Abstract
Seismic hazard levels lower than those for design of new buildings have been permitted for seismic evaluation and retrofit of existing buildings due to the relatively short remaining lifespans. The seismic hazard reduction enables cost-effective seismic evaluation and retrofit of existing buildings with limited structural capacity. The current study proposes seismic hazard reduction factors for Korea, one of low to moderate seismicity regions. The seismic hazard reduction factors are based on equal probabilities of non-exceedance within different remaining building lifespans. A validation procedure is proposed to investigate equality of seismic risk in terms of ductility-based limit states using seismic fragility assessment of nonlinear SDOF systems, of which retrofit demands are determined by the displacement coefficient method of ASCE 41-13 for different target remaining building lifespans and corresponding reduced design earthquakes. Validation result shows that the use of seismic hazard reduction factors can be permitted in conjunction with appropriate lower bounds of the remaining building lifespans.
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This work was supported by the Incheon National University Research Grant in 2015.
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Park, JH. Seismic hazard level reduction for existing buildings considering remaining building lifespans. Earthq. Eng. Eng. Vib. 18, 649–661 (2019). https://doi.org/10.1007/s11803-019-0527-4
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DOI: https://doi.org/10.1007/s11803-019-0527-4