Concrete Filled Steel Column Fire Resistance

There is an equation to calculate the fire resistance of a concrete filled hss column that comes from asce 29 calculation methods for structural fire prevention and is shown in aisc design guide 19 fire resistance of structural steel framing the fire resistance depends on the effective length of the column the outside dimension.

Concrete filled steel column fire resistance.

Concrete filled steel tube columns have been widely applied in modern construction. Fire testing of a steel column protected by concrete masonry evaluates the structural integrity of the steel column under fire test conditions by measuring the temperature rise of the steel. This paper presents a nonlinear thermal stress analysis method for predicting the mechanical behavior and. However limited work has been done on the resistance of concrete filled steel tube columns subjected to non uniform fire conditions and a calculation method with clear physical meanings is useful to structural engineers.

The fire resistance of concrete filled square steel tube columns cft columns without fire protection under a constant axial load has been previously examined. Experimental and theoretical studies have been performed to predict the fire resistance of circular hollow steel columns filled with bar reinforced concrete. Article 5 2 3 of asce sfpe 29 99 specifies a simple method to determine the fire resistance of concrete filled hollow steel columns. The purpose of this present study is to investigate the fire resistance of cft columns when they are subjected to combined loads.

Refined finite element fe models are developed for capturing the fire performance of cfst and cfsst stub columns under iso 834 fire. A concrete filled structural hollow section provides architects and engineers with a robust and inherently fire resistance column. The main objective of this study is to investigate the effects of high strength structural steel on the fire resistance of concrete filled steel tubular cfst columns under constant axial load using finite element analysis. The calculated fire resistance rating of steel columns protected by concrete masonry as illustrated in figure 5 is determined by.

Columns in the british standard for fire resistant design of steel structures bs 5950 part 8 3 is used to find the limiting temperature of the steel tube in the cft column. Calculated results are compared with those measured. A 3 d finite element model was developed to carry out both the numerical heat transfer and nonlinear stress analyses. This publication contains design information for these columns.

The relevant background information could be found in.