1200d预应力高性能混凝土梁长期性能试验研究  

Experimental Study on Long-Term Behavior of Prestressed HPC Beams for 1 200 Days

作　　者：薛伟辰[1] 胡于明[1] 王巍[1] 任廷柱[2] 

机构地区：[1]同济大学土木工程学院,上海200092 [2]上海市政工程设计研究总院,上海200092

出　　处：《同济大学学报（自然科学版）》2008年第8期1018-1023,共6页Journal of Tongji University:Natural Science

基　　金：建设部研究开发计划资助项目(04-2-026);上海市曙光学者计划资助项目(04SG24);上海市青年科技启明星(跟踪)计划资助项目(06QH14013)

摘　　要：通过6根1∶5模型梁的1 200 d长期试验,对预应力高性能混凝土梁的长期性能进行了较系统的研究与分析,重点考察了预应力筋张拉方式以及截面上、下缘应力差等因素对梁长期挠曲变形、徐变应变、截面曲率、预应力筋应变增量和钢筋应变等的影响.提出了综合考虑预应力筋张拉方式以及截面应力差等多因素影响的、预应力高性能混凝土梁长期挠曲变形设计建议公式,计算结果与试验值的最大误差在10%以内.Experimental and analytical studies are conducted to investigate long-term behavior of 6 models（1：5） of prestressed high performance concrete（HPC）beams for about 1 200 days. The research with an emphasis on the influence of tensioning methods, stress difference between upper and lower fibers of beam sections on long-term deflection, creep strain, cross-section curvature, prestressing tendon strain increment as well as strain stress of models was carried out. Calculations by using this program agree well with the test results. Long-term deflection design suggestion of prestressed HPC beams taking tensioning methods as well as stress difference between upper and lower fibers into account is suggested. The calculated values correspond well with the test results. The error is less than 10 %.

关 键 词：预应力梁 高性能混凝土 试验 长期性能 设计建议 

分 类 号：TU378.2[建筑科学—结构工程]