震中起着主要作用。更多还原

【Abstract】 An ancient palace timber structure model was made according to the requirements of fabrication methods of Song Dynasty(960-1270 A.D.).All damaged swallow-tailed mortise-tenon joints of frame were strengthened with carbon fiber reinforced polymer(CFRP) sheets.The shaking table test was carried out.The sensors were placed to measure the real-time responses of the model and the data of the shaking table itself under three earthquake waves: El Centro,Taft and Lanzhou waves.The failure mode,dynamic behavior and hysteretic energy dissipation performance were analyzed.The following conclusions are drawn: The natural period and damping ratio of the model increase along with the increasing of the input seismic energy.The range of natural periods T is 0.53-0.67 s and the damping ratio ξ is 2.8%-4.6%.The dynamic magnification factor β decreases with the increasing of the vibration excitation.Bucket arch layer and column base dissipate seismic energy by means of frictional slippage.The joints strengthened with CFRP sheets have the strongest energy dissipation capacity and play a major role in the shock absorption.更多还原