Distribution of Internal Force and Stress in the Arch Ring of Railway Long-span Steel Truss Arch Bridge under Seismic Excitation

ZHANG Yongliang, LIU Haibo, CHEN Xingchong, LIU Congcong

Journal of Railway Engineering Society ›› 2021, Vol. 38 ›› Issue (3) : 35-40.

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Journal of Railway Engineering Society ›› 2021, Vol. 38 ›› Issue (3) : 35-40.
Main Line: Bridge Engineering

Distribution of Internal Force and Stress in the Arch Ring of Railway Long-span Steel Truss Arch Bridge under Seismic Excitation

  • ZHANG Yongliang, LIU Haibo, CHEN Xingchong, LIU Congcong
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Abstract

Research purposes: In order to study distribution characteristics of internal forces and stresses in arch ring of complex long-span steel truss arch bridge under seismic excitation, a deck-type steel truss arch bridge with a span of 490 m was taken as the research object. The model of the whole bridge was established by using Midas/Civil finite element software, the distribution law of internal force and stress of the arch ring chord under constant load and earthquake action, the relation of mutual proportion and seismic weak position were systematically analyzed.
Research conclusions: (1)Under the excitation of rare earthquakes, the upper chord in the arch foot region and the lower chord in the arch top region will produce larger dynamic axial force, which is one of the important factors that make the seismic damage of long-span arch bridge develop to the extreme. (2)For the upper chord, the bending moment distribution is characterized by multiple peaks, and the peak point corresponds to the position of the upper arch column.(3)Under the transverse + vertical seismic action, the upper chord is subjected to larger axial force and in-plane and out-plane bending moment, which reflects obvious spatial coupling characteristics. (4)The lower chord is the tension and compression member, and the axial force is the main control component of the internal force; The upper chord is a compression and flexural member in some areas, and it also bears great axial force and bending moment.(5)The lower chord in the arch foot area, the upper chord in the intersection of L/4 ~ 3L/4 area and the upper arch column is the weak seismic position.(6)The research result can be applied to the seismic design of railway steel truss arch bridge.

Key words

long-span steel truss arch bridge / internal force and stress / dynamic axial force / spatial coupling / seismic weak position

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ZHANG Yongliang, LIU Haibo, CHEN Xingchong, et al. Distribution of Internal Force and Stress in the Arch Ring of Railway Long-span Steel Truss Arch Bridge under Seismic Excitation[J]. Journal of Railway Engineering Society, 2021, 38(3): 35-40

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