NDLI: State-of-the-Art Techniques for Seismic Soil-Structure Interaction Analysis of Steel Gravity Structures

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Tajirian, Frederick Tabatabaie, Mansour Sumodobila, Basilio Paulson, Stephen Davies, Bill
Copyright Year	2014
Abstract	The design of steel jacket fixed offshore structures in zones of moderate seismicity is typically governed by Metocean loads. In contrast the steel gravity structure (SGS) presented in this paper, is a heavy and stiff structure. The large mass results in foundation forces from seismic events that may exceed those created by extreme cyclonic storm events. When computing the earthquake response of such structures it is essential to account for soil-structure interaction (SSI) effects. Seismic SSI analysis of the SGS platform was performed using state-of-the-art SSI software, which analyzed a detailed three-dimensional model of the SGS supported on layered soil system. The results of this analysis were then compared with those using industry standard impedance methods whereby the layered soil is replaced by equivalent foundation springs (K) and damping (C). Differences in calculated results resulting from the different ways by which K and C are implemented in different software are presented. The base shear, overturning moment, critical member forces and maximum accelerations were compared for each of the analysis methods. SSI resulted in significant reduction in seismic demands. While it was possible to get reasonable alignment using the different standard industry analysis methods, this was only possible after calibrating the KC foundation model with software that rigorously implements SSI effects. Lessons learned and recommendations for the various methods of analysis are summarized in the paper.
Sponsorship	Ocean, Offshore and Arctic Engineering Division
File Format	PDF
ISBN	9780791845431
DOI	10.1115/OMAE2014-24712
Volume Number	Volume 4B: Structures, Safety and Reliability
Conference Proceedings	ASME 2014 33rd International Conference on Ocean, Offshore and Arctic Engineering
Language	English
Publisher Date	2014-06-08
Publisher Place	San Francisco, California, USA
Access Restriction	Subscribed
Subject Keyword	Damping Gravity (force) Computer software Three-dimensional models Offshore structures Steel Stress Design Storms Earthquakes Soil Engineering standards Shear (mechanics) Springs
Content Type	Text
Resource Type	Article

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