Seismic performance of post - fire building (case study: Pasar Wage, Banyumas)

Abstract

On September 21, 2020, the Pasar Wage Building of Kabupaten Banyumas was hit by a fire causing spalling of the concrete and thus exposing the steel reinforcement. This damage can affect the performance and safety of the building. For this reason, an evaluation is needed to determine the performance of the post-fire structure to propose the necessary repair and retrofitting. Investigation and testing in the field were carried out in this study as primary data for seismic performance analysis. Static pushover analysis was carried out to provide information about the structure's collapse performance using damage states of the FEMA P-58 criteria. The seismic performance was then presented with a fragility curve to illustrate the probability of building damage. The results show that the maximum base shear value is 3033 kN with a displacement of 0.063 m. At a target displacement of 0.027 m, the base shear is 2618 kN. The probability of structural damage within a category of extensive is 77% if an earthquake at the Design Basic Eartquake (DBE) level strike the building. The probability of structural damage becomes 50% extensive and 50% complete at the Maximum Considered Earthquake (MCE) level.