中文摘要：

老建筑中的小跨高比连梁的抗震能力往往不能满足当前的设计要求,容易发生脆性剪切破坏而最终可能导致整个剪力墙体系的倒塌。提出一种新型螺栓钢板加固法以提高既有连梁的抗震性能。按照1∶2比例制作了6个钢筋混凝土连梁试件进行低周反复荷载试验,结果表明,未进行加固的连梁呈现出脆性剪切破坏;直接采用螺栓钢板加固的连梁,虽然强度有所提高,但延性并没有提高,在同等条件下增加钢板屈曲控制装置后,加固后的连梁的刚度不会增加,而延性和变形能力可以提高很多。对于既有钢筋混凝土连梁构件,这种新型螺栓钢板加固法是一种非常有效的抗震加固方法,既可以提高其承载力,又可以提高其延性和耗能能力。

英文摘要：

The existing designs for deep reinforced concrete coupling beams with low shear span ratios in old buildings tend to fail in a brittle way under the earthquake,which may lead to the collapse of the shear wall. A new strengthening method with bolted steel plates for existing deep RC coupling beams was proposed. Six RC coupling beams were made with the ratio of 1∶ 2 and tested by cyclic loading. The results show that the RC coupling beam without being strengthened failed in a brittle way. The strength of the coupling beam only strengthened by bolted steel plate was improved,but the ductility did not rise. But after using buckling controlled device on the coupling beam strengthened by bolted steel plate,the ductility and deformation of the beam rised a lot while the stiffness did not increase. So this new strengthening method with bolted steel plate and buckling controlled device is effective for existing RC coupling beams,and the strength,ductility and ability of energy dissipation can all be improved.