预应力碳纤维板加固混凝土梁的二次受力性能分析  

Analysis of Secondary Mechanical Properties of Concrete Beams Strengthened with Prestressed CFRP

作　　者：李明霞 张瑞友[2] Li Ming-xia;Zhang Rui-you

机构地区：[1]桂林理工大学土木与建筑工程学院,广西桂林541004 [2]广西职业技术学院艺术传媒与建筑工程学院,南宁530226

出　　处：《建筑技术开发》2020年第5期3-4,共2页Building Technology Development

基　　金：桂林市科学技术研究开发项目(20170215)。

摘　　要：以3根长度均为4.2 m的钢筋混凝土梁试件为例,进行预应力碳纤维板二次受力加固试验,分析已屈服钢筋试件、使用预应力碳纤维板加固后试件的力学性能。将未经过预应力碳纤维板加固构件的一次受力,与预应力碳纤维板加固后的构件二次受力进行比较,分析该技术在提高钢筋混凝土构件性能的抗弯刚度、延性、构件强度等方面优势。可得到经过碳纤维板加固后的试件,自身开裂荷载明显提高,与未加固的试件对比,屈服荷载与极限荷载的提高效果显著;试件截面的刚度被大幅减弱,但试件变形程度依然与比对试件相似。说明对结构已剧烈超载的钢筋混凝土梁进行预应力碳纤维板加固,能够令材料抗弯刚度性能恢复至超载之前水平。Three reinforced concrete beam specimens with a length of 4.2 metres are designed to carry out the secondary stress strengthening test of prestressed carbon fiber board,and the mechanical properties of the specimens after yielding reinforcement and strengthening with prestressed carbon fiber board are analyzed. The primary stress of the component without prestressed CFRP reinforcement is compared with the secondary stress of the component after prestressed CFRP reinforcement,and the advantages of this technology in improving the flexural rigidity,ductility and strength of reinforced concrete components are analyzed. Compared with the unreinforced specimens,the yield load and ultimate load of the specimens increased significantly;the stiffness of the cross-section of the specimens was greatly weakened,but the deformation degree of the specimens was still similar to the comparison specimens. The results show that the ?exural rigidity of the reinforced concrete beams with severe overloading can be restored to the level before overloading.

关 键 词：预应力 碳纤维加固 钢筋混凝土梁 二次受力 

分 类 号：TU391[建筑科学—结构工程]