Analysis of suspension cable force of large-span steel tube concrete tied arch bridge

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Journal of Vibration and Shock ›› 2023, Vol. 42 ›› Issue (17) : 306-313.

WANG Xianyu1,2, WANG Xingwu2, LIANG Xiao3, ZHOU Min4, DU Yongfeng1

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Abstract

Aiming at the problem of hanger forces of long-span concrete-filled steel tube tied arch bridges, the solution to this problem should be based on the derivation of the cable force formulas with different constraints which is based on the energy method, combined with engineering examples. System analysis and corresponding optimization suggestions should also be given in three aspects: Firstly, the optimization of the cable force during the design phase of the suspender. Secondly, the actual measurement of the cable force during the bridge formation. Thirdly, the influence of the bending stiffness of the cable force in the operation stage. The analysis results show that the cable force formula derived by the energy method is feasible. After optimization in the design phase, the cable force of the boom is more uniform and the displacement of the tie beam is more reasonable. When the frequency method is used to test the cable force of the boom, the test point should be placed At L/6~L/4 of the boom, which should be stayed as far away from the two ends of the boom as possible and avoid placing it at the modal node of the formation to reduce the impact of the low-frequency signal at the end on the fundamental frequency and the phenomenon of "leakage". There is a difference between the calculated flexural stiffness of the suspender and the actual flexural stiffness in the operation stage, which leads to the great difference between the measured cable force and the actual structural cable force. Aiming at this problem, the method of measuring the actual flexural stiffness of the suspender in the completion stage is proposed, which effectively reduces the measurement error of cable force, and provides calculation basis for accurate measurement of cable force in bridge operation stage.

Key words

Concrete filled steel tube tied arch bridge / Energy method / optimization / Suspender cable force / Frequency method / Bending stiffness

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WANG Xianyu1,2, WANG Xingwu2, LIANG Xiao3, ZHOU Min4, DU Yongfeng1. Analysis of suspension cable force of large-span steel tube concrete tied arch bridge[J]. Journal of Vibration and Shock, 2023, 42(17): 306-313

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