Structural Optimization

Introduction

This study focuses on the extension of Open System for Earthquake Engineering Simulation (OpenSees, an existing software framework for nonlinear FE analysis) using Sparse Nonlinear Optimization (SNOPT, a state-of-the-art numerical optimization software). The extended OpenSees-SNOPT framework is general and flexible and can be used to solve a wide range of FE-based optimization problems in structural and geotechnical engineering. It has several distinguishing features: (1) advanced capabilities in solving optimization problems involving complex structural/geotechnical engineering systems; (2) versatility in modeling a very wide range of structural and/or geotechnical systems; (3) computational efficiency; (4) flexibility to easily accommodate and benefit from new developments in FE structural modeling and analysis, computational optimization, and probabilistic modeling and analysis; and (5) capabilities of exploring new optimization-based problems and solution methods. The use of this coupled framework is illustrated through three representative application examples, i.e., a FE reliability analysis of a reinforced concrete frame, a FE structural optimization problem of an electrical transmission steel tower, and a FE model updating the problem of a geotechnical system.

 

Related Publications

  • Gu Q, Conte JP, Barbato M, Gill PE, and McKenna F (2012). “OpenSees-SNOPT: Framework for finite element-based optimization.” Presentation, OpenSees Day 2012, August 15-16, UC Berkeley, Berkeley, CA (USA).
  • Gu Q, Barbato M, Conte JP, Gill P and McKenna F (2012). “OpenSees-SNOPT framework for finite element-based optimization.” Journal of Structural Engineering (ASCE), 138(6):822-834. (Link)

 

Funded Projects Supporting this Research

  • A probabilistic Performance-Based Approach for Wind-Borne Debris Hazard Mitigation

PI: Barbato, M.

Co-PI: None

Sponsor: LSU College of Engineering, through Longwell’s Family Foundation

Program: Fund for Innovation in Engineering Research (FIER)

Period: March 2008 - May 2010

  • A probabilistic performance-based approach for building separation distance decision to mitigate seismic pounding risk

PI: Barbato, M.

Co-PI: None

Sponsor: LSU Council on Research

Program: 2009-2010 Faculty Research Grant Program

Period: August 2010 - July 2011

  • Development of finite elements for response and response sensitivity analysis of reinforced concrete structures retrofitted with externally-bonded fiber reinforced polymers

PI: Barbato, M.

Co-PI: None

Sponsor: Louisiana Board of Regents

Program: RCS Program

Period: August 2010 - July 2013