Effects of composite spatial cables on transverse stiffness of a long-span railway suspension bridge

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Journal of Vibration and Shock ›› 2024, Vol. 43 ›› Issue (11) : 148-154.

XIANG Huoyue1,2, TAO Yu2, WANG Zhen2, ZHONG Jinkun2, LI Yongle1,2

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Abstract

To enhance transverse stiffness of a long-span railway suspension bridge, a composite-spatial cable structure consisting of main and secondary diagonal cables is proposed. Then, the parameters of diameter of composite-spatial cables, anchorages of main diagonal cables with stiffening beams and the surface, and the number of secondary diagonal cables on transverse deflection-span ratio of the bridge are optimized by the effective utilization of the materials and static analysis method. Finally, the analysis method for coupling vibrations of wind-vehicle-bridge system is used to obtain the limit of transverse deflection-span ratio of the bridge based on the driving performance, and the influence of the main and secondary diagonal cables on the enhancement rate of the limit of transverse deflection-span ratio is analyzed. The results show that on the basis of considering the effective utilization rate of composite-spatial cables, anchorages of main diagonal cables and stiffened beams should be located near 1/4 of the main span, and it is optimal when the vertical distance between anchorages of main diagonal cables with stiffening beams and the surface and the tower is equal, and it is enough to set a secondary diagonal cable for each group of composite-spatial cables; in the optimal layout of composite-spatial cables, transverse deflection-span ratio of the bridge can be reduced by 14.18%, the limit of transverse deflection-span ratio can be increased by 16.79%.

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composite-spatial cable / railway suspension bridge / wind-vehicle-bridge system / transverse deflection-span ratio / the limit of transverse deflection-span ratio

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XIANG Huoyue1,2, TAO Yu2, WANG Zhen2, ZHONG Jinkun2, LI Yongle1,2. Effects of composite spatial cables on transverse stiffness of a long-span railway suspension bridge[J]. Journal of Vibration and Shock, 2024, 43(11): 148-154

References

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