体外预应力加固混凝土梁承载力增量分析  

Carrying Capacity Increment Analysis of Concrete Beams Strengthened with External Prestressing

作　　者：金凌志[1] 周晓杰[1] 

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

出　　处：《桂林工学院学报》2010年第1期62-65,共4页Journal of Guilin University of Technology

基　　金：广西科学基金资助项目(桂科自0447095);广西建筑工程检测与试验重点实验室基金资助项目(桂科能07109005-16);广西区教育厅资助项目(桂教科研[2004]20)

摘　　要：为了确定由于体外预应力的存在而引起混凝土梁承载力的增量,需要采用比以往允许截面分析法更加直接的计算方法。运用体外预应力加固简支梁的直接设计方法,结合工程实例,对其体外预应力筋提供的承载力增量进行计算并分析。结果表明:由于体外预应力筋的存在,混凝土加固梁的承载力增量在70%以上,加固效果明显,计算公式表达直观,设计概念清晰,计算过程简单方便,计算结果可信实用。直接计算方法不但对简支梁适用,对比较普遍的多跨框架梁,而按单跨进行体外索布索加固的情形也是可行的。In order to calculate the carrying capacity increment of concrete beams strengthened with external prestressing,a new approach more convenient than＂allowing-section＂ approach is adopted.The carrying capacity increment which is caused by the external prestressing reinforcement is calculated and analyzed by direct design approach for strengthening simple-span beams with external post-tensioning and engineering example.The result shows that the carrying capacity is increased to 70% by the external pre-stressing reinforcement.The strengthening effect is obvious.This calculation in practical engineering is more convenient than other methods.The direct design approach is applied not only in the simple-span beams with external post-tensioning,but also in the multi-span frame beams.

关 键 词：体外预应力 承载力增量 加固效应 

分 类 号：TU378.1[建筑科学—结构工程]