预应力碳纤维板加固混凝土梁多次张拉时预应力损失分析  

Prestressing Loss Analysis of Reinforced Concrete Beams Strengthened Repeatedly with Prestressed CFRP Sheets

作　　者：邹经 杨勇新[1] 陈伟 薛政 李彪[1] 

机构地区：[1]中冶建筑研究总院有限公司,北京100088 [2]武汉三源特种建材有限责任公司,湖北武汉430083 [3]西南科技大学土木工程与建筑学院,四川绵阳621010

出　　处：《施工技术》2018年第4期128-131,共4页Construction Technology

基　　金：国家973计划资助项目(2012CB026205)

摘　　要：在多条预应力碳纤维板分次张拉加固混凝土梁的过程中,碳纤维板之间相互作用造成的预应力损失不容忽视。通过不同维度的应力分析,得到预应力碳纤维板加固混凝土梁多次张拉时产生的预应力损失计算公式,并对比分析了各维度计算公式的区别和适用范围。基于张拉预应力损失计算公式提出了碳纤维板预应力加固中的超张拉设计方案,并对其适用条件进行了分析。The prestressing loss caused by the mutual influence of the CFRP sheets in the process of the repeated strengthening for concrete beams can＇t be ignored. In this paper,the prestressing loss of CFRP sheets in the strengthening process has been obtained through the analysis of stress in different dimensions. The differences and range of application of each dimension are compared and analyzed.Based on the calculation formula of prestressing loss,this paper puts forward a design scheme of the over tensioning in the prestressed reinforcement process for CFRP sheets. The applicable conditions are also analyzed.

关 键 词：碳纤维板 预应力 加固 预应力损失 计算方法 适用条件 

分 类 号：TU746.3[建筑科学—建筑技术科学]