作　　者： ; ;

机构地区： 华南理工大学土木与交通学院

出　　处： 《华南理工大学学报（自然科学版）》 2007年第7期10-14,共5页

摘　　要： 在碳纤维增强复合材料(CFRP)板加固钢梁中,CFRP板端部的应力集中往往会导致板的剥离破坏.文中首先对CFRP板加固钢梁的界面应力进行了研究,推导了外荷载作用下CFRP板加固钢梁的界面应力计算公式;然后,通过改变CFRP板的长度、厚度以及加载方式,探讨了静载作用下8个试件的承载力及刚度变化.理论分析及试验结果表明:(1)试件的主要破坏模式是CFRP板的剥离破坏;(2)增加板长能减小加固梁的界面应力集中,但不能提高梁的截面承载力和刚度;增加板厚虽然增加了界面应力集中,却能进一步提高梁的截面承载力和刚度;(3)由界面应力的理论计算公式求出的各个试件发生剥离破坏时的最大界面应力基本一致. In order to overcome the carbon fiber-reinforced polymer （CFRP） plate debonding from the CFRP- strengthened steel beam due to the stress concentrations at the two ends of the plate, the interracial stresses in the strengthened beam under mechanical loads were formulated, and the bearing capabilities and stiffness of 8 specimens with different plate lengths, thickness and loading cases under static loads were tested. Theoretical and experimental results show that debonding is the main failure mode of the strengthened beam, that the increase of plate length does not affect the bearing capacity and stiffness of the strengthened beam but decrease the stress concentration, that the increase of plate thickness not only improves the bearing capability and stiffness but also increases the stress concentration, and that all the theoretical maximum interracial stresses of the specimens under the debonding loads are very close.

关 键 词： 碳纤维增强复合材料 钢梁 加固 静载试验 应力分析

领　　域： [建筑科学] [建筑科学] [交通运输工程]