Fiber-based model for rectangular/square concrete-filled steel tubular columns under arbitrary end moment ratios considering member imperfection
- Release time:2024-10-24
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Affiliation of Author(s):
土木工程学院
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Journal:
ENGINEERING STRUCTURES
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Key Words:
Fiber beam element model; Rectangular/square; Concrete-filled steel tube columns; Unequal end moments; Member imperfection
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Abstract:
This paper develops a fiber-based model for rectangular/square concrete-filled steel tube (CFST) columns under arbitrary end moments considering the member imperfection. The accuracy of the proposed model regarding the prediction of capacity, deflection curves and full range curves is verified using a collected test database. The verified model is further used to investigate the behaviour of rectangular/square CFST columns under arbitrary end moments. It was found that the varying trends of strength and deformation capacity of rectangular/square CFST columns under arbitrary end moments are opposite while increasing the end moment ratio beta , L/r ratio and f c , whereas those are the same if increasing b/t ratio and f y . Higher f y and/or smaller b/t ratio may be adopted in order to achieve larger strength and deformation capacity simultaneously. The location of maximum deflection at peak state h kp / L is only significantly affected by end moment ratio beta , whereas the location of critical section at peak state h cp / L is significantly affected by end moment ratio beta , L / r ratio and yield strength f y . Moreover, current design codes, i.e., EC4, AISC 360 and GB50936-2014, were found to poorly predict the resistance to axial load and bending moment of rectangular/square CFST columns under arbitrary end moments.
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Co-author:
林思奇,杨迪,赵衍刚
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First Author:
Yan Xifeng
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Indexed by:
Journal paper
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Volume:
318/2024/118795
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ISSN No.:
0141-0296
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Translation or Not:
no
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Date of Publication:
2024-08-16
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