GFRP reinforced concrete slabs in fire: Finite element modelling

Hajiloo, Hamzeh; Green, Mark F.

doi:10.1016/j.engstruct.2019.01.028

Cited by 34 publications

(13 citation statements)

References 29 publications

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“…More details of the temperature predictions are given in Section 6. A similar method was also adopted by Hajiloo and Green [47] to obtain a reliable definition of the thermal conductivity of concrete at high temperatures. The density of concrete is considered to be 2300 kg/m 3 , which is usually assumed to be constant at high temperatures [47,61].…”

Section: Thermal Properties Of Concrete and Frp Barsmentioning

confidence: 99%

“…In the heat transfer analysis, the temperature-dependent thermal properties (i.e., thermal conductivity, specific heat capacity, and density) of FRP bars are determined based on the experimental results reported by Griffis et al [63]. Such thermal properties of FRP composites were also used in previous numerical and FE studies to predict the temperature responses of RC members with externally bonded or internally reinforced FRP reinforcements [29,39,41,47].…”

Section: Thermal Properties Of Concrete and Frp Barsmentioning

confidence: 99%

“…This is because compared with steel bars, the FRP bars exhibit more significant reductions in the mechanical and bond properties at high temperatures. Apart from the fire tests, some numerical or finite element (FE) models are also proposed in the literature to predict the fire performance of FRP-RC flexural members [14,[47][48][49][50][51]. The numerical and test results provided in the existing literature have promoted a good understanding of the thermal and structural responses of FRP-RC flexural members under fire exposure [51,52].…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, the bond behavior between the FRP bars and the concrete plays a crucial role in governing the load transfer between FRP and concrete as well as the structural responses and fire performance of FRP-RC flexural members [58,59]. However, almost all existing numerical and FE studies [14,[47][48][49][50][51] neglect the influence of bond degradations at high temperatures on the fire performance of FRP-RC flexural members. The proposed FE model is expected to act as a reliable computational tool for the parametric study of FRP-RC flexural members under fire exposure.…”

Section: Introductionmentioning

confidence: 99%

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Fire Performance of FRP-RC Flexural Members: A Numerical Study

et al. 2022

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Fiber-reinforced polymer (FRP) bars are increasingly used as a substitute for steel reinforcements in the construction of concrete structures, mainly due to their excellent durability characteristics. When FRP bar-reinforced concrete (referred to as FRP-RC for simplicity) members are used in indoor applications (e.g., in buildings), the fire performance of FRP-RC members needs to be appropriately designed to satisfy safety requirements. The bond behavior between the FRP bar and the surrounding concrete governs the composite action between the two materials and the related structural performance of the FRP-RC flexural member that will be affected when exposed to fire. However, there is a lack of reliable numerical models in the literature to quantify the effect of bond degradations of the FRP bar-to-concrete interface at high temperatures on the fire performance of FRP-RC flexural members. This paper presents a three-dimensional (3D) finite element (FE) model of FRP-RC flexural members exposed to fire and appropriately considers the temperature-dependent bond degradations of the FRP bar-to-concrete interface at high temperatures. In addition, the thermal properties of concrete and FRP bars are considered in the heat transfer analysis to predict the cross-sectional temperatures of the FRP-RC members under fire exposure. In the FE model, the mechanical properties and constitutive laws of concrete and FRP bars at high temperatures in addition to the bond degradations between them have been properly defined, thereby accurately predicting the global and local structural responses of the FRP-RC members under fire exposure. The proposed FE model has been validated by comparing the FE predictions (both temperature and midspan deflection responses during fire exposure) and the full-scale fire test results reported in the literature. The validated FE model is then used to study the effects of bond degradations on the global and local structural responses of the FRP-RC members under fire exposure. It is proved that the temperature-dependent bond degradations need to be considered to achieve accurate predictions of the failure mode and deflection responses.

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Section: Thermal Properties Of Concrete and Frp Barsmentioning

confidence: 99%

Section: Thermal Properties Of Concrete and Frp Barsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Fire Performance of FRP-RC Flexural Members: A Numerical Study

et al. 2022

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“…Exploratory examinations can be adequately used to approve numerical models and research basic parameters in the fire execution of strengthened solid components. Hajiloo and Green (2019) examine the different parameters in displaying of strengthened concrete in a fire and recognizes the coefficient of thermal expansion of the concrete and fortifying bars as the massive parameter in predicting the variation behavior in a fire. To address this need, this paper displays the advancement and approval of a nonlinear limited component (FE) model to simulate the structural execution of glass fiber reinforced polymer (GFRP) slabs in fires.…”

Section: Literature Surveymentioning

confidence: 99%

Progressive collapse behavior of reinforced concrete frame exposed to high temperature

Parthasarathi

Satyanarayanan

2020

JSFE

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Purpose Technological innovations in the construction field correspond to a wider revolution in metropolitan life and in structural design. With the demand for advanced concrete technology, the introduction of new reinforced materials in concrete, namely, iron, steel and other reinforcing elements. Reinforcement in concrete is developed in the centuries back and several advancements are being stirred to improvise the properties of the concrete through reinforcements. On the basis of this finding from the earlier research studies, a reinforcement methodology is practiced on the current study to investigate the deflection of the M30 mix concrete frame under thermal load conditions. Design/methodology/approach For the examination, corner and the middle frame are considered with the reinforcement provided on four zones with 16-mm diameter for compression and 8-mm diameter is used for the stirrup at 150 mm c/c spacing. The load is applied to the column with live and wall load of 3.5 kN/m and 14.7KN/m. The experimentation is carried out by the finite element analysis strategy in ABAQUS simulation software with five test conditions with the bare frame at single, two and three-bay infill. The model of the frame is developed and meshed with the meshing type of C3D8T under 8-node thermally coupled brick mesh type for the mesh size of 25 mm. Findings From the simulation outcome, the effect of thermal gradient on the reinforced concrete is analyzed and its structural properties are plotted as performance graphs in the result section. Originality/value Under the thermal load condition, the model is simulated for 180 min for five different cases and analyzed the deflection parameters such as deformation, stress and failure rate.

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Post-Fire Residual Capacity of Reinforced Concrete Beam

Bhuiyan

Ahmed

2021

Lecture Notes in Civil Engineering

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GFRP reinforced concrete slabs in fire: Finite element modelling

Cited by 34 publications

References 29 publications

Fire Performance of FRP-RC Flexural Members: A Numerical Study

Fire Performance of FRP-RC Flexural Members: A Numerical Study

Progressive collapse behavior of reinforced concrete frame exposed to high temperature

Post-Fire Residual Capacity of Reinforced Concrete Beam

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