Optimization of semi-rigid steel frames with second-order direct analysis

Fa Wu Wang, Yao Peng Liu, Zhi Hua Zhou, Siu Lai Chan

Research output: Chapter in book / Conference proceedingConference article published in proceeding or bookAcademic researchpeer-review

Abstract

Semi-rigid steel frames are considered as more cost-effective than conventional fully rigid steel frames by using the economical partially restrained (PR) connections, which means more design flexibility and optimization potential. Advanced or direct analysis accounting the nonlinearity of material, geometrical and joints should be used to accurately capture the collapse process and bearing performance of semi-rigid steel frames under various load conditions. In this paper, an effective procedure for optimizing steel frames with semi-rigid joints using direct analysis is proposed and verified. The NIDA software with PEP element is used to capture the second-order effects and the inelastic behaviors of beam and column members, and the zero-length spring model is employed for estimating nonlinear behaviors of semi-rigid joints. Two optimization algorithm named Pointer and MIGA provided by professional optimization software ISIGHT is used and also the file filter module of OpenMDAO which is an open-source high-performance computing platform for systems analysis and multidisciplinary optimization written in Python. The cross-section of structural members are treated as discrete variables selected from prescribed groups and the semi-rigid connection types are optimized as continuous variables or discrete variables. The optimization result shows that the method is efficient and applicable to the optimization of practical engineering steel frames.

Original languageEnglish
Title of host publicationProceedings of the 9th International Conference on Advances in Steel Structures, ICASS 2018
EditorsSiu Lai Chan, Tak-Ming Chan, Songye Zhu
PublisherHong Kong Institution of Steel Construction
ISBN (Electronic)9889914093, 9789889914097
DOIs
Publication statusPublished - Dec 2018
Event9th International Conference on Advances in Steel Structures, ICASS 2018 - Hong Kong, China
Duration: 5 Dec 20187 Dec 2018

Publication series

NameProceedings of the 9th International Conference on Advances in Steel Structures, ICASS 2018

Conference

Conference9th International Conference on Advances in Steel Structures, ICASS 2018
Country/TerritoryChina
CityHong Kong
Period5/12/187/12/18

Keywords

  • OpenMDAO
  • Optimization
  • Semi-rigid joints
  • Steel frames

ASJC Scopus subject areas

  • Metals and Alloys
  • Civil and Structural Engineering

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