Study on equal stiffness design of arch bridge suspenders and its dynamic response analysis

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Journal of Vibration and Shock ›› 2018, Vol. 37 ›› Issue (4) : 219-225.

Shao Yuan1.2 Sun Zong-guang1 Chen Yi-fei1

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Abstract

According to condition of the short suspenders in half-through arch bridge structure are easier to be ruined firstly, the stiffness difference of each suspender departments is analyzed. Taking a half-through concrete-filled-steel-tube arch bridge as the object of study, the elastic modulus of suspender element is adjusted to make the equal stiffness design. The stress response curve of suspenders is obtained and the impact coefficient is calculated under the vehicle load with vehicle-bridge coupling method. Compared with the initial model, dynamic response of arch bridge suspenders is analyzed. The results show that the stress of short span is apparent decline in equal stiffness model and the stress difference of each suspender is reduce; the suspender impact coefficient is reduce and the difference between short and long suspender is reduced as high as 50%; the amplification of roughness level on impact coefficient does not change with stiffness adjustment. It is shown that equal stiffness design for arch bridge suspenders can effectively balance the suspender stress, and make the impact effect more uniform. The durability of suspenders is enhanced to provide the basis for practical engineering application.

Key words

Arch bridge / Suspenders / Equal stiffness design / Vehicle-bridge coupling / Dynamic response

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Shao Yuan1.2 Sun Zong-guang1 Chen Yi-fei1. Study on equal stiffness design of arch bridge suspenders and its dynamic response analysis[J]. Journal of Vibration and Shock, 2018, 37(4): 219-225

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