【摘要】 参照建于20世纪70年代末的具有代表性的8层RC框架结构,按照1∶2.5的比例进行缩尺,制作一个两榀两层三跨的RC框架子结构模型。采用外贴防屈曲支撑RC框架的方式分别加固子结构模型每榀的中间跨,两榀框架的加固方式分别为植筋加固和抗剪键加固。对加固后的模型进行拟静力抗震性能试验,试验研究的结果表明,两种加固方法均安全可靠;防屈曲支撑加固后RC框架结构的抗震性能明显提高,在规范允许的变形条件下,地震能量主要被防屈曲支撑耗散,试验结果表明防屈曲支撑在地震作用时耗散的地震能量占到结构总耗能的66.9%以上。另外,根据FEMA356中基于性能的抗震设计方法,采用Perform-3D软件对框架结构模型进行非线性分析,分析结果与试验结果吻合良好。更多还原

【Abstract】 A 1∶ 2.5 two-storey RC-frame-structure model is designed as a substructure of an existing eight-storey RC building built in late 1970s.It is respectively reinforced with two buckling-restrained-braces frames by means of embedded bars and shear connectors respectively on the middle span of the three-span RC model structure on both sides.Pseudo-static cyclic loading tests were carried out on the model frame substructure.The test results show that the two connecting methods of buckling-restrained braced frame perform well together with the existing frame structure under cyclic loading,and buckling-restrained braces increase the seismic performance of model structure and seismic energy to the structures during earthquake is mainly absorbed by buckling-restrained braces,leading to less damage to structure elements.The test result shows that more than 66.9% seismic energy is absorbed by buckling-restrained braces.Nonlinear analysis of the frame structure is conducted by the program Perform-3D and the computation results agree well with the tested ones.更多还原