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首页> 外文期刊>Magazine of Concrete Research >Numerical simulation of creep and shrinkage in widened concrete bridges
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Numerical simulation of creep and shrinkage in widened concrete bridges

机译：加宽混凝土桥梁蠕变和收缩的数值模拟

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摘要

Creep and shrinkage of concrete can cause cracking or damage when original old bridges that are widened directly by new bridges in a lateral direction experience constrained stress and deformation. This paper presents a numerical method to evaluate creep and shrinkage based on Newmark's methods. In addition, an example of an actual bridge widening process was analysed to obtain displacement and stress redistribution and compared with calculations from a finite-element method. The results validate the precision of the numerical method and show that the displacement of the new and old bridges, as well as the stress exerted on them, will not lead to concrete cracking. However, creep and shrinkage make significant contributions in the first 3 months and therefore it is suggested that bridge widening is carried out when new bridges are 3 months old.
机译：当原来的旧桥在横向方向上被新桥直接加宽时，混凝土的蠕变和收缩会导致开裂或损坏，从而限制了应力和变形。本文提出了一种基于Newmark方法评估蠕变和收缩的数值方法。此外，还分析了一个实际桥梁加宽过程的示例，以获取位移和应力重新分布，并与有限元方法的计算结果进行了比较。结果验证了数值方法的准确性，并表明新旧桥梁的位移以及施加在其上的应力不会导致混凝土开裂。但是，蠕变和收缩在最初的3个月中起了很大的作用，因此建议当新的桥梁使用3个月时进行桥梁加宽。

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  • 来源
    《Magazine of Concrete Research》 |2014年第14期|661-673|共13页
  • 作者

    Qing-Jie Wen; Hong-Wen Jing;

  • 作者单位

    School of Architecture and Civil Engineering, State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining & Technology, Xuzhou, China;

    School of Architecture and Civil Engineering, State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining & Technology, Xuzhou, China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
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