低配筋剪力墙单边抗震加固试验研究
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摘要
北京前三门地区有一大批始建于上个世纪70年代的混凝土建筑,主要结构形式为鱼骨式剪力墙。由于修建时间早,其混凝土强度和配筋率远低于现行混凝土结构抗震规范要求,需进行加固处理。加固方案采用外套式加固,该方案具有不入户,且容易和节能保温及屋面改造相结合的优点。为了检验该方案的加固性能,针对其剪力墙结构的受力特点,制作了4个未加固墙体和4个单边加固墙体,改变了墙宽与轴压比等参数。对8个墙体进行拟静力加载,得到了墙体在加固前后的承载力、延性等数据。试验结果表明,加固后墙体承载力明显提高,但墙体延性并没有显著改善。该加固方案对于老旧低配筋剪力墙有良好的效果。
A group of reinforced concrete buildings which were constructed during 1970s are still used in Qiansanmen zone of Beijing.The structure form of these buildings is fishbone shear wall.As the buildings were built at an early stage,the concrete strength and the reinforcement ratio are very low,which no longer satisfy current seismic design code.Therefore,strengthening is needed.The strengthening method applied in this study is to complete all the constructed from outside without touching upon the inside of the buildings.To measure the effectiveness of the strengthening method,eight wall specimens,e.g.four unreinforced and four strengthened,are constructed and tested.Quasi-static tests are used and different axial force ratios are considered in the tests.Stiffness,strength,and deformation capacity of the specimen are obtained from the tests,and comparison is conducted between strengthened and unreinforced specimens.The test results show that strengthening from single side can increases the strength of the wall,but can't increase the deformation capacity.
A group of reinforced concrete buildings which were constructed during 1970s are still used in Qiansanmen zone of Beijing.The structure form of these buildings is fishbone shear wall.As the buildings were built at an early stage,the concrete strength and the reinforcement ratio are very low,which no longer satisfy current seismic design code.Therefore,strengthening is needed.The strengthening method applied in this study is to complete all the constructed from outside without touching upon the inside of the buildings.To measure the effectiveness of the strengthening method,eight wall specimens,e.g.four unreinforced and four strengthened,are constructed and tested.Quasi-static tests are used and different axial force ratios are considered in the tests.Stiffness,strength,and deformation capacity of the specimen are obtained from the tests,and comparison is conducted between strengthened and unreinforced specimens.The test results show that strengthening from single side can increases the strength of the wall,but can't increase the deformation capacity.
引文
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[2]孙立富,高小旺.鱼骨式剪力墙结构抗震性能评估[J].工程抗震与加固改造,2009,(5):118～123Sun Li-fu,Gao Xiao-wang.Seismic PerformanceEvaluation of the Fish-bone Wall Structure[J].Earthquake Resistant Engineering and Retrofitting,2009,(5):188～123(in Chinese)
[3]郝锐坤,徐培福,黄宝清.底层大空间上层鱼骨式剪力墙结构十二层模型纵向拟动力试验研究[J].建筑科学,1986,(4):9～15Hao Rui-kun,Xu Pei-fu,Huang Bao-qing,Longitudinal Direction Pseudo Dynamic Test Researchon a 12-Story Fishbone Type Shear Wall Structure Modelwith Large Space Ground Floor[J].Building Science,1986,(4)(in Chinese)
[4]张培信.高层住宅剪力墙结构抗震加固试验研究[J].工业建筑,1994,(4):24`27Zhang Pei-xin,Experimental Studies of AseismaticStrengthening on Shear-wall of High-rise House Structure[J].Industral Construction,1994,(4):24～27(inChinese)
[5]钱稼茹,吕文,方鄂华.基于位移延性的剪力墙抗震设计[J].建筑结构学报,1999,(3):42～48Qian Jia-ru,Lv Wen,Fang E-hua.DisplacementDuctility-Based A Seismic Design for Shear Walls[J].Journal of Building Structures,1999,(3):42～48(inChinese)
[6]李湛.钢筋混凝土结构改造加固设计的特点和应用[J].有色金属设计,2010,(2):36～39Li Zhan.Features of Transformation and StrengtheningDesign for Reinforced Concrete Structure and ItsApplication[J].Nonferrous Metals Design,2010,(2):36～39(in Chinese)
[7]过镇海.钢筋混凝土原理[M].北京:清华大学出版社,1998Guo Zhen-hai.Principles of Reinforced Concrete[M].Beijing:Tsinghua University Press,1998(in Chinese)
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