体外预应力加固混凝土框架梁体外筋应力增量分析  

Analysis of stress increment of reinforcing frame beams by outside prestressed technology

作　　者：满媛[1] 崔燕伟[1] 

机构地区：[1]平顶山工学院土木工程系,河南平顶山467000

出　　处：《混凝土》2008年第8期50-53,共4页Concrete

摘　　要：体外预应力是后张预应力体系的一个重要分支,已越来越广泛地应用于桥梁工程和建筑结构以及结构加固。应力增量和二次效应是体外预应力结构设计中两个关键因素,同时也是两个难点问题。国内外对体外预应力的研究大都集中在简支梁,而对超静定梁的研究很少,因此有必要对体外预应力超静定梁进行深入的研究。通过试验重点分析了框架梁体外筋应力增量随荷载增长的规律以及应力增量与梁跨中挠度的关系,并通过综合分析国内外研究资料及试验结果,总结出了一些有益的关于体外预应力加固框架梁应力增量的试验结论,并提出了计算超静定结构应力增量的简要计算公式,这对我们今后进行体外预应力超静定结构设计和加固都能够提供一定的帮助,在港口、水坝、桥梁等结构的建设上也都有广泛的应用前景。Extemal prestressing is an important branch of post-tensioning system, which has widely adopted in bridge engineering and building structure as well as structure strengthening.Stress increment and second-order effect are the two critical factors in design of concrete beams with external prestressing.The study on concrete beams with external prestressing,domesticaly and overseas, mainly deal with simple-supported beams and rarely deal with statically indeterminate beams.So it is necessary to do an in-depth study on statically indeterminate concrete beam with external prestressing.The up-to-date state of stress increment of external tendon was given firstly and an relationship between the tendon stress increments and deflection of the concrete beams was found, by the analysis of experiments＇ data and the test result, drew some beneficial trial conclusions on stress increment of reinforcing frame beams by outside prestressed technology.The simplified calculate formula using in caculating statically indeterminate structure is proposed, it will provide a certain help about design and reinforce with statically indeterminate structures, also have extensive applied foreground in structural construction at port, dam, bridge etc.

关 键 词：体外预应力 超静定梁 应力增量 挠度 试验研究 加固 简化计算公式 

分 类 号：TU528.01[建筑科学—建筑技术科学]