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Aerodynamic impact of train-induced wind on a moving motor-van

Frontiers of Structural and Civil Engineering 2022年第7期16卷 909-927页

作者： Jiajun HE Huoyue XIANG Yongle LI Bin HAN Southwest Municipal Engineering Design and Research Institute of China Chengdu 610299China Department of bridge Engineering Southwest Jiaotong UniversityChengdu 610031China Wind Engineering Key Laboratory of Sichuan Province Southwest Jiaotong UniversityChengdu 610031China Sichuan railway Investment Group Co. Ltd.Chengdu 610093China

The newly-built single-level rail-cum-road bridge brings the issue of the aerodynamic impact of train-induced wind on road automobiles.This research introduced a validated computational fluid dynamics(CFD)model regarding this concern.Such an aerodynamic impact mechanism was explored;a relationship between the transverse distance between train and motor-van(hereinfafter referred to as van)and the aerodynamic effects on the van was explored to help the optimization of bridge decks,and the relationship between the automobile speed and aerodynamic variations of a van was fitted to help traffic control.The fitting results are accurate enough for further research.It is noted that the relative speed of the two automobiles is not the only factor that influences the aerodynamic variations of the van,even at a confirmed relative velocity,the aerodynamic variations of the van vary a lot as the velocity proportion changes,and the most unfavorable case shows an increase of over 40%on the aerodynamic variations compared to the standard case.The decay of the aerodynamic effects shows that not all the velocity terms would enhance the aerodynamic variations;the coupled velocity term constrains the variation amplitude of moments and decreases the total amplitude by 20%–40%.

关键词： rail-cum-road bridge aerodynamic impact train-induced wind CFD aerodynamic force quantitative analysis fitting

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Fatigue evaluation of steel-concrete composite deck in steel truss bridge—A case study

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Frontiers of Structural and Civil Engineering 2022年第10期16卷 1336-1350页

作者： Huating CHEN Xianwei ZHAN Xiufu ZHU Wenxue ZHANG Faculty of Urban Construction Beijing University of TechnologyBeijing 100021China Tai’an High-tech Industrial Development Zone Management Committee Tai’an 271000China

An innovative composite deck system has recently been proposed for improved structural performance.To study the fatigue behavior of a steel-concrete composite bridge deck,we took a newly-constructed rail-cum-road steel truss bridge as a case study.The transverse stress history of the bridge deck near the main truss under the action of a standard fatigue vehicle was calculated using finite element analysis.Due to the fact that fatigue provision remains unavailable in the governing code of highway concrete bridges in China,a preliminary fatigue evaluation was conducted according to the fib Model Code.The results indicate that flexural failure of the bridge deck in the transverse negative bending moment region is the controlling fatigue failure mode.The fatigue life associated with the fatigue fracture of steel reinforcement is 56 years.However,while the top surface of the bridge deck concrete near the truss cracks after just six years,the bridge deck performs with fatigue cracks during most of its design service life.Although fatigue capacity is acceptable under design situations,overloading or understrength may increase its risk of failure.The method presented in this work can be applied to similar bridges for preliminary fatigue assessment.

关键词： Fatigue assessment composite bridge deck rail-cum-road bridge fatigue stress analysis Model Code

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