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Article Navigation >  Journal of Traffic and Transportation Engineering  > 2020  >  20(6): 104-116
JIANG Lei, LIU Yong-jian, LONG Xin, WANG Wen-shuai, MA Yin-ping. Fatigue assessment of joints in concrete-filled rectangular hollow section composite truss bridges based on hot spot stress method[J]. Journal of Traffic and Transportation Engineering, 2020, 20(6): 104-116. doi: 10.19818/j.cnki.1671-1637.2020.06.009
Citation: JIANG Lei, LIU Yong-jian, LONG Xin, WANG Wen-shuai, MA Yin-ping. Fatigue assessment of joints in concrete-filled rectangular hollow section composite truss bridges based on hot spot stress method[J]. Journal of Traffic and Transportation Engineering, 2020, 20(6): 104-116. doi: 10.19818/j.cnki.1671-1637.2020.06.009
shu

Fatigue assessment of joints in concrete-filled rectangular hollow section composite truss bridges based on hot spot stress method

doi: 10.19818/j.cnki.1671-1637.2020.06.009
  • 1.

    School of Highway, Chang'an University, Xi'an 710064, Shaanxi, China

  • 2.

    Department of Civil Engineering, Queen's University, Kingston K7L3N6, Ontario, Canada

Funds:

National Natural Science Foundation of China 52008026

National Natural Science Foundation of China 51778058

Fundamental Research Funds for the Central Universities 300102219310

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    Abstract
  • In order to accurately assess the fatigue behaviour of joints in concrete-filled rectangular hollow section steel tubular composite truss bridges, the hot spot stress method was introduced. The hot spot stress range at the weld toe can be determined by the planar frame model, spatial frame model, and three-dimensional solid model. Based on 52 fatigue test data of joints, the hot spot stress range-cycle number curves were obtained through the regression analysis. A concrete-filled rectangular hollow section steel tubular composite truss bridge located at the Huangyan highway was selected as the typical case, the fatigue behaviour of the joint was assessed, and original design details were optimized. Research results show that compared with the concrete-filled rectangular hollow section steel tubular joint on the top of the pier, the hot spot stress range in the rectangular hollow section joint at mid-span is higher, which equals to 60.1 MPa, and occurs on the main surface of the chord. However, it is less than the allowable value of 71 MPa determined according to Eurcode, thereby the design of the joints met the requirements. The optimization of design details on the fatigue vulnerable joint at mid-span is carried out. After filling the hollow section with concrete, the local joint stiffness changed, resulting in a more uniform stress distribution at the weld toe intersection. The hot spot stress ranges of brace and chord surface decrease by 25.1% on average. The post-weld treatment of the original designed joint can effectively eliminate the initial tensile stress of the welding and improve the fatigue performance of the joint. The hot spot stress ranges in the brace and chord surface decreased by 14.9% on average. Using spatial frame model to assess the fatigue behaviour of optimized joint at mid-span, the maximum hot spot stress ranges on the brace and chord are 58.9 and 54.1 MPa, respectively, both less than the results of 45.2 and 47.1 MPa calculated by using the three-dimensional solid model. It demonstrats that the result obtained by using the spatial frame model is more conservative, and the fatigue effects of different hot spots can not be calculated as accurately as the three-dimensional solid model, nor can the initial position of fatigue cracking be judged accurately.

     

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