Analysis of Differential Shrinkage Deflection for PC Boxgirder Bridges

HUANG Haidong; XIANG Zhongfu; ZHENG Jielian

doi:10.11835/j.issn.1674-4764.2009.04.012

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Analysis of Differential Shrinkage Deflection for PC Boxgirder Bridges

更新时间：2023-11-28

- Analysis of Differential Shrinkage Deflection for PC Boxgirder Bridges
- Journal of Civil and Environmental Engineering Vol. 31, Issue 4, Pages: 60-65(2009)
- 作者机构：
  
  1. 广西大学土木建筑学院,南宁,530004
  3. 重庆交通大学土木建筑学院,重庆,400074
  4. 广西壮族自治区交通厅,广西,南宁,53001
- 作者简介：
- 基金信息：
- DOI：10.11835/j.issn.1674-4764.2009.04.012
  CLC：
- Published：2009
- 稿件说明：
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HUANG Haidong, XIANG Zhongfu, ZHENG Jielian. Analysis of Differential Shrinkage Deflection for PC Boxgirder Bridges[J]. Journal of Civil and Environmental Engineering, 2009, 31(4): 60-65.
DOI：

HUANG Haidong, XIANG Zhongfu, ZHENG Jielian. Analysis of Differential Shrinkage Deflection for PC Boxgirder Bridges[J]. Journal of Civil and Environmental Engineering, 2009, 31(4): 60-65. DOI： 10.11835/j.issn.1674-4764.2009.04.012.

摘要

大跨预应力连续刚构桥后期超限下挠问题，越来越受到工程界的普遍关注。文中以湿度扩散理论为基础，研究PC箱梁结构非均匀收缩变形计算方法。针对某实桥典型截面建立二维湿度场分析有限元模型，分析箱梁截面二维湿度场分布规律及时变特征。根据湿度场变形耦合条件研究连续刚构桥主梁干缩变形行为特点。结果表明，PC箱梁结构非均匀收缩变形显著，常规方法计算误差较大。考虑箱梁截面非均匀收缩因素后，跨中下挠累计值较常规方法大3.1 cm，表明箱梁截面的不均匀收缩是引起连续刚构桥后期超限下挠的重要原因。

Abstract

The long term deflection behavior of longspan continuous rigid frame bridges has often attracted the attentions in engineering field. Based on the moisture diffusion theory

the calculation method of differential shrinkage deflection was proposed for PC boxgirder bridges. Finite Element Method(FEM) model of 2D moisture field were established for typical cross sections of a case bridge. And the distribution law and the timevariation characteristics of moisture field were analyzed. Through the deformation coupling condition of moisture field

the drying shrinkage deflection of the bridge was calculated and analyzed. It was found that the differential shrinkage deformation was significant and great error would be with the conventional method. When considering the effect of differential shrinkage

the deflection in midspan was 3.1cm larger than that of the conventional method. Thus

the differential shrinkage was the main reason for long term deflection of longspan continuous rigid frame bridges.

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