Cyclic behavior of circular CFST stub columns with different inner constructions. (1st August 2022)

• Record Type: Journal Article
• Authors: Dong, Hongying; Liang, Xu; Cao, Wanlin; Zhao, Lidong; Zhang, Jianwei
• Is Part Of: Journal of building engineering. Volume 53(2022)
• Publication Date: 2022-08-01
• Subjects: Circular concrete-filled steel tube (CFST) stub columns -- Inner constructions -- Low-cyclic loading test -- Seismic behavior -- Load-bearing capacity; Building -- Periodicals; 690.05
• DOI: 10.1016/j.jobe.2022.104549
• Languages: English
• ISSNs: 2352-7102

Abstract

Abstract: Circular concrete-filled steel tube (CFST) columns, which are widely used in high-rise and super high-rise buildings, have good mechanical performance. Low-cyclic loading tests were conducted on eight large-sized specimens with different shear-to-span ratios to investigate the seismic performance of circular CFST stub columns with different inner constructions (an internal circular steel tube, built-in partitions, vertical stiffeners, circumferential stiffeners, and a built-in reinforcement cage). The results show that built-in partitions coordinated the common deformation of the internal and external steel tubes, providing the specimen with the best seismic performance. By setting an internal circular steel tube in circular CFST stub columns, a significant confining effect on the core concrete was generated and the deformation of the external steel tube was well developed, which significantly improved the seismic performance of the specimens. Setting circumferential stiffeners had a significant confining effect on the radial deformation of the steel tube, and placing vertical stiffeners between the circumferential stiffeners had an obvious effect on preventing local buckling and improving the flexural capacity of the steel tube. The energy dissipation capacity of the specimens with different inner constructions was better when the shear-to-span ratio was smaller. A method for calculating the peak bearing capacity of such circular CFST stub columns is proposed, which can accurately predict the peak bearing capacity of the columns and provide a basis for the calculation of their application in practical engineering. Graphical abstract: Image 1 Highlights: Low-cyclic loading tests were conducted on eight large-sized circular CFST stub columns. A method for calculating the bearing capacity of the circular CFST stub columns is proposed. The seismic performance of columns is analyzed.