【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。更多还原

【Abstract】 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.更多还原