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Design of multiple cross-arm PCS-BRBs considering asymmetric imperfection and initial pre-tensioning force
- Source :
- Journal of Constructional Steel Research. 153:431-448
- Publication Year :
- 2019
- Publisher :
- Elsevier BV, 2019.
-
Abstract
- Multiple cross-arm Pre-tensioned Cable Stayed Buckling-Restrained Braces (MPCS-BRBs) can significantly enhance the elastic buckling performance and load resistance over common double-tube BRBs because of the additional cable stayed system. Previous studies conducted by the authors intended to investigate the lower limits of restraining ratios of MPCS-BRBs with pin-ended stays subjected to either monotonic or cyclic axial loads, where the initial geometric imperfection was taken to be consistent with the first order buckling mode. This study is a continuation of the previous paper, and it aims to explore interactive buckling of MPCS-BRBs with pin-ended stays in order to obtain a safe estimate of their load-carrying capacities through nonlinear Finite Element Analysis (FEA). In addition, interactive buckling of MPCS-BRBs is considered by introducing a series of asymmetric imperfections that are the mixtures of symmetric and antisymmetric imperfections during buckling analysis. The effects of different imperfections (symmetric, antisymmetric, and asymmetric) and initial pre-tensioning force of cables on the load-carrying capacities of the MPCS-BRBs with and without minor diagonal cables are explored and compared. Furthermore, a conservative design approach for those MPCS-BRBs can be established by fulfilling the corresponding lower limits of restraining ratios and optimal initial pre-tensioning force of cables based on the findings considering different types of initial geometric imperfections. Finally, such a conservative design approach is validated through nonlinear FEA for MPCS-BRBs subjected to either monotonic or cyclic axial loads. The findings in this study could provide guidance for a preliminary conservative design of the MPCS-BRBs in actual engineering applications.
- Subjects :
- Series (mathematics)
business.industry
Antisymmetric relation
Diagonal
Metals and Alloys
Mode (statistics)
Monotonic function
Building and Construction
Structural engineering
Finite element method
Continuation
Buckling
Mechanics of Materials
business
Civil and Structural Engineering
Mathematics
Subjects
Details
- ISSN :
- 0143974X
- Volume :
- 153
- Database :
- OpenAIRE
- Journal :
- Journal of Constructional Steel Research
- Accession number :
- edsair.doi...........319b447c18e4b1d7e11bd15db53a5ed0