Journal of South China University of Technology (Natural Science Edition) ›› 2013, Vol. 41 ›› Issue (6): 63-68.doi: 10.3969/j.issn.1000-565X.2013.06.011

• Architecture & Civil Engineering • Previous Articles     Next Articles

Analysis of Web Cracks of Continuous Box- Beam Bridges with a Constant Cross- Section Based on ANSYS

He Zhi- yong1,2  Yang Chu1 Zhang Jian- jun3   

  1. 1.School of Civil Engineering and Transportation,South China University of Technology,Guangzhou 510640,Guangdong,China;2.State Key Laboratory of Subtropical Building Science,South China University of Technology,Guangzhou 510640,Guangdong.China; 3.Zhuhai Traffic Survey and Design Institute Co.,Ltd.,Zhuhai 519000,Guangdong,China
  • Received:2012-09-25 Revised:2013-03-15 Online:2013-06-25 Published:2013-05-03
  • Contact: 贺志勇(1964-)，男，副教授，主要从事结构健康监测系统研究． E-mail:zhyhe@scut.edu.cn
  • About author:贺志勇(1964-)，男，副教授，主要从事结构健康监测系统研究．
  • Supported by:

    华南理工大学亚热带建筑科学国家重点实验室开放研究项目(2011KB14)

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Abstract:

On web crack,one of the major problems existing in pre- stressed concrete continuous box- beam bridges,few studies have been conducted.In this paper,according to the monitoring results of a continuous box- beam bridge with constant cross- section,the major tensile stresses in the web with different thickness were discussed withthe finite element software ANSYS,and the causes of cracks were analyzed.Moreover,some reinforcement mea-sures such as employing steel plate and sealing epoxy resin were taken,and the reinforcement effect was finally con-firmed by observations. The results show that the crack is greatly related to the web thickness and the web steel,so that the web thickness should be larger than 60cm; and that,after the reinforcement,there is no crack propagation and appearance in width and length directions,which means that the proposed reinforcement measures can effec-tively control further development of diagonal cracks of web and possess high feasibility and effectiveness.

Key words:  continuous box- beam bridge, constant cross- section, web crack, ANSYS, reinforcement

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