Seismic Hazard Inputs To Risk Evaluations and Real-Time Monitoring for Resilient Global Building Portfolios

Abstract eng:
Seismic evaluations on global portfolios are carried out to inform life safety and economic risk mitigation actions as well as increase business continuity and resilience. The current practice is to apply one of a number of seismic evaluations methods developed in the U.S. (e.g. ASCE 41-13 or FEMA P-154). These methods are based on the current U.S. seismic design code (ASCE 7) and seismic hazard input as short period and 1-second spectral acceleration for risk-targeted maximum considered earthquake (MCE R ) ground motions corresponding to a 1% probability of collapse in 50-years. These seismic hazard input parameters are different than currently supplied by national seismic hazard mapping in many countries. Converting the available local reference ground motion to be compatible with the U.S. methodologies with rigor and certainty is import in evaluation of seismic risk across global portfolios. This paper presents a methodology to derive seismic hazard input and guidance on estimating site class for the seismic risk evaluations based on ASCE 7 for countries outside of the US. The methodology presented has been developed through results of global portfolio assessments drawing on ~500 sites in ~50 countries on 6 continents. While global mapping products based on SRTM can approximate the site class (Vs30), they are generally inferior to traditional geologic interpretation based on a number of readily available mapping products common for major cities. Assigning an incorrect site class will create inconsistencies in scoring across the portfolio and potentially ignores the increased risk for soft soil sites. A comparison of 200 sites where site class is derived by both SRTM Vs30 and desk study geologic interpretation is presented to highlight the advantage of the desk study. Recognizing that a component of business continuity and resilience is not only understanding risk, but the ability to react rapidly after an earthquake, the findings of the seismic evaluations are put into practice through a real-time seismic risk monitoring and alert system to provide immediate situational awareness of the portfolio following the earthquake. An example of the real-time alerts, advice and actions for a portfolio of 40 buildings from the Taiwan 6 February 2016 M6.4 earthquake is presented.

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