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<p>Bridge damage induces immediate stiffness reductions in bridge structures, manifested as variations in static parameters such as strain and deflection, which pose significant safety risks. This paper presents a rapid damage diagnosis method for T-beam bridges using strain influence lines. The method derives the analytical strain influence line formula for T-beam bridges and examines its variation under transverse and longitudinal damage conditions. By analyzing peak values and envelope area shifts in the strain influence line, a diagnostic difference curve is generated, enabling the development of a qualitative damage assessment system. This system localizes damaged regions and provides transverse/longitudinal positioning and quantitative evaluation methods for T-beam bridge damage. Experimental validation using a scaled T-beam bridge model confirms the method’s applicability and feasibility for damaged-state structural assessment.</p>

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Research on damage identification in T-beam bridges based on strain influence lines

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年9月29日

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  • Nianchun Deng,
  • Wenhao Xue,
  • Zhongqing Han,
  • Tianzhi Hao,
  • Xianhui Hu,
  • Jinping Ou

摘要

Bridge damage induces immediate stiffness reductions in bridge structures, manifested as variations in static parameters such as strain and deflection, which pose significant safety risks. This paper presents a rapid damage diagnosis method for T-beam bridges using strain influence lines. The method derives the analytical strain influence line formula for T-beam bridges and examines its variation under transverse and longitudinal damage conditions. By analyzing peak values and envelope area shifts in the strain influence line, a diagnostic difference curve is generated, enabling the development of a qualitative damage assessment system. This system localizes damaged regions and provides transverse/longitudinal positioning and quantitative evaluation methods for T-beam bridge damage. Experimental validation using a scaled T-beam bridge model confirms the method’s applicability and feasibility for damaged-state structural assessment.