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<p>Suspension bridges are optimal for constructing long-span bridges due to their seismic resistance, extensive span capability, minimal foundation excavation requirements, and absence of elevated piers. The vibrational frequencies of the bridge system influence the number of simulated modes,improving bridge design by accurately calibrating eigenfrequencies via mass and stiffness distribution, thereby averting resonance and maintaining structural integrity. It is essential to examine the modal features of multi-span suspension bridges before performing a dynamic analysis of the bridge’s structure, which is crucial. The primary objective of the present research is to develop a computational representation of a multi-span bridge suspended system and analyze how different parameters affect its modal characteristics, namely its inherent frequencies and associated mode configurations. This investigation adopts the 3D FEMto investigate the modal analysis of a multi-span suspension bridge system. It centres on an orthotropic steel box deck integrated with a bridge system. This will enhance the bridge system’s design by accurately modifying the eigenfrequencies through the distribution of mass and stiffness, so preventing resonance and maintaining structural integrity. This finite element model discretizes the orthotropic steel box deck, including stiffeners and pylons, along with the concrete layer utilising Solid186 components, and employs Beam 188 elements for the cable and suspenders. The comparison with earlier research findings confirmed the model’s reliability. The analysis of this study’s cumulative mass participation factor indicates that the bridge system accounts for roughly 90 per cent of the entire mass within the very first 10 patterns of mode. The eigenfrequency value increased with higher modes exhibiting complicated deformation patterns, including symmetric and anti-symmetric lateral sway of cables. Furthermore, it can establish a foundation for further dynamic and fatigue analyses of the bridge structure concerning various dynamic loads.</p>

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Evaluation of modal performance in a multi-span suspension bridge implementing a finite element approach

  • 期刊论文

  • 发表日期：

    2025年3月13日

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  • Surbhi Aswal,
  • K. Nallasivam

摘要

Suspension bridges are optimal for constructing long-span bridges due to their seismic resistance, extensive span capability, minimal foundation excavation requirements, and absence of elevated piers. The vibrational frequencies of the bridge system influence the number of simulated modes,improving bridge design by accurately calibrating eigenfrequencies via mass and stiffness distribution, thereby averting resonance and maintaining structural integrity. It is essential to examine the modal features of multi-span suspension bridges before performing a dynamic analysis of the bridge’s structure, which is crucial. The primary objective of the present research is to develop a computational representation of a multi-span bridge suspended system and analyze how different parameters affect its modal characteristics, namely its inherent frequencies and associated mode configurations. This investigation adopts the 3D FEMto investigate the modal analysis of a multi-span suspension bridge system. It centres on an orthotropic steel box deck integrated with a bridge system. This will enhance the bridge system’s design by accurately modifying the eigenfrequencies through the distribution of mass and stiffness, so preventing resonance and maintaining structural integrity. This finite element model discretizes the orthotropic steel box deck, including stiffeners and pylons, along with the concrete layer utilising Solid186 components, and employs Beam 188 elements for the cable and suspenders. The comparison with earlier research findings confirmed the model’s reliability. The analysis of this study’s cumulative mass participation factor indicates that the bridge system accounts for roughly 90 per cent of the entire mass within the very first 10 patterns of mode. The eigenfrequency value increased with higher modes exhibiting complicated deformation patterns, including symmetric and anti-symmetric lateral sway of cables. Furthermore, it can establish a foundation for further dynamic and fatigue analyses of the bridge structure concerning various dynamic loads.