CFRP加固RC梁-板-柱框架中节点抗震性能试验研究

发布时间：2018-06-28 07:34

本文选题：钢筋混凝土框架 + 中节点　；参考：《建筑结构学报》2016年05期

【摘要】：试验中设计了考虑楼板和正交梁的足尺钢筋混凝土框架中节点,对其进行拟静力试验,研究柱端、梁端采用CFRP加固对梁-板-柱中节点抗震性能和破坏模式的影响。分析了节点的破坏模式、滞回曲线、骨架曲线、耗能、位移延性、刚度退化及节点核心区剪切变形等。结果表明:由于楼板和正交梁的影响,未加固节点呈现"强梁弱柱"的柱铰失效模式;采用CFRP仅加固柱端或同时加固柱端及梁端,对节点承载力影响较小,但可有效提高节点的位移延性和耗能能力,使中节点的破坏模式由柱铰机制转为"强柱弱梁"的梁铰机制,仅采用CFRP加固柱端的方法效果更好;由于正交梁的存在,节点核心区在较大位移水平下未出现明显的剪切破坏。
[Abstract]:In the experiment, the joints of full-scale reinforced concrete frame considering floor slab and orthogonal beam are designed, and the quasi-static test is carried out to study the effect of CFRP reinforcement at the end of column and beam end on the seismic behavior and failure mode of beam-slab-column joints. The failure mode, hysteretic curve, skeleton curve, energy dissipation, displacement ductility, stiffness degradation and shear deformation in the core of the joint are analyzed. The results show that due to the influence of floor slab and orthogonal beam, the failure mode of "strong beam and weak column" appears in the unstrengthened joints, and CFRP is used to reinforce only the column end or the column end and beam end simultaneously, which has little effect on the bearing capacity of the joint. However, the displacement ductility and energy dissipation ability of the joints can be improved effectively, and the failure mode of the middle joints can be changed from the column hinge mechanism to the beam hinge mechanism of "strong column and weak beam", and the method of strengthening column ends only with CFRP is more effective, because of the existence of orthogonal beams, There is no obvious shear failure in the core region of the node at large displacement level.
【作者单位】：结构工程灾变与控制教育部重点实验室(哈尔滨工业大学);哈尔滨工业大学土木工程学院;中国煤炭科工集团沈阳设计研究院有限公司;
【基金】：国家自然科学基金项目(51278150,51478143) 中国博士后科学基金第八批特别资助项目(2015T80354)
【分类号】：TU398.9;TU352.11

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