Finite element implementation for the analysis of 3D steel and composite frames subjected to fire

Abstract

This paper presents a finite element formulation for the numerical analysis of three-dimensional framed steel, reinforced concrete or composite steel and concrete structures subjected to fire. Several specialized and commercial programs may be used for the analysis of structures in fire condition. Within this context, the purpose of this work is to present the steps taken to extend a previously developed static analysis procedure with beam elements in order to cope with the thermal and structural analysis of structures under fire action. Physical nonlinearity and material property degradation considering the temperature distribution are taken into account at the cross section level, which is divided into quadrilateral or triangular finite elements. Thermal strains are considered through the effective strain concept, and the resulting nonlinear system of equations is solved by the Newton-Raphson scheme. The accuracy and capability of the formulation to simulate the behavior of framed structures under fire action are assessed through comparison with various numerical and experimental results.

Determination of the technical state of buildings and constructions after force and temperature influences

“…And in [10], technical trends are presented in the development of methods for the thermotechnical calculation of reinforced concrete structures, as well as the calculation of the heat loss of the foundation slab with uneven temperature profiles of the internal temperature. The determination of the strength and deformability of steel-reinforced concrete beams with various anchor stops and types of fire protection during three-sided heating is shown in [11,12].…”

“…Technical trends in the development of methods for thermotechnical calculation of reinforced concrete structures, the calculation of the heat loss of the base plate with uneven temperature profiles of the internal temperature are given in [10]. Determination of strength and deformability of steel-reinforced concrete beams with various anchor stops and types of fire protection during three-sided heating is shown in [11,12]. TECHNOLOGY AUDIT AND PRODUCTION RESERVES -№ 4/1(48), 2019 ISSN 2226-3780 In connection with the foregoing, it becomes necessary to carry out inspection work, determine controlled parameters (deflections, displacements, cracks, strength and deformability of structural materials, etc.)…”

Determination of remaining resource of constructions of buildings after different influences

“…In [14], a methodology for thermotechnical calculation of reinforced concrete structures and heat loss of a foundation slab with non-uniform temperature distributions of the internal temperature is presented. The determination of the strength and deformability of steel-reinforced concrete beams with various anchor stops and types of fire protection during three-sided heating is shown in [15,16].…”

The Behavior of a Multi-Story Steel Frame Subject to Measured Fire Using Calibrated Simple Approach

“…FEM is powerful for handling formulations with both material and geometric nonlinearities. To list a few, [10] and [11] proposed nonlinear formulation for predicting the plastic behavior unprotected steel members by accommodating elastoplastic strain hardening. SAFIR, developed by a group of researchers at the University of Liege, Belgium, is also a finite element based program [12].…”