Seismic fragility assessment of bridges with as-built and retrofitted splice-deficient columns

Abstract A significant proportion of existing bridges in high seismic regions were constructed prior to the 1970s. As a result poor reinforcement detailing, pre-1970s bridge columns are susceptible lap-splice or shear failure plastic region. Given economic impact retrofitting all reinforced concrete (RC) bridges, it is essential identify most vulnerable for retrofit prioritisation. Analytical fragility functions useful quantifying vulnerability stock. However, accuracy these relies on adequacy adopted modelling approach. This paper presents hinge-type approach capturing response as-built splice-deficient and retrofitted RC columns. Fragility analysis carried out typical seat diaphragm abutment two-span using proposed The results showed that depends column mode limit state under consideration. Also, common notion component may not necessarily be true. study underscored without other components effectively mitigate damage associated risk.