Concrete Filled Steel Column Fire Resistance

Article 5 2 3 of asce sfpe 29 99 specifies a simple method to determine the fire resistance of concrete filled hollow steel columns.

Concrete filled steel column fire resistance.

The fire resistance of concrete filled square steel tube columns cft columns without fire protection under a constant axial load has been previously examined. 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. 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. This paper introduces simplified design methods for calculating the load bearing capacity of axially loaded concrete filled carbon steel tubular cfst stub columns and concrete filled stainless steel tubular cfsst stub columns.

The relevant background information could be found in. Refined finite element fe models are developed for capturing the fire performance of cfst and cfsst stub columns under iso 834 fire. This paper presents a nonlinear thermal stress analysis method for predicting the mechanical behavior and. 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. A concrete filled structural hollow section provides architects and engineers with a robust and inherently fire resistance column. 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. This publication contains design information for these columns.

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. Concrete filled hss columns are another example of generic construction that has not been listed in the ul directory. A mathematical model to calculate the temperatures deformations and fire resistance of the columns is presented. The purpose of this present study is to investigate the fire resistance of cft columns when they are subjected to combined loads.

Calculated results are compared with those measured.