混凝土徐变模式对连续梁桥预拱度计算的影响

A Research of the Influence of Concrete Creep Mode on the Pre-camber Calculation of Continuous Beam Bridge

混凝土徐变是混凝土连续梁桥预拱度计算的一项主要内容。从徐变模式出发,综合比较了国内1985年与2004年《公路钢筋混凝土及预应力混凝土桥涵设计规范》新旧桥规徐变模式的差异。以某高速公路上的1座大跨度连续梁桥为项目背景,建立有限元模型,对不同徐变模式下的预拱度计算结果进行对比,得到:1985年桥规徐变计算结果较2004年桥规大;预拱度的设置,宜遵循"宁高勿低"的原则。

Concrete creep is a main part of pre-camber calculation of concrete continuous beam bridge.Based on creep mode,the differences of Code for Designs of Highway Reinforced Concrete & Prestressed Concrete Bridges & Culverts in 1985 and in 2004 are compared comprehensively.Taking a large span continuous beam bridge on an expressway and building a related finite element model,the pre-camber calculation results under different creep modes are made a contrast,then,the conclusions show that 1) the creep calculation results by the code in 1985 are more than the results in 2004;2) the setting up of pre-camber should obtain the principle of 'better to be high than to be low'.