无粘结预应力筋极限应力增量计算方法的对比研究  

Comparative study on the calculation method of ultimate stress increment of unbonded prestressed tendons

作　　者：赵少伟 陈冰 郭蓉 刘真琛 ZHAO Shaowei;CHEN Bing;GUO Rong;LIU Zhenchen(School of Civil Engineering and Transportation,Hebei University of Technology,Tianjin 300401,China)

机构地区：[1]河北工业大学土木与交通学院,天津300401

出　　处：《河北工业大学学报》2021年第2期84-91,共8页Journal of Hebei University of Technology

基　　金：河北省自然科学基金(E2018202173);河北省教育厅重点项目(ZD2018051)。

摘　　要：目前有关无粘结预应力筋极限应力增量的诸多计算方法存在计算复杂或精度较差的问题,基于整体变形的无粘结预应力筋极限应力增量的计算方法有效地解决了这一难题。通过8根无粘结预应力混凝土梁抗弯试验对各国规范中关于无粘结预应力筋极限应力增量的计算方法及现有的基于变形的计算方法进行了对比分析,结果表明:相对于其他计算方法,基于整体变形的无粘结预应力筋极限应力增量的计算方法具备计算简单,结果准确的优点。At present,many methods for calculating the ultimate stress increment of unbonded prestressed tendons have the problems of too complicated calculation or poor accuracy.The method of calculating the ultimate stress increment of unbonded prestressed reinforcement based on the whole deformation effectively solves the problem.A comparative analysis is made between the calculation methods in the national codes of ultimate stress increment of unbonded prestressed tendons and the calculation methods based on overall structure deformation through 8 unbonded prestressed concrete beam bending test.The results show that compared with other calculation methods,the calculation method based on the overall structure deformation has the advantages of simple calculation and accurate results.

关 键 词：无粘结预应力筋 极限应力增量 跨中挠度 结构整体变形 对比分析 

分 类 号：TU378.2[建筑科学—结构工程]