Probabilistic Evaluation of 2015 NEHRP Soil-Structure Interaction Provisions
Publication: Journal of Engineering Mechanics
Volume 143, Issue 9
Abstract
This paper reveals the consequences of practicing the 2015 National Earthquake Hazards Reduction Program (NEHRP) soil-structure interaction (SSI) provisions, which form the basis of the 2016 edition of the seismic design standard provided by the ASCE. For this purpose, the probability that the practice of SSI provisions, in lieu of fixed-base provisions, increases the ductility demand of the structure computed. It is subsequently investigated whether the NEHRP provisions are indeed an improvement upon the SSI provisions of the current ASCE seismic design standard. To this end, 720 soil-structure systems with different numbers of stories, structural systems, aspect ratios, and foundation embedment ratios on various site classes are studied. A probabilistic framework is employed to account for prevailing uncertainties in ground motion and in the properties of the soil-structure system. It is concluded that both NEHRP and the current provisions result in unsafe designs for structures with surface foundation on moderately soft soils, but NEHRP slightly improves upon the current provisions for squat structures. For structures on very soft soils, both provisions yield conservative designs where NEHRP is even more conservative. Finally, both provisions yield near-optimal designs for other systems.
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Acknowledgments
The financial support from Sharif University of Technology through Grant Numbers G930929 and G930930 is gratefully acknowledged.
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Published In
Journal of Engineering Mechanics
Volume 143 • Issue 9 • September 2017
Copyright
©2017 American Society of Civil Engineers.
History
Received: Apr 23, 2016
Accepted: Jan 30, 2017
Published online: Apr 26, 2017
Published in print: Sep 1, 2017
Discussion open until: Sep 26, 2017
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