Abstract
In the present article the failure behaviour of a steel, beam type element supported against fire by protection boards, is studied. Three – dimensional, coupled temperature - displacement, non-linear finite element analysis models have been developed to simulate the unprotected and protected structure. A simple modelling approach is proposed for the investigation of the influence of the gradual failure of fire protection at elevated temperatures, on the structural performance of the system, under thermal and mechanical loads. Yielding of steel is depicted and force – displacement diagrams are used to evaluate the ultimate behaviour of the unprotected and protected models. It is shown that for the protected structure, yielding is less severe and the time period up to maximum strength is significantly longer. Eventually, is depicted how failure of the fire protection leads to a gradual reduction of the response, in fire conditions.
Highlights
Structural steel, is a widely used material, due to its high thermal conductivity rapidly loses its strength when exposed to elevated temperatures
According to the diagram received from the unprotected structure, are recognized three phases related to the structural behaviour of the tested element at elevated temperatures under mechanical loading
F undamental goal of this research is to offer a simple modelling technique, able to quantify the structural performance of protected steel structures in fire conditions
Summary
Structural steel, is a widely used material, due to its high thermal conductivity rapidly loses its strength when exposed to elevated temperatures. The goal of this research is twofold: First, to recommend a simplified modelling technique for the consideration of the effect of the gradual failure of the protection, under fire conditions and mechanical loads This is an effort towards imitating the behaviour of steel structures in fire conditions, where due to elevated temperatures, re-distribution of forces and failure of some steel members, both gradual damage of the passive protection and mechanical loads arise. For the implementation of the mentioned ideas, a non-linear finite element analysis model is developed, where concrete fire protection boards are assigned to one, or more sides of a steel element Both a standard temperature – time thermal load curve and a force – time mechanical load curve are simultaneously considered in the framework of coupled temperature – displacement finite element analysis
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