Publication:
Reliability-based optimal design software for earthquake engineering applications

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Authors
Royset, Johannes O.
Liang, Hong
Haukaas, Terje
Subjects
reliability-based design optimization
nonlinear finite elements
earthquake engineering
object-oriented software development
OpenSees
Advisors
Date of Issue
2007-08-09
Date
August 9, 2007
Publisher
NRC Canada
Language
Abstract
This paper describes a functional tool for engineers to make rational design decisions by balancing cost and safety. Focus is on seismic design, in which nonlinear structural response must be considered. For this purpose, we implement and apply a state-of-the-art algorithm for reliability-based design optimization. The work extends the OpenSees software, which is rapidly gaining users in the earthquake engineering community. Consequently, design optimization with sophisticated nonlinear finite element models of real structures is possible. An object-oriented software architecture is employed that focuses on maintainability and extensibility of the software. This approach also offers flexibility in the choice of optimization and reliability methods for each specific problem, supported by the decoupled nature of the 'optimization algorithm. Our work utilizes and extends the existing tools for structural reliability analysis in OpenSees. In particular, we employ response sensitivities that are computed within the finite element code by direct differentiation. The implementation is tested through case studies with nonlinear structural response. Discontinuous response gradients are overcome by use of fibre cross sections and smoothed material models. The numerical examples include the seismic design optimization of a six-storey, three-bay, reinforced concrete building.
Type
Article
Description
The article of record as published may be found at http://dx.doi.org/10.1139/L07-002
Series/Report No
Department
Operations Research (OR)
Organization
Naval Postgraduate School (U.S.)
Identifiers
NPS Report Number
Sponsors
Discovery Grant from the Natural Sciences and Engineering Research Council of Canada (NSERC)
LSSOL software package
Funder
Discovery Grant from the Natural Sciences and Engineering Research Council of Canada (NSERC)
Format
14 p.
Citation
Can. J. Civ. Eng. 34: 856-869 (2007)
Distribution Statement
Rights
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.
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