箱梁桥竖向预应力张拉工艺与张拉时机的研究  

Research on Tension Technique and Stretching Time of Vertical Prestress in a Bridge with Box Girder

作　　者：沈明燕[1] 钟新谷[1] 舒小娟[1] 

机构地区：[1]湖南科技大学,湖南湘潭411201

出　　处：《施工技术》2007年第10期38-40,共3页Construction Technology

基　　金：国家自然科学基金资助(50478099);湖南省教育厅资助科研项目(06C311)

摘　　要：通过有限元分析与试验研究,针对竖向预应力现行的施工缺陷,确定合理的张拉时机。并根据竖向预应力体系特点,结合高强螺栓拧紧工艺,提出拉伸-扭矩法。实践证明此法能较好地克服竖向预应力施工质量差的问题。Based on finite element theoretical analysis and test study, rational stretching time for construction of vertical prestress bars is deduced in this paper, which indicates the disadvantage of present construction method. Furthermore, according to characters of vertical prestress system combining with screw technology of high-strength bolt, stretch-torque construction technique is presented. Practice of such method leads to overcoming the problem of bad construction quality about vertical prestress bars .

关 键 词：腹板开裂 预应力损失 二次张拉 拉伸-扭矩法 

分 类 号：U445[建筑科学—桥梁与隧道工程]