Bond strength in concrete filled built-up steel tube columns with tab stiffeners

作者：Petrus Clotilda^*; Hamid Hanizah Abdul; Ibrahim Azmi; Nyuin Joe Davylyn

来源：Canadian Journal of Civil Engineering, 2011, 38(6): 627-637.

DOI：10.1139/L11-030

• concrete filled tube
• push out test
• bond strength
• stiffeners

Apart from strength and ductility, adequate bond between steel and concrete at the interface is important in concrete filled steel tube (CFST) columns to ensure a composite action. One way of improving the bond strength of a CFST column is introducing internal stiffeners. This paper presents an experimental investigation into the bond strength of a CFST column with tab stiffeners by conducting a push out test. Twenty-one square specimens of sides 200 mm x 200 mm, fabricated from 2 mm thick mild steel sheeting were tested in two series. The first series considered the variation in the tab spacing along the stiffeners, namely 75, 100, 150, and 300 mm, while in the second series, the concrete cube compressive strengths were 36, 40, and 50 MPa. The bond strength at the concrete-steel interface was found to increase with decreasing tab spacing. In-filling the tubes with higher strength concrete had also resulted in an increase in the bond strength by up to an average of 40%.

• 出版日期2011-6