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.
出处
《桂林工学院学报》
北大核心
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)
关键词
体外预应力
承载力增量
加固效应
external prestressing
increase in load-carrying capacity
reinforcement effect
