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<p>Seismic performance assessment of long-span reinforced concrete (RC) arch bridges is essential due to their complex dynamic behavior and critical role in infrastructure networks. Traditional assessment approaches often rely on simplified modeling and limited ground motion datasets, which do not fully capture the response of a bridge under diverse seismic scenarios. The study deals with an extensive seismic evaluation of a long-span deck-type RC arch bridge to investigate its dynamic behavior under seismic loading. A three-dimensional finite element (3D-FE) model was developed using the midas Civil 2023 (v1.1) platform, and modal analysis was done to identify the predominant mode shapes and period. From a database of 100 ground motion records, 16 records (eight near-field and eight far-field) were selected through regression analysis based on peak ground acceleration and other intensity measures. Nonlinear seismic analyses revealed that near-field ground motions, particularly those exhibiting fling step effects, induced greater structural demands than forward directivity and far-field ground motions. Substantial responses were observed in terms of peak displacements, peak accelerations, internal force variations of the arch, and Demand-to-Capacity values of spandrel columns. Although near-field motions generally produced higher seismic demands, the spectral acceleration at the fundamental period of the structure affected the base shear responses. Additionally, this study highlights the vulnerability of short spandrel columns, recommending retrofitting measures to augment the bridge’s seismic resilience.</p>

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Seismic response analysis of a long-span RC arch bridge under near-field and far-field ground motions

  • 期刊论文

  • 发表日期：

    2025年11月18日

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  • Meera Jacob,
  • Deepa Balakrishnan Santhamma

摘要

Seismic performance assessment of long-span reinforced concrete (RC) arch bridges is essential due to their complex dynamic behavior and critical role in infrastructure networks. Traditional assessment approaches often rely on simplified modeling and limited ground motion datasets, which do not fully capture the response of a bridge under diverse seismic scenarios. The study deals with an extensive seismic evaluation of a long-span deck-type RC arch bridge to investigate its dynamic behavior under seismic loading. A three-dimensional finite element (3D-FE) model was developed using the midas Civil 2023 (v1.1) platform, and modal analysis was done to identify the predominant mode shapes and period. From a database of 100 ground motion records, 16 records (eight near-field and eight far-field) were selected through regression analysis based on peak ground acceleration and other intensity measures. Nonlinear seismic analyses revealed that near-field ground motions, particularly those exhibiting fling step effects, induced greater structural demands than forward directivity and far-field ground motions. Substantial responses were observed in terms of peak displacements, peak accelerations, internal force variations of the arch, and Demand-to-Capacity values of spandrel columns. Although near-field motions generally produced higher seismic demands, the spectral acceleration at the fundamental period of the structure affected the base shear responses. Additionally, this study highlights the vulnerability of short spandrel columns, recommending retrofitting measures to augment the bridge’s seismic resilience.