四跨混凝土连续刚构桥预应力损失时效分析  

Time-dependent Analysis of Prestress Loss of Four-spans Prestressed Concrete Continuous Frame Bridge

作　　者：姚正中 李银斌[2] 杨鸿波[2] 张惠安[2] 

机构地区：[1]贵州高速公路集团有限公司,贵州贵阳550002 [2]贵州省交通规划勘察设计研究院股份有限公司,贵州贵阳550001

出　　处：《公路工程》2014年第3期134-139,共6页Highway Engineering

摘　　要：根据《公路钢筋混凝土及预应力混凝土桥涵设计规范》(JTG D62—2004)和美国AASHTO LRFD桥梁设计规范提供的混凝土徐变系数和收缩应变计算公式,运用Midas/Civil软件对比分析了贵州赫章特大桥在不同阶段下预应力损失及其对主梁变形的影响。结果表明,按2种规范计算得到的预应力管道摩阻损失基本相同,由锚具变形、弹性压缩和预应力筋应力松弛引起的预应力损失,AASHTO LRFD规范计算值略大于JTG D62—2004,然而由于2种规范在混凝土徐变、收缩计算公式上的不同,按照AASHTO LRFD规范计算由混凝土徐变收缩引起的预应力损失和主梁变形较JTG D60—2004大。According to different concrete coefficient of creep and shrinkage formulation specified in ＇ Code for Design of Highway Reinforced Concrete and Prestressed Concrete Bridges and Culverts（ JTG D62-2004） ＇ and American bridge Specification AASHTO LRFD, the losses of pre-stress and deforma- tions of main girder on different stages for Guizhou Hezhang super long-span bridge were analyzed using finite element analysis software Midas/Civil. Results show that losses of pre-stress caused by pipeline friction are roughly same according to the two specifications. , losses of pre-stress caused by anchorage deformation, elastic compression, pre-stress relaxing, the results of AASHTO LRFD is slightly greater than that of JTG D62-2004. Besides, due to the differences in formula of concrete creep and shrink, the values of losses of pre-stress and deformations of main girder calculated by AASHTO LRFD is much big- ger than that of JTG D62-2004.

关 键 词：连续刚构桥 赫章特大桥 徐变系数 收缩应变 预应力损失 时效分析 主梁变形 

分 类 号：U448.35[建筑科学—桥梁与隧道工程] U441.5[交通运输工程—道路与铁道工程]