Cost-benefit Analysis
of Seismic Retrofitting Strategies for Residential Buildings in Surabaya, Indonesia
Aulady Mohamad F.N., Pratama Adi A., Herdiansyah Herdis and Hamidah Nur Laila
Disaster Advances; Vol. 15(9); 16-23;
doi: https://doi.org/10.25303/1509da016023; (2022)
Abstract
Surabaya has potential vulnerability to a seismic activity as it has residential
buildings with unreinforced confined masonry structures. This building structure
is vulnerable to the massive destruction during the earthquake. Retrofitting existing
unreinforced masonry structures is necessary as a mitigation strategy. However,
the lack of funding and the high cost of retrofitting adaptation have become major
obstacles. This study discussed a cost-benefit analysis of the seismic retrofitting
strategies in confined masonry buildings in Surabaya. We added practical column,
structural beams and a combination of practical column and structural beams as the
retrofitting model. The model was then compared to normal buildings for a cost-benefit
analysis.
The results demonstrated that adding practical columns could significantly reduce
the building damage by 4.75 %. The additional combination of a practical column
and structural beams shows zero damage to the building after the earthquake. The
reinforcement of structural beams represents the highest cost-benefit ratio (44.44)
due to the lowest retrofitting cost with 30.73% of damage. The costbenefit calculation
is expected to give the community remarkable information regarding the critical
value of seismic retrofitting to achieve the sustainable development.
