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<p>Utilizing energy methods in analysis and design of structures against earthquake has gained popularity nowadays. In the current study, fragility curve of a truss bridge located in Iran and retrofitted for oil pipeline crossing is calculated and presented with the use of energy method. The other goal of this study is to propose energy modification coefficient (Υ) applicable for bridges and modifying buildings ductility factor (R<sub>µ</sub>) for applying in truss bridges. In addition, the design ductility for Life Safety (LS) and Collapse Prevention (CP) performance levels of truss bridges is presented. The bridge in 2 conditions including initial and retrofitted states is modelled with the use of finite element method in Perform 3D software and then analyzed with the aid of Incremental Dynamic Analysis (IDA) method. IDA and fragility curves of the conventional method and the proposed method based on energy for the original and retrofitted bridges are presented and compared. The results illustrate that the proposed energy approach can be considered as an efficient method to assess the fragility of bridges. According to the proposed method, the 50% exceedance probability in the original bridge is elastic, life safety (LS) and Collapse prevention (CP) levels have occurred at PGA = 0.2&#xa0;g, 1.1&#xa0;g and 1.9&#xa0;g, respectively, while these values are equal to 0.2&#xa0;g, 1&#xa0;g, and 1.7&#xa0;g in the retrofitted bridge.</p>

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An energy-based method for calculating the fragility curve of bridges: a case study

  • 期刊论文

  • 发表日期：

    2025年3月18日

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  • Farhad Hosseinlou,
  • Majid Moradi,
  • Meysam Sadrianzade,
  • Pedram Jalali

摘要

Utilizing energy methods in analysis and design of structures against earthquake has gained popularity nowadays. In the current study, fragility curve of a truss bridge located in Iran and retrofitted for oil pipeline crossing is calculated and presented with the use of energy method. The other goal of this study is to propose energy modification coefficient (Υ) applicable for bridges and modifying buildings ductility factor (Rµ) for applying in truss bridges. In addition, the design ductility for Life Safety (LS) and Collapse Prevention (CP) performance levels of truss bridges is presented. The bridge in 2 conditions including initial and retrofitted states is modelled with the use of finite element method in Perform 3D software and then analyzed with the aid of Incremental Dynamic Analysis (IDA) method. IDA and fragility curves of the conventional method and the proposed method based on energy for the original and retrofitted bridges are presented and compared. The results illustrate that the proposed energy approach can be considered as an efficient method to assess the fragility of bridges. According to the proposed method, the 50% exceedance probability in the original bridge is elastic, life safety (LS) and Collapse prevention (CP) levels have occurred at PGA = 0.2 g, 1.1 g and 1.9 g, respectively, while these values are equal to 0.2 g, 1 g, and 1.7 g in the retrofitted bridge.