Rocking spectrum of a post-tensioned double-column rocking bridge system

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Journal of Vibration and Shock ›› 2022, Vol. 41 ›› Issue (10) : 270-277.

WANG Baofu1,2, SHI Yu3, SHI Xiangfeng1, ZHANG Hongfen1

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Abstract

Rocking bridge piers can exhibit minor damage and residual displacements, displaying superior post-earthquake performance. This paper investigates the rocking response of double-column rocking bridge system which is enhanced with elastic prestressed central tendons. Following Lagrange equation and momentum conservation law, a dynamic analytical model is derived where the effect of the prestressing force of the tendons are considered. The analytical model is used to construct rocking spectrum of post-tensioned double-column rocking bridge system under pulse-type ground motions. The results show that the post-tensioned tendons are effective in reducing the response of double-column rocking bridge with small columns when subjected to long period excitations. With the increase of the size of the column or the frequency of the excitation, the influence of the tendons on the rocking response becomes marginal, whereas the bridge pier mainly depend on the rotational inertia of their columns to resist the earthquake action. Rocking bridge system with negative stiffness, which can effectively avoid the collapse of the pier without inducing local damage at the pivoting points, can be used in seismic design of double-column rocking bridge system.

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post-tensioned tendons / rocking system / double-column pier / analytical model ;rocking spectrum

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WANG Baofu1,2, SHI Yu3, SHI Xiangfeng1, ZHANG Hongfen1. Rocking spectrum of a post-tensioned double-column rocking bridge system[J]. Journal of Vibration and Shock, 2022, 41(10): 270-277

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