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Behaviours of square UHPFRC-filled steel tubular stub columns under eccentric compression
https://orcid.org/0000-0002-7811-1232
Abstract Applications of ultra-high performance fiber-reinforced concrete (UHPFRC) in composite columns for high-rise buildings or bridges keep increasing to achieve improved structural performances. A testing program with 16 specimens was carried out to study the behaviour of UHPFRC-filled square steel tubular stub columns (UFST-SCs) under eccentric compression. Besides, influences of eccentric ratio (e/r) and thickness of steel tube (t s) on the behaviours of UFST-SCs were studied. The UFST-SCs under eccentric compression exhibited three working stages categorized as linear, nonlinear, and recession. Compression-flange yielding of steel tube and crushing of UHPFRC occurred at the elastic limit and peak load point of load-displacement curves, respectively. Despite the increasing e/r ratio decreased the stiffness and ultimate resistance of the UFST-SCs, its ductility was improved. Moreover, increasing thickness of steel tube enhanced the structural resistance of UFST-SCs under eccentric compression. The validations showed that EC4, AISC and GB50936 were conservative on estimating the N u-M u interaction relationships of UFST-SCs under eccentric compression. Considering the accuracy and reliability, EC4 was recommended to predict the N u-M u interaction curves of UFST-SCs.
Highlights Tests on behavior of CFST columns with UHPC under eccentric compression are performed. UFST-SCs under eccentric compression failed in plastic buckling of steel tube and crushing of UHPFRC. M-N interaction behaviors of CFST with UHPC under eccentric compression are reported. Code equations were checked on M − N interaction curves of CFST columns with UHPC.
Behaviours of square UHPFRC-filled steel tubular stub columns under eccentric compression
https://orcid.org/0000-0002-7811-1232
Abstract Applications of ultra-high performance fiber-reinforced concrete (UHPFRC) in composite columns for high-rise buildings or bridges keep increasing to achieve improved structural performances. A testing program with 16 specimens was carried out to study the behaviour of UHPFRC-filled square steel tubular stub columns (UFST-SCs) under eccentric compression. Besides, influences of eccentric ratio (e/r) and thickness of steel tube (t s) on the behaviours of UFST-SCs were studied. The UFST-SCs under eccentric compression exhibited three working stages categorized as linear, nonlinear, and recession. Compression-flange yielding of steel tube and crushing of UHPFRC occurred at the elastic limit and peak load point of load-displacement curves, respectively. Despite the increasing e/r ratio decreased the stiffness and ultimate resistance of the UFST-SCs, its ductility was improved. Moreover, increasing thickness of steel tube enhanced the structural resistance of UFST-SCs under eccentric compression. The validations showed that EC4, AISC and GB50936 were conservative on estimating the N u-M u interaction relationships of UFST-SCs under eccentric compression. Considering the accuracy and reliability, EC4 was recommended to predict the N u-M u interaction curves of UFST-SCs.
Highlights Tests on behavior of CFST columns with UHPC under eccentric compression are performed. UFST-SCs under eccentric compression failed in plastic buckling of steel tube and crushing of UHPFRC. M-N interaction behaviors of CFST with UHPC under eccentric compression are reported. Code equations were checked on M − N interaction curves of CFST columns with UHPC.
Behaviours of square UHPFRC-filled steel tubular stub columns under eccentric compression
https://orcid.org/0000-0002-7811-1232
Abstract Applications of ultra-high performance fiber-reinforced concrete (UHPFRC) in composite columns for high-rise buildings or bridges keep increasing to achieve improved structural performances. A testing program with 16 specimens was carried out to study the behaviour of UHPFRC-filled square steel tubular stub columns (UFST-SCs) under eccentric compression. Besides, influences of eccentric ratio (e/r) and thickness of steel tube (t s) on the behaviours of UFST-SCs were studied. The UFST-SCs under eccentric compression exhibited three working stages categorized as linear, nonlinear, and recession. Compression-flange yielding of steel tube and crushing of UHPFRC occurred at the elastic limit and peak load point of load-displacement curves, respectively. Despite the increasing e/r ratio decreased the stiffness and ultimate resistance of the UFST-SCs, its ductility was improved. Moreover, increasing thickness of steel tube enhanced the structural resistance of UFST-SCs under eccentric compression. The validations showed that EC4, AISC and GB50936 were conservative on estimating the N u-M u interaction relationships of UFST-SCs under eccentric compression. Considering the accuracy and reliability, EC4 was recommended to predict the N u-M u interaction curves of UFST-SCs.
Highlights Tests on behavior of CFST columns with UHPC under eccentric compression are performed. UFST-SCs under eccentric compression failed in plastic buckling of steel tube and crushing of UHPFRC. M-N interaction behaviors of CFST with UHPC under eccentric compression are reported. Code equations were checked on M − N interaction curves of CFST columns with UHPC.
Behaviours of square UHPFRC-filled steel tubular stub columns under eccentric compression
Yan, Jia-Bao (author) / Chen, Anzhen (author) / Zhu, Jin-Song (author)
Thin-Walled Structures ; 159
2020-10-14
Article (Journal)
Electronic Resource
English
Behaviour of concrete filled steel tubular (CFST) stub columns under eccentric partial compression
| Online Contents | 2011