基于乌龙江大桥的预应力配筋方案优化研究  

Optimization of Prestressed Reinforcement Scheme of Wu Long River Bridge

作　　者：舒彬[1] 郝付军[2] 杨敏 Shu Bin Hao Fujun Yang Min(Shaanxi Railway Institute,Weinan 714000,Shaanxi China Chang’an University,Xi’an 710000,China Yunnan Science ＆ Technology Research Institute of Highway,Kunming 650051,China)

机构地区：[1]陕西铁路工程职业技术学院,陕西渭南714000 [2]长安大学,西安710000 [3]云南省公路科学技术研究院,昆明650051

出　　处：《河南科学》2016年第11期1863-1868,共6页Henan Science

基　　金：陕西省自然科学基础研究计划项目(2016JM5030);中央高校基本科研业务费资助项目(310821161118);陕西铁路工程职业技术学院项目基金(KY2015-43)

摘　　要：多跨度连续箱梁桥采用水平向直线预应力筋和竖向预应力筋相结合,取消下弯筋,施工方便;但竖向预应力筋较短,预应力损失较大,主拉应力实际上不能完全抵消,腹板斜截面容易出现裂缝,影响结构的正常使用.曲线预应力筋较长,后期预应力损失较小.乌龙江大桥采用了主要依靠曲线预应力抵抗主拉应力和竖向预应力作为安全储备的配筋方式,大桥实测和分析表明其有效预应力可靠性高,在设计中应加以推广.This paper uses a large span continuous box girder bridge which is combined with linear and verticalprestressed tendons and cancels the recurved ribs which is convenient for construction. But because of the shortervertical tendons and the prestressed greater losses,the main tensile stress can not be actually fully offsetted and theweb oblique section prone to cracks in abnormal structure using. We find the curve prestressed tendons are longerand the late loss of prestressed is less. Wulong River Bridge mainly takes the curved prestressed resistanceprincipal tensile stress and vertical prestressed reinforcement approach as a safety reserve which shows effectiveprestressed high reliability in measurement and analysis. The approach should be promoted in the design .

关 键 词：腹板斜裂缝 主拉应力 竖向预应力筋 水平直线预应力筋 曲线预应力筋 

分 类 号：U448.35[建筑科学—桥梁与隧道工程] U443.38[交通运输工程—道路与铁道工程]