Buckling resistance of concrete-filled cold-formed steel (CF-CFS) built-up short columns under compression

Design Model of Rectangular Concrete-Filled Steel Tubular Stub Columns under Axial Compression

“…CFSTs with regular cross-sections, such as circular, square and rectangular shapes, have been widely investigated [4], yet some research has been conducted on other cross-sectional shapes, for example, Chang et al [5] conducted an experimental and numerical study to investigate the static axial performance of stiffened concrete-filled double-skin steel tubular (CFDST) stub columns with circular and square shapes. In addition, Rahnavard et al [6,7] conducted experimental and numerical analysis on four different cross-section shapes of fabricated concrete-filled cold-formed steel (CF-CFS) short and long columns. For both long and short columns, it was found that the ultimate strengths of the concrete-filled columns were higher than that of hollow columns.…”

Equivalent Temperature Prediction for Concrete-Filled Cold-Formed Steel (Cf-Cfs) Built-Up Column Sections (Part B)

“…Cold-formed steel profiles have several advantages over those hot rolled, including shorter construction time, economic efficiency, and accessible transportation [1][2][3][4][5][6][7][8][9][10][11][12][13][14]. Extensive experimental, computational, and analytical research has been undertaken over the last decades to understand better the behavior of composite columns exposed to fire [15][16][17][18][19][20][21][22][23][24][25][26]. A simple design approach for CFST columns in a fire was provided by Ukanwa et al [19][20][21][22].…”

Equivalent Temperature Prediction for Concrete-Filled Cold-Formed Steel (Cf-Cfs) Built-Up Column Sections (Part a)

“…These structural components have high structural fire performance. Recently studies were carried out on applying cold-formed steel profiles and lightweight concrete instead of hot-rolled and normal concrete [1,2]. The cold-formed steel profiles have advantages over hot-rolled profiles, such as less difficulty in transportation, high strength-to-weight ratio, ease of fabrication, less construction time, ability to generate various cross-section shapes [3][4][5][6].…”

“…Understanding the behavior of these columns subjected to accidental fire action is necessary further to enhance the fire performance of such structural members. In the last few decades, a great deal of experimental, computational, and analytical work has been done to better understand the behavior of composite columns when subjected to fire [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15]. Espinos et al [8] numerically compared the fire resistance of concrete-filled steel tubular composite columns and concrete-filled steel tubular composite columns with a steel core.…”

“…Prior work by the authors [1,2] demonstrated the compression behavior of the CF-CFS column at both room temperature and increased temperatures. Even though extensive experimental and numerical investigations into the fire resistance of composite columns have been carried out, advanced tools such as finite element analysis are still required to determine the temperature distribution in the cross-section and, therefore, to determine the fire resistance composite columns.…”