Seismic vulnerability assessment of concrete-filled steel built-up column building

To check the effect of earthquake in composite material as concrete filled steel box (CFSB) column; mainly three combinations of the column-beam (Pre-existing RCC building, CFSB column-steel beam and CFSB column-RC beam) structure is compared. Using response spectrum analysis in numerical FE software, the seismic effect was examined for all three combinations. It is determined that the CFSB column-steel beam combination is appropriate for high seismic effect. The RCC building and the CFSB column-steel beam building have also undergone seismic fragility analyses. For seismic-resistant constructions, lateral load carrying capability and collapse prevention are improved when the time history and fundamental time period of response spectra match. The CFSB structures have a three-fold greater peak ground acceleration (PGA) tolerance than RCC buildings in an Incremental dynamic analysis (IDA) comparison, with the difference in damage propagation during operational (OP) phases being negligible. Therefore, it is determined that the building having CFSB column-steel beam combination is safe in comparison.