Shaking table tests for a long-span curved rigid bridge under near-fault ground motions

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Journal of Vibration and Shock ›› 2017, Vol. 36 ›› Issue (5) : 199-207.

LI Xi,JIA Hongyu,LI Qian

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Abstract

To study the effects of near-fault ground motions on a long-span curved rigid bridge,an actual curved rigid bridge based on a scale of 1/40 model was employed to conduct shaking table tests.The typical near-fault and far-field ground motions recorded under the same earthquake were selected as the ground motion input,and then comparative tests on a multi-shaking table array system were carried out.During tests,the structure was subjected to synchronous and traveling wave excitations taken as longitudinal and transverse inputs,and the combination of transverse and longitudinal inputs,respectively.The results showed that the velocity pulse contained in near-fault ground motions has a significant influence on the dynamic response of the curved rigid bridge and the structural response amplification effect can be further elevated by traveling wave effect; near-fault effect is more obvious for the structure with a larger stiffness or a certain direction of the structure,whereas the influence of traveling wave effect on the structure is dependent primarily upon higher order asymmetric modes induced by mult-point excitations; compared with a straight line bridge,both near-fault effect and traveling wave effect cause more harmful influence on the dynamic response of the curved bridge due to a larger stiffness in horizontal direction caused by curvature radius; therefore,the curved bridge may be damaged more seriously than a straight bridges may under the same earthquake in near-fault zone.It was suggested that special attentions should be received for a curved rigid bridge close to fault zones.

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near-fault ground motions / curved rigid bridge / shaking table test / dynamic response

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LI Xi,JIA Hongyu,LI Qian. Shaking table tests for a long-span curved rigid bridge under near-fault ground motions[J]. Journal of Vibration and Shock, 2017, 36(5): 199-207

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