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| Rocking spectrum of a post-tensioned double-column rocking bridge system |
| WANG Baofu1,2, SHI Yu3, SHI Xiangfeng1, ZHANG Hongfen1 |
1.Architectural Engineering College, North China Instituteof Science and Technology, Beijing 101601,China;
2.Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education, Beijing University of Technology, Beijing 100124,China;
3.China Building Materials Academy,Beijing 100024,China |
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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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Received: 25 January 2021
Published: 28 May 2022
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