碳纤维布加固修复混凝土小型空心砌块开裂墙体的试验研究

Experimental study on strengthening and repairing cracked small-sized hollow concrete block walls with continuous carbon fiber sheets

对混凝土小型空心砌块墙体粘贴碳纤维布在低周反复荷载作用下的受力性能进行了试验研究。研究结果表明,粘贴碳纤维布能够提高开裂墙体的极限荷载,增强其变形能力,是改善混凝土小型空心砌块墙体结构性能,加固修复建筑物墙体裂缝的一项有效措施。研究还发现,碳纤维布在加固墙体中的作用可比拟为桁架模型中的拉杆。基于以上研究,本文提出了碳纤维布加固砌块墙体抗剪承载力的简化计算方法,可供设计人员在实际工程应用中参考。

In order to evaluate the effectiveness of repair and retrofit technique f or strengthening cracked small-siz ed hollow concrete block masonry walls using continuous carbon fiber sheet,three specimens were designed and t ested under combined uniformly distributed con stant vertical load and cyclic lateral load.The test results showed that the ultimate load of the cracked walls strengthen ed by carbon fiber sheets was increased remarkably and the deformation ab ility of the specimens was obviously improved.I t was also found that the action of carbon fiber sheet system in the strengthened walls was similar to that of the flexible diagonal braces in the truss model.Finally,a simplified calculatio n method for the design of strengthening the crac ked concrete block masonry walls was presented.