A quasi-static nonlinear analysis for assessing the fire resistance of reinforced concrete 3D frames exploiting time-dependent yield surfaces

Magisano, Domenico; Liguori, Francesco S.; Leonetti, Leonardo; Gregorio, Daniela De; Zuccaro, Giulio; Garcea, Giovanni

doi:10.1016/j.compstruc.2018.11.005

Cited by 14 publications

(3 citation statements)

References 46 publications

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“…Alternative fiber‐free approach can be also adopted. [ 32,39,40 ] Vector

\bar{\mathbf {t}}

is the particular solution of the differential equilibrium equations for the stress resultants and moments coming from the distributed loads. Finally, the global internal force vector

\mathbf {S}(\mathbf {u})

of the full finite element model is obtained by standard assemblage operations.…”

Section: Nonlinear Dynamic Analysis Of 3d Framesmentioning

confidence: 99%

A reduced order model for nonlinear time history seismic analyzes of elasto‐plastic 3D frame structures

Magisano

Corrado

Madeo

et al. 2022

Earthq Engng Struct Dyn

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A reduced order model for the nonlinear dynamic seismic analysis of elastoplastic 3D frame structures is presented. It is based on an approximated solution space for the displacement field that is assumed as the sum of two subspaces. The first subspace is generated by the relevant linear elastic modes of the generalized stiffness/mass linear eigenvalue problem in terms of participation factor. The second one is defined by collapse mechanisms associated to appropriate static load distributions. The time history analyzes are carried out within the reduced solution space, while the internal forces are evaluated on the full model to guarantee an accurate description of the constitutive laws. The proposed reduction method was tested for different structural geometries varying frequency content, direction and amplitude of the ground motion. Numerical results show accuracy and robustness also employing a few tens of modes, including elastic modes and plastic collapse mechanisms. In particular, the need for plastic modes in capturing the structural dynamics in case of seismic actions leading to significant plastic excursions is emphasized. This highlights the limits of simplified approaches based on the hypothesis of shape conservation in nonlinear problems, regardless of the building regularity.

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“…Alternative fiber‐free approach can be also adopted. [ 32,39,40 ] Vector

\bar{\mathbf {t}}

is the particular solution of the differential equilibrium equations for the stress resultants and moments coming from the distributed loads. Finally, the global internal force vector

\mathbf {S}(\mathbf {u})

of the full finite element model is obtained by standard assemblage operations.…”

Section: Nonlinear Dynamic Analysis Of 3d Framesmentioning

confidence: 99%

A reduced order model for nonlinear time history seismic analyzes of elasto‐plastic 3D frame structures

Magisano

Corrado

Madeo

et al. 2022

Earthq Engng Struct Dyn

Self Cite

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“…A proposal of numerical calculation for estimating global resistance to fire load in reinforced-concrete 3D frames is presented by Magisano, D. et al [35]. A simple, accurate, and efficient numerical procedure for calculating contribution of longitudinal force and biaxial bending of RC frame under fire is derived in the paper.…”

Section: Framementioning

confidence: 99%

Overview of research on fire effects in RC elements and assessment of RC structures after fire

Lakušić¹

2021

JCE

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Procedures for estimating damage and remaining bearing capacity of RC structures after fire are presented in the paper. The paper describes the effect of fire on structures, the danger it poses for the loss of human lives, and financial losses it may generate. The damage to structural RC elements of a column, beam, slab, wall, and connection details, is presented in the paper. Although RC elements are generally considered to be fire resistant, their physical and mechanical characteristics are greatly influenced by temperature, while the bearing capacity before and after fire can be determined through a number of different methods that are presented in the paper. An overview of condition assessment for RC structures after fire is proposed, and methodology for taking further action is presented.

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“…Padre et al [3] implemented an algorithm to check the resistance of reinforced concrete sections to oblique unsymmetrical bending at ambient temperature and in a fire situation. Magisano et al [16] proposed an automatic procedure for evaluating the axial force-biaxial bending yield surface of reinforced concrete sections in fire and a strategy to determine the limit fire duration, that is, the time of exposure which leads to structural collapse. Schulthess et al [17] presented a method named hybrid fire testing and validated it with multiple proof-of-concept tests covering the entire temperature range relevant to structural fire engineering.…”

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confidence: 99%

Numerical evaluation of aggregate size influence on concrete mechanical damage under high temperatures

Dal-Sasso

Assis

Farage

et al. 2023

Rev. IBRACON Estrut. Mater.

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The influence of aggregate size on the degradation process of material exposed to high temperatures is not a consensus among the scientific community because changes in the microstructure impact the macrostructural performance. To contribute to this investigation this work presents a thermomechanical model to evaluate aggregate size influence on the concrete mechanical damage under high temperatures. The material is considered as two-phase - aggregate and matrix - and three-phase - in which the interfacial transition zone is added. Concerning geometries, models in 2D and 3D are simulated. A finite element software is used with a weak coupling strategy that reduces the computational cost, and a user subroutine is implemented to define the constitutive model. The results show that the aggregate size influences both the average damage and the damage distribution along the synthetic specimen.

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A quasi-static nonlinear analysis for assessing the fire resistance of reinforced concrete 3D frames exploiting time-dependent yield surfaces

Cited by 14 publications

References 46 publications

A reduced order model for nonlinear time history seismic analyzes of elasto‐plastic 3D frame structures

A reduced order model for nonlinear time history seismic analyzes of elasto‐plastic 3D frame structures

Overview of research on fire effects in RC elements and assessment of RC structures after fire

Numerical evaluation of aggregate size influence on concrete mechanical damage under high temperatures

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