Recent development and implementation of direct analysis in NIDA

Y. P. Liu, Z. L. Du, J. W. He, Z. X. Ding, S. L. Chan, W. F. Chen

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

Abstract

Direct analysis method attracts increasing attention in both academic research and engineering application. This method integrates the analysis and the design together while the traditional linear design method with effective length assumption separates the design from analysis such that the analysis results cannot truly reflect the structural behavior. The aim of effective length method is trying to compensate the ignorance of second-order effects, initial imperfections and so on during the linear analysis but there exist many uncertainties in the determination of effective length factor, especially for complex spatial structures. Generally speaking, the traditional method may lead to two extreme cases, i.e. over-design and under-design. GB50017-2017 has included the second-order direct analysis method to overcome the shortcomings of the traditional method. The former requires to directly consider the factors such as initial geometrical imperfections, residual stress, material yielding and semi-rigid connections, which may significantly affect the structural behaviors, in the analysis process. The interactions of the influence factors have been reflected in the direct analysis. As a result, the conventional effective length method can be avoided and only the section capacity check is needed. This paper introduces the recent development of second-order direct analysis.

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

  • Composite structures
  • Direct analysis
  • Initial imperfection
  • Residual stress
  • Tension structures

ASJC Scopus subject areas

  • Metals and Alloys
  • Civil and Structural Engineering

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