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Elastic buckling and load resistance of a single cross-arm pre-tensioned cable stayed buckling-restrained brace
- Source :
- Engineering Structures. 126:516-530
- Publication Year :
- 2016
- Publisher :
- Elsevier BV, 2016.
-
Abstract
- This paper proposes a new type of buckling-restrained braces (BRB), namely a pre-tensioned cable stayed buckling-restrained brace (PCS-BRB) which is formed through introducing an additional structural system of pre-tensioned cables and a number of cross-arms to the outside of a common BRB. This new system significantly improves the BRB’s overall external restraining stiffness, hence increasing the load-carrying efficiency in its structural design. Due to its aesthetically appealing structure, it can be utilised in stadiums and so forth as a laterally resistant brace. Equilibrium method is utilised to deduce formulas of elastic buckling load of pin-ended PCS-BRB. The restraining ratio and the initial pre-tensioning force of cables are investigated to explore the effect on the axial compressive load-carrying capacity of the PCS-BRB through finite element analyses in elastic-plastic range. The findings indicate that two different types of buckling modes may occur in this PCS-BRB, namely single-wave symmetric and double-wave antisymmetric buckling modes. It was found from theoretical and numerical analyses that: a negative linear correlation exists between elastic buckling load and initial pre-tensioning force of the cables; the geometric parameters of the cable stayed system possessed remarkable effect on the elastic buckling load. In addition, the post-yield behaviour and ultimate compressive load-carrying capacity of the PCS-BRB is directly proportional to the restraining ratio, and there exists a lower limit of the restraining ratio which allows the inner core to reach full cross-sectional yielding without overall instability failure of the PCS-BRB. Furthermore, there exists an optimal initial pre-tensioning force of cables to make the load-carrying capacity of the PCS-BRB to reach a maximum value. The investigation of elastic buckling and load resistance of PCS-BRB provides fundamentals to further develop a complete design method of PCS-BRB.
- Subjects :
- 021110 strategic, defence & security studies
Engineering
business.industry
Antisymmetric relation
Structural system
0211 other engineering and technologies
Stiffness
020101 civil engineering
02 engineering and technology
Structural engineering
Instability
Finite element method
Brace
0201 civil engineering
Buckling
medicine
medicine.symptom
business
Load resistance
Civil and Structural Engineering
Subjects
Details
- ISSN :
- 01410296
- Volume :
- 126
- Database :
- OpenAIRE
- Journal :
- Engineering Structures
- Accession number :
- edsair.doi...........6c1dd07d1f68e5dc58db9b0112f9e711