Evaluation model and method for vertical bending stiffness of&nbsp; a cable-stayed bridge without backstays

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Journal of Vibration and Shock ›› 2018, Vol. 37 ›› Issue (19) : 104-111.

Evaluation model and method for vertical bending stiffness of a cable-stayed bridge without backstays

CAI Xiangyang1, SU Xiaoyang2, KANG Houjun2, GONG Ping1, LIU Haibo3, HU Jianhua3

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Abstract

Here, a new dynamic model named a double-beam system with discrete springs was proposed for an inclined tower cable-stayed bridge without backstays based on cables’ elastic support effect on bridge deck beam in a cable-stayed bridge.In the model, cables were taken as springs without masses, tower and deck were regarded as two Euler-Bernoulli beams considering influence of axial force.Then, based on the basic principle of the transfer matrix method, the fundamental theory for evaluating the vertical bending stiffness of the inclined tower cable-stayed bridge without backstays was derived.Finally, Hongshan bridge of Changsha city was taken as an example, and its natural frequencies and modes were calculated.Meanwhile, influences of ordinary steel cables replaced with CFRP ones on the vertical bending rigidity of the bridge were studied.The results showed that the proposed model can be used to effectively evaluate the vertical bending rigidity of an inclined tower cable-stayed bridge without backstays; CFRP cables can improve the bridge’s overall rigidity to some extent compared with the traditional steel ones.

Key words

cable-stayed bridge / modelling / transfer matrix method / vertical bending rigidity / CFRP

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CAI Xiangyang1, SU Xiaoyang2, KANG Houjun2, GONG Ping1, LIU Haibo3, HU Jianhua3. Evaluation model and method for vertical bending stiffness of a cable-stayed bridge without backstays[J]. Journal of Vibration and Shock, 2018, 37(19): 104-111

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