Journal of South China University of Technology (Natural Science Edition) ›› 2011, Vol. 39 ›› Issue (4): 156-162.doi: 10.3969/j.issn.1000-565X.2011.04.027

• Electronics, Communication & Automation Technology • Previous Articles    

Analysis of Key Parameters of Non-Tension Prestressing Technology for Continuous Steel-Concrete Composite Beams

 Wu Li-li1,2  Nie Jian-guo2   

  1. 1.State Key Laboratory for Geomeehanics and Deep Underground Engineering,China University of Mining and Technology(Beijing),Beijing 100083,China;2.Department of Civil EngineeringfKey Laboratory of Civil Engineering Safety and Durability of the Education of Ministry,Tsinghua University,Beijing 100084,Chin
  • Received:2010-04-21 Revised:2010-08-30 Online:2011-04-25 Published:2011-03-01
  • Contact: 吴丽丽(1977-)，女，博士，副教授，主要从事结构工程研究 E-mail:jennywll@163.com
  • About author:吴丽丽(1977-)，女，博士，副教授，主要从事结构工程研究
  • Supported by:

    国家自然科学基金资助项目(50778103，50808110)；中国博士后科学基金资助项目(20080430042)

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Abstract:

By analyzing the loading stages of the continuous steel-concrete composite beams with 2-5 spans,some key parameters of the non-tension prestressing technology of the composite beams,such as the counterweights and their arrangement,as well as the post-cast length of concrete in the negative-moment region,are investigated.Then,the calculation methods of crack width in the negative-moment region and mid-span deformation of the composite beams are discussed after the removal of the counterweights.It is suggested that the reverse deflection induced by the non-tension prestressing can be obtained through two steps,namely,converting the reverse loads resulting from weight removing to the full-span uniform ＂equivalent＂ ones,and then calculating the deflections under the ＂equivalent＂ loads.With this two-step method,the requirements of practical engineering are satisfied well,and the maximum relative error of deflection keeps within 15%.

Key words: continuous steel-concrete composite beam, technology of non-tension prestressing, negative-moment moment region, weights, crack width, deformation