Journal of South China University of Technology (Natural Science Edition) ›› 2017, Vol. 45 ›› Issue (12): 128-134.doi: 10.3969/j.issn.1000-565X.2017.12.019

• Architecture & Civil Engineering • Previous Articles     Next Articles

Experimental Investigation into Mechanical Performance of Steel-Concrete Composite Beams with Fatigue Damage

YANG Tao1,2,3 LIN Guang-tai1 ZHAO Yan-lin1,2,3 PENG Xiu-ning1,2,3   

  1. 1.College of Civil Engineering and Architecture,Guangxi University,Nanning 530004,Guangxi,China; 2.Guangxi Key Laboratory of Disaster Prevention and Engineering Safety,Guangxi University，Nanning 530004,Guangxi,China; 3.Key Laboratory of Disaster Prevention and Structural Safety of Ministry of Education， Guangxi University,Nanning 530004,Guangxi,China
  • Received:2016-12-27 Revised:2017-06-24 Online:2017-12-25 Published:2017-10-31
  • Contact: 赵艳林(1958-)，男，教授，主要从事结构分析理论与方法研究． E-mail:zhaoyanlin@gxu.edu.cn
  • About author:杨涛(1979-)，男，博士后，副教授，主要从事混凝土结构和组合结构研究． E-mail:yangt@gxu．edu．cn
  • Supported by:
    Supported by the Guangxi Natural Science Foundation Program(2014GXNSFBA118258)，and the Guangxi Key Science and Technology Program(1598009-1)

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Abstract: Steel-concrete composite beams are widely used in bridge structures and fatigue damage caused by vehicle loads will accumulate gradually, which is adverse to the structure safety. To study the influence of fatigue damage on the mechanical performance of steel-concrete composite beams, monotonic static tests were conducted on seven composite beams, including five composite beams previously suffered 1,000,000 cycles of constant amplitude fatigue loading. Experimental results indicated that fatigue damage due to 1,000,000 cycles of fatigue loading caused the reduction of ultimate deformability of the composite beams. However, the ductility coefficients were still greater than 4.6 and the final failure patterns belonged to flexible failures. Fatigue loading led to the strengthening effect of steel material and the yielding loads of the composite beams improved correspondingly. The ultimate bearing capacities of the composite beams with partial shear connection generally reduced and the maximum drop reached 7.3% of the initial ultimate bearing capacity. Using studs with 13mm or 16mm in diameter has no significant effect on the bearing capacity of the composite beams when they possess the same shear connection degree.

Key words: Steel-concrete composite beams, fatigue damage, shear connection, mechanical performance

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