Progressive collapse evaluation of RC frames under high-temperature conditions: Experimental and finite element investigations

Parthasarathi, N.; Satyanarayanan, K.S.; Prakash, M.; Farsangi, Ehsan Noroozinejad; Thirumurugan, V.; Srinivasasenthil, S.

doi:10.1016/j.istruc.2022.05.037

Cited by 8 publications

(6 citation statements)

References 23 publications

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“…30 In room temperature (29°C), all the frames undergo structural deformation (downwards) due to loads as there is no temperature effect. 31,32 BF undergoes more axial deformation in room temperature than BFS and FSIF. The presence of the slab and infill wall does not allow the frame to deform and offers more resistance than BF.…”

Section: Deformation Due To Temperature and Loadsmentioning

confidence: 99%

Effect of thermal expansion on three-dimensional reinforced concrete frames under high temperature

Vishal

Satyanarayanan

2023

Proceedings of the Institution of Mechanical Engineers, Part C:

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When exposed to high temperatures, reinforced concrete members undergo major changes in their properties which in turn affects their structural performance. Fire accidents in frame structures at local or global level may lead to collapse of structures. Structural fire has dire consequences like collapse of structures, colour changes, spalling of concrete and failure of essential elements. It is essential to study the conduct of reinforced concrete frame under thermal expansion in order to understand fire-induced collapse of concrete structures. This study observes how a three dimensional single-bay single-storey reinforced concrete frame is performed under thermo-mechanical analysis in ABAQUS (FEA). The paper aims to note the effect of slab and infill wall with respect to thermal expansion. The paper also discusses the main findings regarding the structural performance, structural leading conditions and structural stiffness of the reinforced concrete frame with slab and infill wall under thermal expansion. The results found that the infill frame has better stiffness and performs well under fire conditions.

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Section: Deformation Due To Temperature and Loadsmentioning

confidence: 99%

Effect of thermal expansion on three-dimensional reinforced concrete frames under high temperature

Vishal

Satyanarayanan

2023

Proceedings of the Institution of Mechanical Engineers, Part C:

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“…The rehabilitation of RC beams helps identify potential weaknesses and assess the effectiveness of rehabilitation measures under various scenarios. This analysis is particularly relevant for ensuring the structural integrity and safety of the rehabilitated beam, as it accounts for time-dependent effects that static analyses may overlook [8].…”

Section: Introductionmentioning

confidence: 99%

Transient state analysis of rehabilitated RC beams using finite element modelling and prediction using an artificial neural network

2024

Eng. Res. Express

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The present research develops and verifies a simpler numerical approach for analyzing the thermal transient state of rehabilitated concrete beams reinforced with various types of FRP (fiber-reinforced polymer) subjected to high temperatures and specifically built as under-reinforced concrete beams. This approach offers a straightforward, efficient, and exact instrument for numerical analysis. The proposed analytical technique has been validated by load-displacement curves and cross-section temperature data, indicating its dependability and practicality. Subsequently, the validated approach was used to examine the impact of significant variables on the outcome and restoration of FRP-reinforced concrete beams at high temperatures. The methodology gives the Comparing conventional and CFRP, GFRP, AFRP reinforced beams using beam, truss, and shell elements. Thermal and UDL loads were applied, mesh at 25mm x 25mm. Transient analysis contrasts performance via displacement and temperature. The temperature vs. displacement curve shows the FRP comparisons. Identifying the critical temperature before failure is crucial, emphasizing the curve's significance in assessing structural performance and potential failure points. Nodal temperatures ranged 939-963°C (rehabilitated) vs 958°C (conventional). 200°C difference affects thermal boundary conditions for structural analysis and Conventional peaks at 320°C, while AFRP, GFRP, and CFRP reach 358°C, 385°C, and 390°C respectively. CFRP lasts 2400 minutes. Neural network models demonstrate effective generalizability, enabling satisfactory predictions of RC beam rehabilitation with CFRP laminates within the study's parameter range.

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“…The failure of a single structural element may trigger the failure of an entire structure. This phenomenon is termed progressive collapse (Murugan and Srinivasan, 2021; Parthasarathi et al ., 2022; Vishal and Satyanarayanan, 2021). While designing as well as during construction, columns and beams were given the most priority compared to any other structural member.…”

Section: Introductionmentioning

confidence: 99%

“…The current issue and full text archive of this journal is available on Emerald Insight at: https://www.emerald.com/insight/2040-2317.htm single structural element may trigger the failure of an entire structure. This phenomenon is termed progressive collapse (Murugan and Srinivasan, 2021;Parthasarathi et al, 2022;. While designing as well as during construction, columns and beams were given the most priority compared to any other structural member.…”

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confidence: 99%

Study on optimum concrete cover thickness in RC beam and columns under high temperature

Vishal

Satyanarayanan²

2023

JSFE

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PurposeThis study delineates the effect of cover thickness on reinforced concrete (RC) columns and beams under an elevated fire scenario. Columns and beams are important load-carrying structural members of buildings. Under all circumstances, the columns and beams were set to be free from damage to avoid structural failure. Under the high-temperature scenario, the RC element may fail because of the material deterioration that occurs owing to the thermal effect. This study attempts to determine the optimum cover thickness for beams and columns under extreme loads and fire conditions.Design/methodology/approachCover thicknesses of 30, 40, 45, 50, 60 and 70 mm for the columns and 10, 20, 25, 30, 35, 40, 50, 60 and 70 mm for the beams were adopted in this study. Both steady-state and transient-state conditions under thermomechanical analysis were performed using the finite element method to determine the heat transfer through the RC section and to determine the effect of thermal stresses.FindingsThe results show that the RC elements have a greater influence on the additional cover thickness at extreme temperatures and higher load ratios than at the service stages. The safe limits of the structural members were obtained under the combined effects of elevated temperatures and structural loads. The results also indicate that the compression members have a better thermal performance than the flexural members.Research limitations/implicationsNumerical investigations concerning the high-temperature behavior of structural elements are useful. The lack of an experimental setup encourages researchers to perform numerical investigations. In this study, the finite element models were validated with existing finite element models and experimental results.Practical implicationsThe obtained safe limit for the structural members could help to understand their resistance to fire in a real-time scenario. From the safe limit, a suitable design can be preferred while designing the structural members. This could probably save the structure from collapse.Originality/valueThere is a lack of both numerical and experimental research works. In numerical modeling, the research works found in the literature had difficulties in developing a numerical model that satisfactorily represents the structural members under fire, not being able to adequately understand their behavior at high temperatures. None of them considered the influence of the cover thickness under extreme fire and loading conditions. In this paper, this influence was evaluated and discussed.

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Progressive collapse evaluation of RC frames under high-temperature conditions: Experimental and finite element investigations

Cited by 8 publications

References 23 publications

Effect of thermal expansion on three-dimensional reinforced concrete frames under high temperature

Effect of thermal expansion on three-dimensional reinforced concrete frames under high temperature

Transient state analysis of rehabilitated RC beams using finite element modelling and prediction using an artificial neural network

Study on optimum concrete cover thickness in RC beam and columns under high temperature

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