Structural behaviour of FRP reinforced concrete slabs in fire

2020 ◽  
Vol 221 ◽  
pp. 111058 ◽  
Author(s):  
Antonio Bilotta ◽  
Alberto Compagnone ◽  
Laura Esposito ◽  
Emidio Nigro
Keyword(s):  
Reinforced Concrete ◽  
Concrete Slabs ◽  
Structural Behaviour ◽  
Reinforced Concrete Slabs ◽  
In Fire

scholarly journals Deformations of R.C.Circular Slabs in Fire Condition

2018 ◽  
Vol 4 (4) ◽  
pp. 712 ◽  
Author(s):  
Abdelraouf Tawfik Kassem
Keyword(s):  
Finite Element ◽  
Reinforced Concrete ◽  
Slenderness Ratio ◽  
High Surface ◽  
High Surface Area ◽  
Concrete Slabs ◽  
Finite Element Models ◽  
Reinforced Concrete Slabs ◽  
Fire Condition ◽  
In Fire

Reinforced concrete slabs are elements in direct contact with superimposed loads, having high surface area and small thickness. Such a condition makes slabs highly vulnerable to fire conditions. Fire results in exaggerated deformations in reinforced concrete slabs, as a result of material deterioration and thermal induced stresses. The main objective of this paper is to deeply investigate how circular R.C. slabs, of different configurations, behave in fire condition. That objective has been achieved through finite element modelling. Thermal-structural finite element models have been prepared, using "Ansys". Finite element models used solid elements to model both thermal and structural slab behaviour. Structural loads had been applied, representing slab operational loads, then thermal loads were applied in accordance with ISO 843 fire curve. Outputs in the form of deflection profile and edge rotation have been extracted out of the models to present slab deformations. A parametric study has been conducted to figure out the significance of various parameters such as; slab depth, slenderness ratio, load ratio, and opening size; regarding slab deformations. It was found that deformational behaviour differs significantly for slabs of thickness equal or below 100 mm, than slabs of thickness equal or above 200 mm. On the other hand considerable changes in slabs behaviour take place after 30 minutes of fire exposure for slabs of thickness equals or below 100 mm, while such changes delay till 60 minutes for slabs of thickness equals or above 200 mm.

scholarly journals Modelling of reinforced concrete slabs in fire

2018 ◽  
Vol 100 ◽  
pp. 171-185 ◽  
Author(s):  
Yong Wang ◽  
Guanglin Yuan ◽  
Zhaohui Huang ◽  
Junli Lyu ◽  
Qingtao Li ◽  
...  
Keyword(s):  
Reinforced Concrete ◽  
Concrete Slabs ◽  
Reinforced Concrete Slabs ◽  
In Fire

Numerical Simulation of Deformation and Strength of Reinforced Concrete Slabs under Thermal-Mechanical Loads

2007 ◽  
Vol 353-358 ◽  
pp. 2676-2680
Author(s):  
Xiu Shan Sun ◽  
Ying Hua Liu ◽  
Zhang Zhi Cen ◽  
Dong Ping Fang
Keyword(s):  
Reinforced Concrete ◽  
Elevated Temperatures ◽  
Concrete Slabs ◽  
Mechanical Loads ◽  
Simply Supported ◽  
Reinforced Concrete Slabs ◽  
Element Simulation ◽  
Continuous Slab ◽  
In Fire ◽  
Fire Conditions

In this paper, full-scale reinforced concrete slabs are analyzed under thermal-mechanical loads in fire conditions. The rectangular one-way slabs including a simply supported slab and a three-span continuous slab are concerned in the analysis. Finite element simulation is carried out by using the ABAQUS program to evaluate the non-uniform temperature distributions in thickness of the slabs and to analyze the deformation and stress redistribution of the slabs at elevated temperatures. Sequentially coupled thermal and structural analyses are performed to simulate the responses of the slabs in fire conditions. Deformation and strength of the slabs under thermal and mechanical loads are discussed. The numerical results are compared with the experimental ones and good agreements are observed. The analysis results show that the main reinforcement ratio has significant effects on the deformation and strength of the slabs at elevated temperatures and the three-span continuous slab has better performance of fire-resistance than the simply supported slab.

scholarly journals An embedded FE model for modelling reinforced concrete slabs in fire

2008 ◽  
Vol 30 (11) ◽  
pp. 3228-3238 ◽  
Author(s):  
Xinmeng Yu ◽  
Zhaohui Huang
Keyword(s):  
Reinforced Concrete ◽  
Concrete Slabs ◽  
Fe Model ◽  
Reinforced Concrete Slabs ◽  
In Fire

Modelling the Response of Simply-Supported Two-Way Reinforced Concrete Slabs Exposed to Fire

2016 ◽  
Vol 711 ◽  
pp. 588-595
Author(s):  
Emran Baharudin ◽  
Luke Bisby ◽  
Tim Stratford
Keyword(s):  
Reinforced Concrete ◽  
Computational Study ◽  
Concrete Structures ◽  
Structural Response ◽  
Concrete Slabs ◽  
Structural Behaviour ◽  
Fire Engineering ◽  
Reinforced Concrete Slabs ◽  
Structural Fire Engineering ◽  
Fire Codes

The historically good performance of concrete structures in real fires, and the lack of urgent drivers for the concrete industry to support research on the fire performance of concrete structures, means that research on the full frame response of concrete buildings to fires has received much less attention than for steel-framed structures. However, a credible understanding of, and ability to model, the response of concrete structures under fire exposure is crucial to make further progress in the field of structural fire engineering, and to make best use of the flexibility enabled by performance-based fire codes. This paper presents a computational study on the structural behaviour of reinforced concrete slabs during fire tests undertaken by Zhang et al.[16]. The distribution of stresses in the slabs is discussed, as is the need for further research to better understand structural response during fire. Amongst other factors, the assumed tensile strength of the concrete is crucial to accurately predict response. The results corroborate the existing consensus that concrete slabs in real buildings can, in some cases, withstand fires for longer than expected; this is due to mobilisation of membrane actions, amongst other factors.

scholarly journals Investigation on Structural Behavior of Bamboo Reinforced Concrete Slabs under Concentrated Load

2021 ◽  
Vol 50 (1) ◽  
pp. 227-238
Author(s):  
Yanuar Haryanto ◽  
Nanang Gunawan Wariyatno ◽  
Hsuan-Teh Hu ◽  
Ay Lie Han ◽  
Banu Ardi Hidayat
Keyword(s):  
Reinforced Concrete ◽  
Concrete Slab ◽  
Absorption Capacity ◽  
Concrete Slabs ◽  
Structural Behaviour ◽  
Reinforced Concrete Slab ◽  
Concentrated Load ◽  
Steel Reinforced Concrete ◽  
Reinforced Concrete Slabs ◽  
Cracking Pattern

Reinforced concrete is perhaps the most widely used building material in the world. However, the materials used for reinforcement of concrete i.e. steel is quite expensive and scarcely available in the developing world. As a result, bamboo is considered to be a cheaper replacement with high tensile strength. This research investigated the structural behaviour of bamboo-reinforced concrete slabs used for footplate foundation subjected to concentrated load. For this purpose, four different reinforced concrete slab panels were developed and analyzed. The influence of replacing steel with bamboo for the reinforcement of concrete slabs on their structural behaviour was assessed by determining the load-deflection characteristics, the ultimate load, the stiffness, the ductility, the cracking pattern, and the energy absorption capacity. The results showed that in comparison to steel reinforced concrete slabs, the strength of 82% can be acquired by the bamboo reinforced slabs. Furthermore, ductility demonstrated by the two types of specimens was almost equivalent i.e. up to 93%. Those indicated that the structural behaviour demonstrated by bamboo reinforced slabs is quite comparable to that of steel reinforced concrete slabs. Therefore, bamboo can prove to be a promising substitute for steel in concrete reinforcement. Future studies may further examine this opportunity.

Comparison of steel strength retention models for fire exposed concrete slabs

2021 ◽  
Author(s):  
Thomas Thienpont ◽  
Ruben Van Coile ◽  
Robby Caspeele ◽  
Wouter De Corte
Keyword(s):  
Reinforced Concrete ◽  
Construction Materials ◽  
Structural Response ◽  
Bending Moment ◽  
Concrete Slabs ◽  
Structural Behaviour ◽  
Moment Capacity ◽  
Retention Models ◽  
Reinforced Concrete Slabs ◽  
Strength Retention

<p>In structural fire engineering, there is a growing trend towards the use of performance based approaches to evaluate structural behaviour during or after a fire. Consequently, there is a need for an increased level of confidence in properties of construction materials used in these performance based approaches. Both steel and concrete have been experimentally observed to show a dispersal in the value of their respective structural strengths, at room temperature, but more significantly at high temperatures. In this paper the influence of three temperature dependent strength retention models for reinforcement steel on the bending moment capacity of simply supported reinforced concrete slabs exposed to a standardized fire is analysed. The results show that the structural response of reinforced concrete slabs strongly depends on the chosen probabilistic model, thus highlighting the importance of appropriate model selection.</p>

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