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A platform for research: civil engineering, architecture and urbanism
Low-temperature compression behaviour of square CFST columns using Q960 ultra-high strength steel
Abstract This paper studied the low-temperature compression behaviours of concrete-filled Q960 ultra-high-strength-steel (UHSS) tubes (CFUT), which were developed for the high-performance Arctic engineering constructions. Fifteen stub CFUTs were tested at different low temperatures of 20, −30, −60, and −290 °C. The studied parameters in the testing program were low temperatures and thickness of Q960 UHSS tube. The low-temperature compression tests showed that the CFUTs failed in concrete crushing, outward local buckling and weld fracture at the corner of Q960 square UHSS tube. The Arctic low temperatures increased the compression capacity and stiffness, but reduced the ductility of CFUTs with Q960 UHSS tube. A 3D nonlinear finite element model (FEM) was built for simulations on the low-temperature compression behaviour of CFUTs with Q960 UHSS tube. Moreover, theoretical models on simulating load-shortening behaviours of CFUTs with Q960 UHSS tube at low temperatures were developed. Validations proved that the developed FEM and theoretical models predicted well compression behaviour of CFUTs with Q960 UHSS tube at low temperatures.
Graphical abstract Display Omitted
Highlights Low temperature improves load capacity of CFST with Q960 ultra-high strength steel (UHSS). CFST with Q960 UHSS exhibits close compression behaviours at both low and room temperatures. Developed FEM predicts well low-temperature behaviour of CFSTs with Q960 UHSS. Developed theoretical models predict well low-temperature P-Δ curves of CFUTs.
Low-temperature compression behaviour of square CFST columns using Q960 ultra-high strength steel
Abstract This paper studied the low-temperature compression behaviours of concrete-filled Q960 ultra-high-strength-steel (UHSS) tubes (CFUT), which were developed for the high-performance Arctic engineering constructions. Fifteen stub CFUTs were tested at different low temperatures of 20, −30, −60, and −290 °C. The studied parameters in the testing program were low temperatures and thickness of Q960 UHSS tube. The low-temperature compression tests showed that the CFUTs failed in concrete crushing, outward local buckling and weld fracture at the corner of Q960 square UHSS tube. The Arctic low temperatures increased the compression capacity and stiffness, but reduced the ductility of CFUTs with Q960 UHSS tube. A 3D nonlinear finite element model (FEM) was built for simulations on the low-temperature compression behaviour of CFUTs with Q960 UHSS tube. Moreover, theoretical models on simulating load-shortening behaviours of CFUTs with Q960 UHSS tube at low temperatures were developed. Validations proved that the developed FEM and theoretical models predicted well compression behaviour of CFUTs with Q960 UHSS tube at low temperatures.
Graphical abstract Display Omitted
Highlights Low temperature improves load capacity of CFST with Q960 ultra-high strength steel (UHSS). CFST with Q960 UHSS exhibits close compression behaviours at both low and room temperatures. Developed FEM predicts well low-temperature behaviour of CFSTs with Q960 UHSS. Developed theoretical models predict well low-temperature P-Δ curves of CFUTs.
Low-temperature compression behaviour of square CFST columns using Q960 ultra-high strength steel
Yan, Jia-Bao (author) / Luo, Yan-Li (author) / Su, Lingfeng (author) / Lin, Xuchuan (author) / Luo, Yun-Biao (author) / Zhang, Lingxin (author)
2021-04-24
Article (Journal)
Electronic Resource
English
CFST column , Low temperature , Compression test , High strength steel , Q960 , Finite element , Theoretical model , CDPM , concrete damage plasticity model , CFHT , concrete filled HSS tube , CFST , concrete-filled steel tube , CFSTC , concrete-filled steel tubular column , CFUT , concrete filled UHSS tube , COV , coefficient of variation , DI , ductility ratio , FE , finite element , FEA , finite element analysis , FEM , finite element model , HSC , high strength concrete , HSS , high-strength steel , LNG , liquid nitrogen gas , LVDTs , linear varying displacement transducers , NWC , normal weight concrete , OB , outward local buckling , PTT , prediction-to-test , UHSS , ultra-high-strength steel , WF , weld fracture