Tests of Inclined Concrete‐Filled Steel Tubular Stub Columns under Vertical Cyclic Loading

Abstract

This paper presents an experimental study on the cyclic behavior of fifteen concrete-filled steel tubular columns subjected to vertical cyclic loading. All test samples’ cross-sectional area is 75 × 75 mm2 square, and they are 500 mm long. The main variables in the test are the thickness of the steel tube (1.8 and 3.0 mm with the width-to-thickness ratios (b/t) of 41.7 and 25), the strength of the infilled concrete (no-fill, 23 MPa, and 42 MPa), and the inclined angle (0, 4, and 9 degrees). The results show that all samples failed due to local buckling in compression followed by tearing of the steel tube in tension. The inclination angles of 4 and 9 degrees decreased the vertical compressive capacity of the 1.8 mm vertical hollowed steel column by 34 and 39 percent, respectively. However, the infilled concrete and thicker tube (3.0 mm) could substantially reduce the adverse effect of the inclination angle. The compressive ductility of the hollowed column with the thinner tube was significantly enhanced by the infilled concrete as well.

Capacity prediction of straight and inclined slender concrete-filled double-skin tubular columns

“…Hansapinyo et al. (2018) studied 15 hollow and CFST stub columns tested under cyclic vertical loading.…”

“…Inclined columns are subjected to additional moments and have to be studied thoroughly in order to provide a sufficient design of these members. Hansapinyo et al (2018) studied 15 hollow and CFST stub columns tested under cyclic vertical loading. These columns were inclined at 08, 48 and 98.…”

Seismic behavior and damage assessment of concrete‐filled steel tube columns in diagrid structures

“…In contrast, the mechanical behavior and seismic responses of CFST columns subjected to axial cyclic loading in diagrid structures are significantly different from those of bending members, but research on the seismic behavior of inclined CFST columns is lacking. The only research on CFST columns under axial cyclic loading is limited to the slender columns used as bracing members [ 24–26 ] and has little significance for guiding the design of inclined CFST columns with smaller length‐to‐diameter ratios in diagrid structures. Therefore, experimental evidence is required to provide insight into the failure mechanism and seismic behavior of CFST columns under axial cyclic loading.…”

Axial Cyclic Testing of Concrete‐Filled Steel Tube Columns in Diagrid Structures

“…For the components, Zhou et al [5], Kim et al [6], and Han et al [7] conducted pseudostatic tests on intersecting nodes in the diagrid structure and analysed the force mechanism and hysteresis performance under axial cyclic loads; however, the relevant research on inclined CFST columns in diagrid structures is still in the initial stage. Currently, the studies on CFST columns mainly focus on the monotonic behaviour of vertical bearing members and the seismic performance of lateral force-resistance components [8][9][10][11][12][13][14][15], while minimal research has focused the mechanical behaviour under cyclic loads of components such as lateral braces [16,17], and few studies have been conducted on the mechanical behaviour of the inclined CFST columns under cyclic axial loads, which are the major components of the diagrid structure.…”