弧形耗能器增强木构架抗震性能试验研究
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摘要
对5个1:1.67的缩尺木构架模型进行了低周反复荷载预损试验,随后对采用不同半径、不同厚度的弧形耗能器增强的预损木构架模型进行低周反复荷载试验,得到了增强前后木构架的破坏模式、荷载-位移滞回曲线、骨架曲线、耗能能力等性能参数;对弧形耗能器单独进行了低周反复荷载作用下的性能试验,得到了其滞回曲线和骨架曲线。试验结果表明:增强后木构架仍具有很好的变形能力;采用弧形耗能器能显著提高木构架的刚度、承载力和耗能能力,增强后木构架的承载力与刚度主要由弧形耗能器提供;木构架的刚度、承载力和耗能能力在一定范围内随着耗能器厚度的增加而增加;随着耗能器半径的增大,加载前期木构架刚度和承载力会有所下降,但加载后期耗能能力会有较大的提升。
Low-cycle reversed loading tests were conducted on five 1:1:67 scaled specimens without reinforcement,which were strengthened by curved steel dampers with different radius and thickness.The structure behaviors,such as the failure characteristics,P-△ hysteretic loops,skeleton curves and energy dissipation capacity were analyzed.The low-cycle reversed loading tests were conducted only on the curved steel dampers to obtain the hysteretic loops as well as skeleton curves.The test results indicate that strengthened frames also obtain good deformation capacity.Dampers can enhance strength and stiffness,develop energy disipation of the frames.Strength and stiffness of strengthened frames are mostly provided by curved steel dampers.Their capacity will increase with the bigger thickness within a certain range.With the increase of radius,the strength and stiffness is weakened in the early loading stage,while the energy dissipation capacity will increase more in the later loading stage.
Low-cycle reversed loading tests were conducted on five 1:1:67 scaled specimens without reinforcement,which were strengthened by curved steel dampers with different radius and thickness.The structure behaviors,such as the failure characteristics,P-△ hysteretic loops,skeleton curves and energy dissipation capacity were analyzed.The low-cycle reversed loading tests were conducted only on the curved steel dampers to obtain the hysteretic loops as well as skeleton curves.The test results indicate that strengthened frames also obtain good deformation capacity.Dampers can enhance strength and stiffness,develop energy disipation of the frames.Strength and stiffness of strengthened frames are mostly provided by curved steel dampers.Their capacity will increase with the bigger thickness within a certain range.With the increase of radius,the strength and stiffness is weakened in the early loading stage,while the energy dissipation capacity will increase more in the later loading stage.
引文
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[7]陆伟东,邓大利.木结构榫卯节点抗震性能及其加固试验研究[J].地震工程与工程振动,2012,32(3):109-116.(LU Weidong,DENG Dali.Experimental research on seismic performance of wooden mortisetenon joints before and after reinforcement[J].Journal of Earthquake Engineering and Engineering Vibration,2012,32(3):109-116.(in Chinese))
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