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<p>Steel structures that survive a fire without collapse are assessed for their residual load-bearing capacity, which becomes imperative for determining their post-fire serviceability. Concurrently, high-strength steels, particularly S690, have been increasingly adopted in modern bridge construction worldwide, exemplified by structures such as the Mttådalen Bridge in Sweden. This study presents the first systematic numerical investigation of the post-fire patch-loading behavior of high-strength S690 CWGs. Unlike previous studies primarily focused on flat-web girders or ambient-temperature response, the present work quantitatively evaluates the influence of trapezoidal web corrugation on the residual stiffness, strength degradation, instability evolution, and patch loading resistance of CWGs after fire exposure. The study further examines the applicability of existing patch-loading design formulations at elevated temperatures. It proposes a practical, design-oriented assessment approach by incorporating temperature-dependent residual material degradation into the Elgaaly-Seshadri model. The findings provide new quantitative insights into the post-fire structural response of CWGs and establish a basis for future fire-resistant design and for the assessment of residual strength in CWG bridges. Post-fire material degradation was incorporated using reduced mechanical properties of S690 steel reported in the literature. Temperature-dependent material models were used to numerically investigate the post-fire behavior of the CWGs. Since no experimental post-fire tests were available for validation, the presented post-fire responses should be interpreted as numerical predictions based on adopted constitutive relationships. The developed FE model was validated at ambient temperature against available experimental results, and the corresponding FE predictions were further benchmarked against existing design models for patch-loading resistance to evaluate their accuracy and conservatism under room-temperature conditions. Results reveal the critical role of web geometry in post-fire stiffness, strength, and stability, providing quantitative insights for improving predictive models.</p>

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Numerical Analysis and Design for Residual Patch-Loading Resistance of S690 HSS Corrugated Web I-Girders Subjected to Elevated Temperatures

  • 期刊论文

  • 发表日期：

    2026年7月18日

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  • Showkat Ahmad Kumar,
  • Javed Ahmad Bhat,
  • Fayaz Ahmad Sofi,
  • G. A. Harmain

摘要

Steel structures that survive a fire without collapse are assessed for their residual load-bearing capacity, which becomes imperative for determining their post-fire serviceability. Concurrently, high-strength steels, particularly S690, have been increasingly adopted in modern bridge construction worldwide, exemplified by structures such as the Mttådalen Bridge in Sweden. This study presents the first systematic numerical investigation of the post-fire patch-loading behavior of high-strength S690 CWGs. Unlike previous studies primarily focused on flat-web girders or ambient-temperature response, the present work quantitatively evaluates the influence of trapezoidal web corrugation on the residual stiffness, strength degradation, instability evolution, and patch loading resistance of CWGs after fire exposure. The study further examines the applicability of existing patch-loading design formulations at elevated temperatures. It proposes a practical, design-oriented assessment approach by incorporating temperature-dependent residual material degradation into the Elgaaly-Seshadri model. The findings provide new quantitative insights into the post-fire structural response of CWGs and establish a basis for future fire-resistant design and for the assessment of residual strength in CWG bridges. Post-fire material degradation was incorporated using reduced mechanical properties of S690 steel reported in the literature. Temperature-dependent material models were used to numerically investigate the post-fire behavior of the CWGs. Since no experimental post-fire tests were available for validation, the presented post-fire responses should be interpreted as numerical predictions based on adopted constitutive relationships. The developed FE model was validated at ambient temperature against available experimental results, and the corresponding FE predictions were further benchmarked against existing design models for patch-loading resistance to evaluate their accuracy and conservatism under room-temperature conditions. Results reveal the critical role of web geometry in post-fire stiffness, strength, and stability, providing quantitative insights for improving predictive models.