Stress and deformation of seamless CWR on large-span cable-stayed bridge under static wind load

ZHANG Pengfei, WEN Yue, LI Zhaoquan

Journal of Vibration and Shock ›› 2024, Vol. 43 ›› Issue (3) : 7-13.

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Journal of Vibration and Shock ›› 2024, Vol. 43 ›› Issue (3) : 7-13.

Stress and deformation of seamless CWR on large-span cable-stayed bridge under static wind load

  • ZHANG Pengfei, WEN Yue, LI Zhaoquan
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Abstract

Long span cable-stayed bridges are prone to displacement and deformation due to beam flexibility in natural wind field, in order to study the distribution law of mechanical properties of bridge and track structures of CRTS double slab ballastless track continuous welded rails (CWR) on the long-span cable-stayed bridge under static wind load. taking a four line prestressed concrete cable-stayed bridge as the engineering background, a refined spatial coupling model of CWR on long-span cable-stayed bridge is established based on finite element method, and the mechanical properties of bridge system and track structures on the bridge under transverse static wind load are analyzed. The analysis results show that the maximum of the three direction forces (stresses) of the bridge and the track structures on the bridge is basically distributed in the middle span and near the side pier of the cable-stayed bridge; In the three direction forces (stresses) of each structures, the longitudinal stress peak of the base plate and bridge structure is the largest, about 8 times of the transverse stress peak, and about 7 and 13 times of the vertical stress peak, the transverse stress of track plate shows the maximum peak value, and the gap with the peak value of the other two direction stresses is small; In the three direction displacements of each structures, the transverse and vertical displacements reach the maximum at and near the middle of the span, and the longitudinal displacement reaches the maximum near the side pier of the cable-stayed bridge, among them, the peak value of lateral displacement is more than 20 times that of the other two directions; The vertical and longitudinal displacement directions of the structures on both sides of the bridge are opposite, that is, the bridge is inclined to overturn and bend under the action of static wind. The research results can provide a theoretical basis for the design, maintenance, and health monitoring of long span cable-stayed bridges in wind environment.

Key words

High Speed Railway / Long span Cable-stayed Bridge / Static Wind Load / Track Structure on Bridge

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ZHANG Pengfei, WEN Yue, LI Zhaoquan. Stress and deformation of seamless CWR on large-span cable-stayed bridge under static wind load[J]. Journal of Vibration and Shock, 2024, 43(3): 7-13

References

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