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A platform for research: civil engineering, architecture and urbanism
Experimental behavior of concrete-filled double-skin tubular columns with outer galvanized corrugated steel tubes under axial compression
https://orcid.org/0000-0003-2915-3898
Highlights Concrete-filled double-skin tubular (CFDST) columns with outer galvanized corrugated steel tubes (CSTs) were tested. Failure mode, strength, strain and ductility were investigated considering different parameters. Strain response in the crest, might and trough of outer CSTs were compared. Applicability of the current standard design code formulae and axial load capacity models for circular CFDSTs was evaluated. An axial load capacity model for CFDSTs with outer CSTs was proposed.
Abstract Twelve lightweight and corrosion-resistant concrete-filled double-skin tubular (CFDST) columns with outer galvanized corrugated steel tubes (CSTs) and inner flat carbon steel tubes were subjected to monotonic axial compression tests. Compared to a traditional CFDST column, a CFDST column with a CST as the outer tube can reduce the longitudinal stress transmitted by the steel and better provide hoop confinement for the sandwiched concrete. The key parameters were the hollow ratio (χ) and inner tube thickness (ti). The failure mode, axial load capacity, strain and ductility of specimens with different parameters were analysed. There was noticeable slippage at the lock seam of the CST under axial loading, which releases the CST and results in the relatively low strength and ductility of the specimens. Keeping other parameters constant, an increase in χ and a decrease in ti led to a reduction in the peak load (Nu), strength index (SI) and ultimate strain (εcc). On the other hand, the ductility index (DI) increased as χ and ti increased. The strain development of the outer CST in one corrugation period was nonuniform. The hoop strain (εho) dominated at the crest of the CST, while the vertical strain (εvo) dominated at the trough. εvo gradually decreased from the trough to the crest, whereas εho increased from the trough to the crest. The applicability of the current standard design code formulae and axial load capacity equations for circular CFDST columns was evaluated using a newly expanded database, and a satisfactory axial load capacity model for circular CFDST columns with outer CSTs was proposed.
Experimental behavior of concrete-filled double-skin tubular columns with outer galvanized corrugated steel tubes under axial compression
https://orcid.org/0000-0003-2915-3898
Highlights Concrete-filled double-skin tubular (CFDST) columns with outer galvanized corrugated steel tubes (CSTs) were tested. Failure mode, strength, strain and ductility were investigated considering different parameters. Strain response in the crest, might and trough of outer CSTs were compared. Applicability of the current standard design code formulae and axial load capacity models for circular CFDSTs was evaluated. An axial load capacity model for CFDSTs with outer CSTs was proposed.
Abstract Twelve lightweight and corrosion-resistant concrete-filled double-skin tubular (CFDST) columns with outer galvanized corrugated steel tubes (CSTs) and inner flat carbon steel tubes were subjected to monotonic axial compression tests. Compared to a traditional CFDST column, a CFDST column with a CST as the outer tube can reduce the longitudinal stress transmitted by the steel and better provide hoop confinement for the sandwiched concrete. The key parameters were the hollow ratio (χ) and inner tube thickness (ti). The failure mode, axial load capacity, strain and ductility of specimens with different parameters were analysed. There was noticeable slippage at the lock seam of the CST under axial loading, which releases the CST and results in the relatively low strength and ductility of the specimens. Keeping other parameters constant, an increase in χ and a decrease in ti led to a reduction in the peak load (Nu), strength index (SI) and ultimate strain (εcc). On the other hand, the ductility index (DI) increased as χ and ti increased. The strain development of the outer CST in one corrugation period was nonuniform. The hoop strain (εho) dominated at the crest of the CST, while the vertical strain (εvo) dominated at the trough. εvo gradually decreased from the trough to the crest, whereas εho increased from the trough to the crest. The applicability of the current standard design code formulae and axial load capacity equations for circular CFDST columns was evaluated using a newly expanded database, and a satisfactory axial load capacity model for circular CFDST columns with outer CSTs was proposed.
Experimental behavior of concrete-filled double-skin tubular columns with outer galvanized corrugated steel tubes under axial compression
https://orcid.org/0000-0003-2915-3898
Highlights Concrete-filled double-skin tubular (CFDST) columns with outer galvanized corrugated steel tubes (CSTs) were tested. Failure mode, strength, strain and ductility were investigated considering different parameters. Strain response in the crest, might and trough of outer CSTs were compared. Applicability of the current standard design code formulae and axial load capacity models for circular CFDSTs was evaluated. An axial load capacity model for CFDSTs with outer CSTs was proposed.
Abstract Twelve lightweight and corrosion-resistant concrete-filled double-skin tubular (CFDST) columns with outer galvanized corrugated steel tubes (CSTs) and inner flat carbon steel tubes were subjected to monotonic axial compression tests. Compared to a traditional CFDST column, a CFDST column with a CST as the outer tube can reduce the longitudinal stress transmitted by the steel and better provide hoop confinement for the sandwiched concrete. The key parameters were the hollow ratio (χ) and inner tube thickness (ti). The failure mode, axial load capacity, strain and ductility of specimens with different parameters were analysed. There was noticeable slippage at the lock seam of the CST under axial loading, which releases the CST and results in the relatively low strength and ductility of the specimens. Keeping other parameters constant, an increase in χ and a decrease in ti led to a reduction in the peak load (Nu), strength index (SI) and ultimate strain (εcc). On the other hand, the ductility index (DI) increased as χ and ti increased. The strain development of the outer CST in one corrugation period was nonuniform. The hoop strain (εho) dominated at the crest of the CST, while the vertical strain (εvo) dominated at the trough. εvo gradually decreased from the trough to the crest, whereas εho increased from the trough to the crest. The applicability of the current standard design code formulae and axial load capacity equations for circular CFDST columns was evaluated using a newly expanded database, and a satisfactory axial load capacity model for circular CFDST columns with outer CSTs was proposed.
Experimental behavior of concrete-filled double-skin tubular columns with outer galvanized corrugated steel tubes under axial compression
Wang, Gaofei (author) / Wei, Yang (author) / Zhang, Yirui (author) / Liu, Lin (author) / Lin, Yu (author)
Engineering Structures ; 295
2023-09-02
Article (Journal)
Electronic Resource
English