Tsunami Design Target Reliabilities


Abstract eng:
Many coastal areas in the U.S. are subject to tsunami hazard. Presently, U.S. codes do not include any consideration of tsunami hazard, and important or even hazardous material structures can be built with no planning at all for the consequences of destructive tsunamis. The public safety risk has been partially mitigated through warning and preparedness for evacuation, but community disaster resilience requires that critical and essential facilities provide structural resistance to collapse and the capacity to resume vital services. The new ASCE 7 provisions for Tsunami Loads and Effects implements a unified set of analysis and design methodologies that are consistent with probabilistic hazard analysis, tsunami physics, and reliability analysis. The intent of these requirements is to improve on both the siting and design of new Risk Category III and IV buildings and other structures built in U.S. Pacific coast communities. This will result in greater community disaster resilience. The purpose of this paper is to provide an outline of the analysis of the structural reliability basis for tsunamiresilient design of critical and essential facilities, taller building structures, and tsunami vertical evacuation refuge structures. Probabilistic limit state reliabilities are computed for representative structural components carrying gravity and tsunami loads, utilizing statistical information on the key hydrodynamic loading parameters and resistance models with specified tsunami load combination factors. Through a parametric analysis performed using Monte Carlo simulation, it is shown that anticipated reliabilities for tsunami hydrodynamic loads meet the general intent of the ASCE 7 Standard. Importance factors consistent with the target reliabilities for extraordinary loads (such as seismic events) are determined for tsunami loads. Target structural component reliabilities given that the Maximum Considered Tsunami has occurred are similar to seismic systemic performance reliabilities given that the Maximum Considered Earthquake has occurred.

Conference Title:
Conference Title:
16th World Conference on Earthquake Engineering
Conference Venue:
Santiago (CL)
Conference Dates:
2017-01-09 / 2017-01-13
Rights:
Text je chráněný podle autorského zákona č. 121/2000 Sb.



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 Record created 2017-01-18, last modified 2017-01-18


Original version of the author's contribution as presented on USB, paper 301.:
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