Abstract
The 2010 edition of the load standard in the United States (U.S.), ASCE 7-10, (Minimum Design Loads for Buildings and Other Structures) introduced risk-targeted spectral acceleration values for the estimation of seismic design loads. In this study, a 20-story steel moment resisting frame structure located in Century City, CA, USA was designed based on ASCE 7-10 and a probabilistic seismic collapse assessment was conducted. The main goals of this study are: (a) to evaluate whether the design of a typical steel moment-frame structure based on risk-targeted spectral accelerations fulfills the target design collapse level of 1% probability of collapse in 50 years; and (b) to quantify the collapse potential of a tall steel structure design based on the most current U.S. seismic code provisions. The probability of collapse was estimated for two sets of 104 and 224 recorded ground motions, respectively. An evaluation of the results demonstrated that for this specific structure the code-prescribed collapse performance target was reasonably met.
Highlights
Most earthquake-induced casualties are the direct result of structural collapses
The main goal of this study is to evaluate whether the design of a typical steel moment-frame structure based on risk-targeted spectral accelerations fulfills the target design collapse risk level of 1% probability of collapse in 50 years for a location in Century City, CA, USA
For the majority of building structures, these spectral accelerations correspond to 1% probability of collapse in 50 years and are different from the hazard-based design values used in previous editions of ASCE 7
Summary
Most earthquake-induced casualties are the direct result of structural collapses. Structural collapse implies that the structural system is unable to withstand its own gravity loads. Seismic code criteria for structural systems in the United States (U.S.) focus primarily on performance targets related to collapse prevention and life safety. These performance targets are associated with mapped 5%-damped pseudo-spectral acceleration (Sa) values that are used as the basis for design. Challenges associated with our ability to reliably estimate and predict building collapse have driven numerous studies to better evaluate and mitigate the collapse potential of buildings [1,2,3,4,5,6,7,8,9,10,11,12,13] Seismic criteria documents such as ASCE 7
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