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The development of the seismic fragility curves of existing bridges in Indonesia (Case study: DKI Jakarta)

  • Veby Citra Simanjuntak (Structural Engineering Research Group, Faculty of Civil and Environmental Engineering, Bandung Institute of Technology) ;
  • Iswandi Imran (Structural Engineering Research Group, Faculty of Civil and Environmental Engineering, Bandung Institute of Technology) ;
  • Muslinang Moestopo (Structural Engineering Research Group, Faculty of Civil and Environmental Engineering, Bandung Institute of Technology) ;
  • Herlien D. Setio (Structural Engineering Research Group, Faculty of Civil and Environmental Engineering, Bandung Institute of Technology)
  • Received : 2023.02.14
  • Accepted : 2023.04.03
  • Published : 2023.03.25
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Abstract

Seismic regulations have been updated from time to time to accommodate an increase in seismic hazards. Comparison of seismic fragility of the existing bridges in Indonesia from different historical periods since the era before 1990 will be the basis for seismic assessment of the bridge stock in Indonesia, most of which are located in earthquake-prone areas, especially those built many years ago with outdated regulations. In this study, seismic fragility curves were developed using incremental non-linear time history analysis and more holistically according to the actual strength of concrete and steel material in Indonesia to determine the uncertainty factor of structural capacity, βc. From the research that has been carried out, based on the current seismic load in SNI 2833:2016/Seismic Map 2017 (7% probability of exceedance in 75 years), the performance level of the bridge in the era before SNI 2833:2016 was Operational-Life Safety whereas the performance level of the bridge designed with SNI 2833:2016 was Elastic - Operational. The potential for more severe damage occurs in greater earthquake intensity. Collapse condition occurs at As = FPGA x PGA value of bridge Era I = 0.93 g; Era II = 1.03 g; Era III = 1.22 g; Era IV = 1.54 g. Furthermore, the fragility analysis was also developed with geometric variations in the same bridge class to see the effect of these variations on the fragility, which is the basis for making bridge risk maps in Indonesia.

Keywords

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