人工气候环境下锈蚀RC弯剪破坏框架梁抗震性能试验研究

发布时间：2018-04-16 15:10

本文选题：人工气候环境 + RC框架梁　；参考：《土木工程学报》2015年11期

【摘要】：采用人工气候加速腐蚀方法,对8个剪跨比为2.67的RC框架梁进行拟静力试验,研究不同锈胀裂缝宽度下,箍筋与纵筋锈蚀的弯剪破坏RC框架梁的抗震性能衰减规律。首先,保持框架梁设计参数不变,仅变化钢筋锈蚀程度,其次,保持锈蚀程度不变,仅改塑性铰区箍筋间距,以延性系数、承载力、塑性转角、变形恢复能力、刚度退化和累积滞回耗能等指标为参数,给出了不同锈蚀程度、不同配箍率下RC框架梁的抗震性能退化规律:锈蚀程度相同时,随配箍率的减小,锈蚀框架梁对筋锈蚀程度更加敏感;由于箍筋纵筋均锈蚀,构件抗弯、抗剪承载力均下降,表现为构件极限荷载的降低和屈服平台的变短;以延性系数、软化刚度退化和累积耗能等参数对锈蚀率最为敏感;随锈蚀率增大,破坏模型主要由弯曲破坏为主的弯剪破坏模式转变为延性差、剪切变形明显的脆性破坏模式。
[Abstract]:Eight RC frame beams with shear span ratio of 2.67 were subjected to pseudostatic tests by means of accelerated corrosion in artificial climate. The seismic attenuation of RC frame beams with stirrups and longitudinal bars corroded by bending and shear failure was studied under different corrosion crack widths.First of all, keep the design parameters of frame beam unchanged, only change the degree of steel corrosion, secondly, keep the degree of corrosion unchanged, only change the space of stirrups in plastic hinge region, take ductility coefficient, bearing capacity, plastic turning angle, deformation recovery ability, etc.Stiffness degradation and cumulative hysteretic energy dissipation are the parameters. The seismic degradation law of RC frame beams with different corrosion degree and different hoop ratio is given: when the corrosion degree is the same, with the decrease of hoop ratio,The corroded frame beam is more sensitive to the corrosion degree of the reinforcement, because of the corrosion of the stirrups, the flexural strength and the shear bearing capacity of the members are all decreased, which is shown by the reduction of the ultimate load of the members and the shortening of the yield platform, the ductility coefficient, the ductility coefficient, the ductility coefficient, the ductility coefficient,The degradation of softening stiffness and cumulative energy dissipation are most sensitive to the corrosion rate, and with the increase of corrosion rate, the failure model changes from bending failure mode to brittle failure mode, which is characterized by poor ductility and obvious shear deformation.
【作者单位】：西安建筑科技大学;
【基金】：国家科技支撑计划(2013BAJ08B03) 国家自然科学基金(50978218,51108376) 教育部高等学校博士学科点专项科研基金(20136120110003) 陕西省科研项目(2012K12-03-01,2011KTCQ03-05,2013JC16)
【分类号】：TU375.4;TU352.11

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