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Optimization of the Ground Motion Intensity Measure for Long-Span Suspension Bridges Considering the Impulse Effect

Junda Su, Qinghui Lai, Jinjun Hu, Longjun Xu, Lili Xie, Yulin Zou

Abstract


To study the intrinsic relationship between the structural response of long-span suspension bridges and the intensity measures (IMs) and to select the optimal IM to reduce the discreteness in the prediction of structural responses, this paper uses the Incremental Dynamic Analysis (IDA) method to amplitude adjust near-fault pulse-like ground motions and analyzes the response using the curvature at the base of the tower as the structural response index. Then uses the four evaluation indices: efficiency, sufficiency, practicality, and proficiency to evaluate the intrinsic relationship between the structural response and the IMs. The study results indicate that, according to the four evaluation indices, the velocity-related IMs all performed well, while those displacement-related IMs performed the worst. Among them, the effective peak velocity (EPV) performed the best, being optimal in all evaluation indices except for the sufficiency relative to magnitude, which was lower than the maximum incremental velocity (MIV). Therefore, the EPV can be considered the best ground motion IM for predicting the dynamic response of long-span suspension bridges under the action of near-fault pulse-like ground motion. This result can provide a basis for the selection of IMs and structural response prediction for near-fault long-span suspension bridges, considering the impulse effect.

 

Doi: 10.28991/HIJ-2025-06-01-07

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Keywords


Intensity Measure; Suspension Bridge Response; Pulse-Like Ground Motion; Evaluation Index.

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Full Text: PDF

DOI: 10.28991/HIJ-2025-06-01-07

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