二次受力下碳纤维布加固梁抗弯性能试验研究  

An Experimental Study of The Flexural Behavior of Strengthening RC Beams Using CFRP Sheets Under Sustaining Load

作　　者：沈华[1] 马莉莉 

机构地区：[1]南通职业大学建筑工程系,江苏南通226007 [2]南通如东建筑工程学校,江苏如东226400

出　　处：《南通职业大学学报》2007年第1期84-87,共4页Journal of Nantong Vocational University

摘　　要：进行了4根不同二次受力条件下碳纤维布加固的钢筋混凝土梁和1根对比混凝土梁的抗弯性能试验研究。试验及分析结果表明,用粘贴碳纤维布的方法来提高梁的承载力十分有效,且预加载的存在使加固梁的极限荷载降低;碳纤维布能有效约束裂缝的开展,但裂缝的数量增加和分布区域变大,且预加载的大小会影响加固梁裂缝的开展和分布;碳纤维布加固可以增强梁的刚度,但延性有所降低。To investigate the effects of externally bonded carbon fiber reinforced polymer （CFRP） sheets on the flexural performance of the beams strengthened at different levels of sustaining load, tests of 4 retrofitted with CFRP sheets and 1 control beams are carried out. The experimental and analytical results show that the ultimate bearing capacity of concrete beams strengthened with CFRP sheets can be considerably improved, and the ultimate bearing capacity is lower because of the existing of the sustaining load; the CFRP sheets can restrict the development of cracks, but the numbers increase and the distribution expanded, the level of sustaining load can affect the development and distribution of the crack at the same time; the stiffness of beams retrofitted with CFRP sheets are greater than that of the control, but ductility is degraded.

关 键 词：钢筋混凝土梁 抗弯性能 二次受力 碳纤维布 加固 

分 类 号：TU375.1[建筑科学—结构工程]