Stress–strain model for FRP confined heat-damaged concrete columns

Shayanfar, Javad, Barros, Joaquim A.O. and Rezazadeh, Mohammadali (2023) Stress–strain model for FRP confined heat-damaged concrete columns. Fire Safety Journal, 136. p. 103748. ISSN 0379-7112

Stress–strain Rezazadeh_model for FRP confined heat-damaged concrete columns.pdf - Accepted Version
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This paper is dedicated to the development of a new analysis-oriented model to simulate the axial and dilation behavior of FRP confined heat-damaged concrete columns under axial compressive loading. The model's calibration has considered the experimental results from concrete circular/square cross-section specimens submitted to a certain level of heat-induced damage, which after attained the environmental temperature, were fully confined with FRP jacket and tested. New equations were developed to determine the mechanical characteristics of unconfined heat-damaged concrete by performing regression analysis on a large database of experimental tests. Based on a parametric study on dilation behavior of FRP confined heat-damaged columns, a new dilation model was developed to predict concrete lateral strain at a given axial strain, dependent on the thermal damage level. By using this dilation model, a new methodology was introduced for predicting the axial stress-strain response of FRP confined heat-damaged columns in compliance with the active confinement approach. The adequate predictive performance of the model is demonstrated by estimating experimental axial stress-strain results.

Item Type: Article
Additional Information: Funding information: This study is a part of the project ‘‘StreColesf_Innovative technique using effectively composite materials for the strengthening of rectangular cross-section reinforced concrete columns exposed to seismic loadings and fire’‘, with the reference POCI-01-0145-FEDER-029485. The first author also acknowledges the support provided by FCT PhD individual fellowship 2019 with the reference of “SFRH/BD/148002/2019”.
Uncontrolled Keywords: FRP confined heat-damaged concrete, Thermal damage, Confinement model, Dilation behavior
Subjects: H800 Chemical, Process and Energy Engineering
Department: Faculties > Engineering and Environment > Mechanical and Construction Engineering
Depositing User: Rachel Branson
Date Deposited: 27 Jan 2023 10:46
Last Modified: 23 Jan 2024 03:30

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