Volume 22 Issue 6
Dec.  2022
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WANG Chun-sheng, MAO Yu-bo, LI Pu-yu, ZHU Chen-hui. Digital fatigue test of detail group at deck-U rib-diaphragm access hole of steel bridge deck in cable-stayed bridge[J]. Journal of Traffic and Transportation Engineering, 2022, 22(6): 67-83. doi: 10.19818/j.cnki.1671-1637.2022.06.004
Citation: WANG Chun-sheng, MAO Yu-bo, LI Pu-yu, ZHU Chen-hui. Digital fatigue test of detail group at deck-U rib-diaphragm access hole of steel bridge deck in cable-stayed bridge[J]. Journal of Traffic and Transportation Engineering, 2022, 22(6): 67-83. doi: 10.19818/j.cnki.1671-1637.2022.06.004
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Digital fatigue test of detail group at deck-U rib-diaphragm access hole of steel bridge deck in cable-stayed bridge

doi: 10.19818/j.cnki.1671-1637.2022.06.004

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

Funds:

National Natural Science Foundation of China 51578073

Innovation Capability Support Program of Shaanxi Province 2019TD-022

More Information
  • Author Bio:

    WANG Chunsheng (1972–), male, from Suihua city, Heilongjiang Province; professor of Chang'an University, PhD. He is mainly engaged in the research of steel bridges and composite beam bridges. E-mail: wcs2000wcs@163.com

  • Received Date: 2022-05-17
  • Publish Date: 2022-12-25
    Abstract
  • To investigate the fatigue crack propagation mechanism of steel bridge deck in cable-stayed bridges under the multi-field coupling effect, a model for the multi-scale digital fatigue test of the whole cable-stayed bridge was constructed. The entire welding process of the multi-pass welds at the detail group at the deck-U rib-diaphragm access hole was simulated to introduce the welding residual stress into the model for the digital fatigue test. The digital fracture parameter analysis and the digital fatigue test were conducted under the multi-field coupling effect by the extended finite element method to clarify the propagation mechanism and propagation behavior of typical fatigue cracks of the detail group at the deck-U rib-diaphragm access hole. Research results show that the high residual tensile stress can be observed at the detail group at the deck-U rib-diaphragm access hole, with a maximum being close to the yield strength of steel. The influence of the welding residual stress on the fatigue performance of the steel bridge deck cannot be ignored. Subsequent welds affect the stress field distribution in the existing weld area. Therefore, the entire welding process needs to be simulated when the welding residual stress field in the influence range of multi-pass welds is analyzed and calculated. Under the multi-field coupling effect of dead-load stress field, live-load stress field and welding residual stress field, the maximum equivalent stress intensity factor ranges of four typical types of fatigue cracks of the detail group at the deck-U rib-diaphragm access hole are all larger than the fatigue crack propagation threshold according to the engineering criterion for the propagation of mixed cracks. In this case, the four types of fatigue cracks all propagate under the cyclic fatigue loading. Under the multi-field coupling effect, the fatigue cracks initiating from the deck-side weld toe of the deck-to-U rib welded joint above the access hole and those initiating from the U rib-side weld toe of the U rib-to-diaphragm welded joint are all mixed cracks of modes Ⅰ, Ⅱ, and Ⅲ dominated by mode-Ⅰ cracks. Nevertheless, the influences of mode-Ⅱ and mode-Ⅲ cracks cannot be overlooked. The fatigue cracks initiating from the deck-side weld root of the deck-to-U rib welded joint above the access hole and those initiating from the edge of the diaphragm access hole are all mode-Ⅰ cracks. The muti-scale digital fatigue test constructed under the multi-field coupling effect can provide analysis and simulation methods for the fatigue crack propagation in the steel bridge deck of a long-span bridge in operation. 1 tab, 28 figs, 32 refs.

     

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