砖填充墙加固前后钢筋混凝土框架的刚度与承载力

STIFFNESS AND LOAD CARRYING CAPACITY OF REINFORCED CONCRETE FRAMES WITH INFILLED WALL OR STRENGTHENED INFILLED WALL

通过低周反复加载试验与分析,研究了填充墙框架与填充墙加固后框架的初始刚度、刚度衰减规律和承载力计算方法。试验与分析结果表明,填充墙能大幅度提高框架的初始刚度,双面和单面夹板墙加固填充墙能使填充墙框架的初始刚度分别约提高1倍和0.5倍,而碳纤维布加固填充墙基本上不能提高框架的初始刚度。填充墙加固后框架的填充墙刚度衰减速度比未加固的填充墙框架有所减小。建议的填充墙框架与填充墙加固后框架的承载力计算公式与试验结果吻合良好。

Through cyclic loading tests and analysis,the calculating methods of the initial stiffness,attenuation law of stiffness and load carrying capacity for infilled frames or strengthened infilled frames are researched.Tests and analysis show that,the initial stiffness of frames is distinctly increased by the infilled walls,and it will be increased by one times and a half times respectively if the infilled walls are strengthened by double-faced and single-faced steel-meshed cement mortar,but it will barely be increased if the infilled walls are strengthened by carbon fiber sheet.The attenuation speed of infilled wall stiffness of strengthened infilled frames is lower than the non-strengthened one.The suggested calculating formulas for load carrying capacity of infilled frames and strengthened infilled frames are in good agreement with the test results.