PSI - Issue 70

Surabhi Saxena et al. / Procedia Structural Integrity 70 (2025) 169–174

173

indicate the susceptibility of damage at the given intensity level or ground motion. It helps to understand the seismic behaviour of the structure. The retrofitting decision depends on the seismic fragility assessment of the structure.

Fragility curves

Slight

Moderate

Extensive

Complete

0 0.2 0.4 0.6 0.8 1 1.2

Probability

0

0.5

1

1.5

2

2.5

Sa (g)

Fig. 4. Fragility curve at different damage states

6. Conclusion In the present study, pushover analysis is performed to gauge the response of the bridge structure. The performance point for DBE loading is observed. At MCE loading, the capacity of the structure is less as compared to the demand associated. This means at MCE, the structure may fail. The probability of damage states at specified intensity level is calculated as per Hazus manual. The non-linear static analysis is preferred for less time consumption, but to understand more accurate behaviour, dynamic study such as time history analysis and dynamic incremental analysis should be done. Fragility Analysis enables performance based seismic assessment by addressing both seismic demand and structural capacity variability. The findings of fragility analysis guides towards decision making, mitigation of seismic risks, and ranking of significant infrastructures in seismically active areas. References Banda, S. C., & Kumar, G. R. (2022). Seismic evaluation of RC bridge pier using analytical fragility curves. Innovative Infrastructure Solutions, 7(4), 276. Cao, Y., Liang, Y., Huai, C., Yang, J., & Mao, R. (2020). Seismic Fragility Analysis of Multispan Continuous Girder Bridges with Varying Pier Heights considering Their Bond‐Slip Behavior. Advances in Civil Engineering, 2020(1). Choi, E., & Jeon, J. - C. (2003). Seismic fragility of typical bridges in moderate seismic zone. KSCE Journal of Civil Engineering, 7(1), 41 – 51. Karim, K. R., & Yamazaki, F. (2003). A simplified method of constructing fragility curves for highway bridges. Earthquake Eng ineering & Structural Dynamics, 32(10), 1603 – 1626. Kim, T.-H. (2022). Seismic Performance Assessment of Deteriorated Two-Span Reinforced Concrete Bridges. International Journal of Concrete Structures and Materials, 16(1), 4. Liu, X., Zhong, J., Xi, B., & Wang, J. (2023). Seismic Fragility Analysis of Unbonded Prestressed Reinforced Concrete Bridge Column considering Residual Displacement. Journal of Earthquake Engineering, 27(3), 679 –700. Muntasir Billah, A. H. M., & Shahria Alam, M. (2015). Seismic fragility assessment of highway bridges: a state -of-the-art review. Structure and Infrastructure Engineering, 11(6), 804 – 832. Perdomo, C., Monteiro, R., & Sucuoğlu, H. (2022). Development of Fragility Curves for Single -Column RC Italian Bridges Using Nonlinear Static Analysis. Journal of Earthquake Engineering, 26(5), 2328 –2352. Thakkar, K., Rana, A., & Goyal, H. (2023). Fragility analysis of bridge structures: a global perspective & critical review of past & present trends. Advances in Bridge Engineering, 4(1), 10.