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Seismic Life-Cycle Cost-Benefit Analysis of a BRBs Retrofitted Frame
Non-ductile buildings designed without consideration of modern seismic design principles may lead to damage, incurring loss of life and property following earthquake events. Alleviation of damage due to earthquakes is accomplished utilizing structural retrofitting techniques. Among the various viable retrofit measures, the use of buckling restrained braces (BRBs) has emerged to be promising, as indicated by past researchers. These braces provide a supplemental path for the earthquake-induced lateral loads and thus enhance the seismic behavior of the frame by adding energy dissipation capacity and, in some cases, stiffness to the bare frame. Consequently, this retrofitting technique leads to reduction in seismic losses in case of a future earthquake event. A frame can be designed for various retrofit level defined as the ratio between the base shear capacity of the bracing system and the bare frame. Since the infrastructure owners and stakeholders are often restricted by economic resources; it is crucial to estimate the cost-effectiveness of different retrofit level in terms of economic metrics by considering various sources of uncertainties into consideration. A benchmark two-dimensional reinforced concrete frame with low ductility capacity is considered as a case study. The gravity load designed frame is retrofitted with BRBs for different retrofit level. The cost effectiveness of various retrofit level is conducted by a probabilistic approach where record-to-record variability of ground motions and BRB parameter uncertainty is considered to first develop seismic fragility curves of retrofitted frame for different retrofit level. Next, the fragility curves are used in conjunction with regional hazard information and repair costs data to evaluate the seismic life-cycle cost estimates of the retrofitted frame for various retrofit level. The study identifies the most viable retrofit level that result in minimum seismic life-cycle cost and consequently highest benefits in terms of retrofit implementation. The ...
Seismic Life-Cycle Cost-Benefit Analysis of a BRBs Retrofitted Frame
Non-ductile buildings designed without consideration of modern seismic design principles may lead to damage, incurring loss of life and property following earthquake events. Alleviation of damage due to earthquakes is accomplished utilizing structural retrofitting techniques. Among the various viable retrofit measures, the use of buckling restrained braces (BRBs) has emerged to be promising, as indicated by past researchers. These braces provide a supplemental path for the earthquake-induced lateral loads and thus enhance the seismic behavior of the frame by adding energy dissipation capacity and, in some cases, stiffness to the bare frame. Consequently, this retrofitting technique leads to reduction in seismic losses in case of a future earthquake event. A frame can be designed for various retrofit level defined as the ratio between the base shear capacity of the bracing system and the bare frame. Since the infrastructure owners and stakeholders are often restricted by economic resources; it is crucial to estimate the cost-effectiveness of different retrofit level in terms of economic metrics by considering various sources of uncertainties into consideration. A benchmark two-dimensional reinforced concrete frame with low ductility capacity is considered as a case study. The gravity load designed frame is retrofitted with BRBs for different retrofit level. The cost effectiveness of various retrofit level is conducted by a probabilistic approach where record-to-record variability of ground motions and BRB parameter uncertainty is considered to first develop seismic fragility curves of retrofitted frame for different retrofit level. Next, the fragility curves are used in conjunction with regional hazard information and repair costs data to evaluate the seismic life-cycle cost estimates of the retrofitted frame for various retrofit level. The study identifies the most viable retrofit level that result in minimum seismic life-cycle cost and consequently highest benefits in terms of retrofit implementation. The ...
Seismic Life-Cycle Cost-Benefit Analysis of a BRBs Retrofitted Frame
Freddi, F (author) / Ghosh, J (author) / Raghunandan, M (author) / Kotoky, N (author)
2020-09-18
In: Proceedings of the 17th World Conference on Earthquake Engineering (17WCEE). World Conference on Earthquake Engineering (WCEE): Sendai, Japan. (2020)
Paper
Electronic Resource
English
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