Experimental Study of the Steel-Concrete Composite Columns under High Temperature
Seong-DeokKang*, Myoung-Ho Oh**, Myeong-HanKim***, Sang-Dae Kim*
*Department of Architectural Engineering, Korea University, Korea
**Department of Architectural Engineering, Mokpo National University, Korea
***Department of Architectural Engineering, Daejin University, Korea
Abstract
The main objective of this paper is to study the behaviour of Steel-Concrete(SC) columns at elevated temperatures by experimental test. The effects of load ratios, cross-section size and fire protection for the SC columns were investigated by the test and compared using the heat transfer analysis is performed on the basis of the finite element program ANSYS 10.0 using ISO834 standard fire, following the main guidelines proposed by the EC1 Part 2.2, EC4 Part 1.2.
As heat transfer is the movement of heat by conduction, convection, and radiation, and as temperature inside an object varies by position and time, heat distribution was analyzed by the function of position and time. As the steel’s thermal conductivity is higher than that of concrete, therefore, steel loses its strength rapidly for fire conditions. Fire resistance performance of the SC composite column under fire conditions was evaluated by calculating moment capacity and load ratio using heat transfer analysis for parametric element. The two general situations of unprotected and protected, 22mm, 44mm protection are considered
Fig 1. SC Column
Fig 2. Gauge Fig 3. Fireproofing
Fig 4. Time-Temperature Curve
Table 1. Temperature of SC Column (60min)Model / Section Size / Temperature (℃)
A gauge / B gauge / C gauge
SC1 / H300×300×18×18 / 357.1 / 769.9 / 847.9
SC2 / H300×300×10×15 / 305.2 / 792.2 / 860.6
SC3 / H300×300×8×8 / 294.5 / 807.4 / 877.0
Table 2. Temperature of SC Column (180min)
Model / Section Size / Fireproofing Thickness (mm) / Temperature (℃)
A gauge / B gauge / C gauge
SC2 / H300×300×10×15 / none / 716.1 / 1058.9 / 1087.6
SC4 / H300×300×10×15 / 11 / 324.0 / 370.6 / 405.0
SC5 / H300×300×10×15 / 22 / 270.6 / 289.9 / 310.4
SC6 / H300×300×10×15 / 33 / 246.2 / 255.6 / 271.3
SC7 / H300×300×10×15 / 44 / 234.6 / 239.6 / 253.3