3D numerical analysis of reinforced concrete beams exposed to elevated temperature

Ožbolt, Joško; Bošnjak, Josipa; Periškić, Goran; Sharma, Akanshu

doi:10.1016/j.engstruct.2012.11.030

Cited by 88 publications

(42 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A thermo-mechanical model [7,12,15,16] of the reinforced concrete beam, loaded at the mid span of the girder, was developed for the purpose of this testing, using the threedimensional (3D) finite element method. The thermo-mechanical model is required so as to simulate response of the loadbearing structure after degradation of mechanical properties due to high temperature effects.…”

Section: Rc Beam Modellingmentioning

confidence: 99%

“…Although it is known that, in comparison to other materials, reinforced concrete structures exhibit a relatively good behaviour during fire or high temperatures, it should be observed that, after the effects of such load, changes in the initial characteristics of material occur, i.e. significant features of structural materials are affected [6,7]. The occurrence of these degradation mechanisms causes damage to the load-bearing structure during and after fire, which results in a reduced bearing capacity of the reinforced concrete structure [8], as well as in mechanical and temperature damage to concrete [9,10].…”

Section: Introductionmentioning

confidence: 99%

“…[7], where a similar static model of reinforced concrete beam, loaded at four points by bending, was studied. Unlike the concept presented in paper [7], the objective of this paper is to study the effect of different reinforcing methods on the loadbearing capacity of structures after previous simulation of fire activity and material degradation as a result of high temperature. The modelling of all RC beam models presented in this paper, i.e.…”

Section: Introductionmentioning

confidence: 99%

“…The finite-element computer programme MASA is used for non linear calculation and analysis of three dimensional (3D) finite elements of structures made of quasi-fragile materials, such as concrete, stone, ceramics, etc. Although different types of materials can be analysed, the programme is mostly intended for non-linear analysis of concrete and reinforced concrete in the framework of the continuum mechanics theory, taking into account damage of material [7,12,13,14], e.g. cracking of concrete or flow of reinforcement.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

The influence of continuing reinforcement on the load capacity of a RC beam previously exposed to high temperatures

Lakušić¹

2017

JCE

View full text Add to dashboard Cite

The influence of continuing reinforcement on the load capacity of a RC beam previously exposed to high temperatures The paper describes the RC beam model development and the influence exerted by the main longitudinal reinforcement overlapping and transverse reinforcement (ties) on the bearing capacity of a RC load bearing structure for several cases of load, with an emphasis on the influence of high temperatures. Several RC beam models are made and relevant calculations and results are presented, which show the influence of the reinforcement method on the bearing capacity of structures, i.e. of the mainreinforcement continuing as related to the one-part reinforcement, as well as the influence of transverse reinforcement (ties). Utjecaj nastavljanja armature na nosivost ab grede prethodno izložene djelovanju visokih temperatura U radu je opisana izrada modela ab grede i istraživanje utjecaja preklapanja glavne uzdužne armature i utjecaj poprečne armature (spona) na nosivost ab nosive konstrukcije za više slučajeva opterećenja, s naglaskom na utjecaj djelovanja visokih temperatura. Napravljeno je više modela ab grede te su prikazani proračuni i rezultati iz kojih je vidljiv utjecaj načina armiranja na nosivost konstrukcije, odnosno nastavljanja glavne armature u odnosu na armaturu iz jednog dijela, kao i utjecaj poprečne armature (spona).

show abstract

Section: Rc Beam Modellingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

The influence of continuing reinforcement on the load capacity of a RC beam previously exposed to high temperatures

Lakušić¹

2017

JCE

View full text Add to dashboard Cite

show abstract

“…However, the cooling phase after heating was not considered in the analysis because the main emphasis of these studies was the fire resistance rating of RC beams during fire exposure. A limited number of analytical studies on the residual flexural behavior of RC beams after exposure to fire has been found [11][12][13][14]. Ožbolt et al [14] employed a transient three-dimensional (3D) thermo-mechanical model that was implemented into a three-dimensional (3D) finite element code for predicting the temperature profiles inside the RC sections and load-deflection behaviour of the structural members subjected to thermal loads, at high temperatures or after cooling.…”

Section: Introductionmentioning

confidence: 99%

Thermal Analysis for Peak Temperature Distribution in Reinforced Concrete Beams after Exposure to ASTM E119 Standard Fire

Tiantongnukul¹,

Lenwari²

2017

View full text Add to dashboard Cite

Abstract.To assess the post-fire or residual strength of fire-damaged reinforced concrete (RC) members, the most detrimental or peak temperature distribution within the members should be perceived. For RC beams, the residual flexural response is strongly influenced by the peak temperature experienced by the steel reinforcements. This paper presents a simplified two-dimensional (2D) nonlinear transient thermal analysis for the peak temperature distribution in RC beams using the finite element method. In the analysis, the thermal loading for heating was the ASTM E119 standard fire. After heating, a linear decrease in temperature was assumed for cooling. Three-sided fire exposure was assumed for rectangular RC beams. The analysis was used to investigate the effects of the heating period (1-4 h), cooling period (1-4 h), concrete cover thickness (30-50 mm) and aggregate type (carbonate or siliceous aggregates) on the peak steel temperature and delayed time (time to attain the peak temperature after heating). The numerical results showed that the temperature inside the beam section continues to rise after heating. The increases in steel temperature after heating and delayed time are influenced by the heating period, cooling period, location of steel reinforcement, and aggregate type. Such increase is significant for the beam with a thick concrete covering subjected to a short heating period followed by a long cooling period. At the longest (4 h) cooling and shortest (1 h) heating periods, the increases in steel temperature after heating in both carbonate and siliceous concrete beams are approximately 35, 50 and 75% for concrete cover thicknesses of 30, 40, and 50 mm, respectively. The carbonate concrete beams are more vulnerable to fire damage than siliceous ones when subjected to long heating and cooling periods.

show abstract

Enhancing fire‐resistant design of reinforced concrete beams by investigating the influence of reliability‐based analysis

Szép,

Movahedi Rad,

Habashneh

2024

Engineering Reports

View full text Add to dashboard Cite

A depth investigation into the impact of high temperatures on the load‐bearing capacity of reinforced concrete beams in the case of probabilistic design is presented in this paper, employing advanced finite element analysis techniques. This study addresses a critical knowledge gap in the design of fire‐resistant concrete structures, with specific emphasis on the function of concrete cover. The research aims to enhance the overall safety and reliability of concrete buildings under high temperature conditions by providing valuable insights into the behavior of reinforced concrete beams under thermal loading. The analysis incorporates reliability‐based modeling to account for uncertainties in temperature distribution within the beams. A validated finite element model is employed to simulate the performance of reinforced concrete beams at elevated temperatures. By considering various concrete cover thicknesses and heat distribution scenarios, the influence of these factors on the load‐bearing capacity is thoroughly examined. The results underscore the importance of augmenting the concrete cover to enhance the load‐carrying capacity of the beams. Furthermore, the study examines the impact of temperature distribution uncertainties, unveiling diverse load capacities associated with different configurations of concrete cover.

show abstract

3D numerical analysis of reinforced concrete beams exposed to elevated temperature

Cited by 88 publications

References 10 publications

The influence of continuing reinforcement on the load capacity of a RC beam previously exposed to high temperatures

The influence of continuing reinforcement on the load capacity of a RC beam previously exposed to high temperatures

Thermal Analysis for Peak Temperature Distribution in Reinforced Concrete Beams after Exposure to ASTM E119 Standard Fire

Enhancing fire‐resistant design of reinforced concrete beams by investigating the influence of reliability‐based analysis

Contact Info

Product

Resources

About