冻融环境作用下低矮RC剪力墙抗震性能试验研究

发布时间：2018-05-19 03:39

本文选题：拟静力试验 + 冻融循环　；参考：《湖南大学学报(自然科学版)》2017年09期

【摘要】：采用人工气候快速冻融试验方法,对4个实际剪跨比为1.14的低矮RC剪力墙试件进行冻融试验,进而对其进行低周反复加载试验,研究低矮RC剪力墙经不同冻融循环作用后其抗震性能的衰减规律.以承载力、延性系数、塑性转角、强度衰减、刚度退化和累积滞回耗能等指标为参数,探讨冻融循环次数对低矮RC剪力墙抗震性能的影响.结果表明:暗柱和墙体分布钢筋可以约束冻胀裂缝的开展,延缓冻融循环作用对墙体造成的破坏;冻融循环作用会引起低矮RC剪力墙的破坏模式由弯曲为主的弯剪破坏向剪切为主的弯剪破坏转变;冻融循环作用下低矮RC剪力墙抗震性能指标退化规律为:随着冻融循环次数的增加,水平抗剪承载力显著降低,位移延性系数和塑性转角显著增大,强度退化速率加快,耗能能力逐步变差.
[Abstract]:Four low RC shear wall specimens with an actual shear span ratio of 1.14 were tested by rapid freeze-thaw test in artificial climate, and then subjected to low-cycle repeated loading test. The attenuation law of seismic behavior of low RC shear wall subjected to different freeze-thaw cycles is studied. The influence of freeze-thaw cycles on the seismic behavior of low RC shear walls was investigated with the parameters of bearing capacity ductility coefficient plastic rotation angle strength attenuation stiffness degradation and cumulative hysteretic energy dissipation. The results show that the distribution of steel bars in dark columns and walls can restrain the development of frost heaving cracks and delay the damage caused by freeze-thaw cycles. The failure mode of low RC shear wall will be changed from flexural shear failure to shearing failure due to freeze-thaw cycle. Under the action of freeze-thaw cycle, the degradation law of seismic performance index of low RC shear wall is as follows: with the increase of freeze-thaw cycle times, the horizontal shear bearing capacity decreases significantly, the displacement ductility coefficient and plastic rotation angle increase significantly, and the strength degradation rate accelerates. The ability to consume energy is gradually getting worse.
【作者单位】：西安建筑科技大学土木工程学院;
【基金】：国家科技支撑计划资助项目(2013BAJ08B03) 教育部高等学校博士学科点专项科研基金资助项目(20136120110003) 陕西省科研项目资助项目(2012K12-03-01,2011KTCQ03-05,2013JC16) 西安建筑科技大学博士后基金资助项目~~
【分类号】：TU352.11;TU398.2

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