中美规范下大跨径梁桥混凝土结合面收缩效应比较

李小祥; 石雪飞; 阮欣; 冯电视

doi:10.11835/j.issn.1674-4764.2009.05.016

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中美规范下大跨径梁桥混凝土结合面收缩效应比较

更新时间：2023-11-28

- 中美规范下大跨径梁桥混凝土结合面收缩效应比较
- Comparison on Shrinkage Effects at Concrete Interfaces in LongSpan Girder Bridges between Chinese and American Codes
- 土木与环境工程学报（中英文） 2009年31卷第5期页码：86-89
- 作者机构：
  
  同济大学桥梁工程系,上海,200092
- 作者简介：
- 基金信息：
  
  国家高技术研究发展计划（863计划）专题课题（2007AA11Z103）
- DOI：10.11835/j.issn.1674-4764.2009.05.016
  中图分类号：
- 纸质出版：2009
- 稿件说明：
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李小祥, 石雪飞, 阮欣, 等. 中美规范下大跨径梁桥混凝土结合面收缩效应比较[J]. 土木与环境工程学报（中英文）, 2009,31(5):86-89.

LI Xiaoxiang, SHI Xuefei, RUAN Xin, et al. Comparison on Shrinkage Effects at Concrete Interfaces in LongSpan Girder Bridges between Chinese and American Codes[J]. Journal of Civil and Environmental Engineering, 2009, 31(5): 86-89.
李小祥, 石雪飞, 阮欣, 等. 中美规范下大跨径梁桥混凝土结合面收缩效应比较[J]. 土木与环境工程学报（中英文）, 2009,31(5):86-89. DOI： 10.11835/j.issn.1674-4764.2009.05.016.

LI Xiaoxiang, SHI Xuefei, RUAN Xin, et al. Comparison on Shrinkage Effects at Concrete Interfaces in LongSpan Girder Bridges between Chinese and American Codes[J]. Journal of Civil and Environmental Engineering, 2009, 31(5): 86-89. DOI： 10.11835/j.issn.1674-4764.2009.05.016.

摘要

基于中国和美国规范，研究了因混凝土龄期不同而带来的收缩特性差异对大跨径连续刚构桥典型结合面部位混凝土应力分布的影响，并分析了2种规范下计算结果存在较大差异的原因。结果表明：对于厚度大的混凝土构件，AASHTO规范的收缩效应计算结果更加合理。当浇筑时间间隔较长时，结合面部位混凝土极易开裂。而依据JTGD 622004规范，混凝土不同浇筑时间间隔下，结合面的应力始终较小，而截面突变位置的应力相对更为明显。有必要对JTGD 622004中理论厚度规定一上限，建议h≤300 mm。还提出了一些避免此类裂缝的设计和施工对策。

Abstract

Stress

due to shrinkage characteristic difference resulting from different concrete age at typical interface parts in long span rigidframe bridges

was analyzed based on Chinese and American codes. Reasons for large discrepancy between results under the two codes were also discussed. It was shown that shrinkage stress level calculated under AASHTO was more reasonable than that under Chinese code (JTGD 622004) for concrete members with large thickness. Concrete at interface parts was easy to crack when casting time interval was long. According to JTGD 622004

stress at interfaces was always small under different casting time intervals

while stress at position with mutation section was more significant. It was necessary to set an upper limit to theoretical thickness in JTGD 622004

and 300 mm was recommended. Finally

some design and construction approaches were put forward.

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