新型螺栓钢板加固法提高既有钢筋混凝土连梁抗震性能的试验研究*
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（1 北京建筑大学土木与交通工程学院, 北京 100044；2 中国建筑标准设计研究院有限公司，北京 100082）［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。［关键词］加固; 连梁; 抗震性能; 钢板; 钢板屈曲控制装置中图分类号：TU317.2 文献标识码：A 文章编号：1002-848X(2014)21-0086-05Experimental study on the seismic performance of existing reinforced concrete coupling beams strengthened by new bolted steel plateCheng Bei1, Li Shiwei1, Shi Cong1, Song Wenjing2(1 School of Civil and Transportation Engineering, Beijing University of Civil Engineering and Architecture, Beijing 100044, China; 2 China Institute of Building Standard Design and Research, Beijing 100082, China)Abstract: 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.Keywords: strengthening; coupling beam; seismic performance; steel plate; buckling controlled device with steel plate*国家自然科学青年基金（51208023）。作者简介：程蓓，博士，讲师，一级注册结构工程师，Email：chengbei@bucea.edu.cn。参考文献［1］PAULAY T. Coupling beams of reinforced concrete shear walls［J］. Journal of the Structural Division, 1971, 97(ST3): 843-862.［2］BERG V B , STRATTA J L. Anchorage and the Alaska earthquake of March 27［M］. New York: American Iron and Steel Institute, 1964.［3］MITCHELL D, DEVALL R H, SAATCIOGLU M, et al. Damage to concrete structures due to the 1994 Northridge earthquake［J］. Canadian Journal of Civil Engineering, 1995, 22(2): 361-377.［4］WANG Y Y. Lessons learned from the “5-12” Wenchuan Earthquake: evaluation of earthquake performance objectives and the importance of seismic conceptual design principles［J］. Earthquake Engineering and Engineering Vibration, 2008, 7(3):255-262.［5］HARRIES K A, COOK W D, MITCHELL D. Seismic retrofit of reinforced coupling beams using steel plates［C］//ACI SP-160. 1996: 93-114.［6］SU R K L, ZHU Y. Experimental and numerical studies of external steel plate strengthened reinforced concrete coupling beam［J］. Engineering Structures, 2005, 27(10): 1537-1550.
