Fire Resistance Investigation of Simple Supported RC Beams with Varying Reinforcement Configurations

Song, Yamin; Chen, Fu; Liang, Shuting; Yin, A; Dang, Longji

doi:10.1155/2019/8625360

Cited by 13 publications

(13 citation statements)

References 19 publications

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“…A numerical procedure to predict the mechanical behavior of fire-exposed reinforced concrete beams is also shown in Sun et al 4 In this study, the authors capture the thermal behavior through a two-dimensional finite element model, while a one-dimensional numerical model is formulated to simulate the mechanical response of beams under increasing loads. The authors point out that few elements are used in the analysis and that the numerical results are consistent with the experimental test data, which demonstrates the model's ability to effi- More recently, six full-scale simply supported reinforced concrete beams were designed according to the strong bending and weak shearing principle by Song et al 5 to investigate three-sided exposed fire resistance behavior. One beam was analyzed at room temperature while the other five were exposed to high temperature.…”

Section: Introductionmentioning

confidence: 70%

Thermo-structural analysis of reinforced concrete beams

et al. 2019

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The objective of this study is to simulate the behavior of reinforced concrete beams in fire situation. In order to achieve this objective, advanced numerical formulations were developed, implemented and evaluated. When exposed to high temperatures, the properties of the material deteriorate, resulting in the loss of strength and stiffness. To achieve the goal, two new modules within the Computational System for Advanced Structural Analysis were created: Fire Analysis and Fire Structural Analysis. The first one aims to determine the temperature field in the cross section of structural elements through thermal analysis by using the Finite Element Method (FEM). The second was designed to perform the second-order inelastic analysis of structures under fire using FEM formulations based on the Refined Plastic Hinge Method coupled with the Strain Compatibility Method. The results obtained of the nonlinear analyses of two reinforced concrete beams under high temperature were compared with the numerical and experimental solutions available in literature and were highly satisfactory. These results also showed that the proposed numerical approach can be used to study the progressive collapse of other reinforced concrete structures in fire situation and extended to the numerical analysis of composite structures under fire condition.

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Section: Introductionmentioning

confidence: 70%

Thermo-structural analysis of reinforced concrete beams

et al. 2019

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“…So, it is necessary to study the actions of beams after high-temperature effect (Kong, 2013; Ryu et al , 2018). Different reinforcement configurations with different faces of fire exposure studies give a better understanding of their behavior (Song et al , 2019). Cross-section of the member, cover thickness and material quality also play a significant role in the thermal behavior of members (Kang et al , 2016; El-Hawary et al , 1997).…”

Section: Reinforced Concrete Elementsmentioning

confidence: 99%

A review on research of fire-induced progressive collapse on structures

Vishal

Satyanarayanan

2021

JSFE

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Purpose This paper delineates a literature review on fire-induced progressive collapse on structures and the effect of high temperature on structures and elements. After the occurrences of fire in the World Trade Center in the USA, the researchers started concentrating on the progressive collapse that happens due to high temperature. Currently, most of the researchers are working on fire-induced progressive collapse on structures using high-temperature behavior on materials which are used for construction. The researchers have been doing an intensive study to find a better strategy to prevent the building from structural fire damage or collapse with available codes and guidelines throughout the world. This paper aims to provide a better understanding and analytical solutions on the basis of the recent works done by researchers in fire-induced progressive collapse and methods adopted to find the collapse mechanism. Design/methodology/approach This paper is written by studying different literature papers of 109 related to progressive collapse on structures and fire-induced progressive collapse. Findings The behavior of structures due to high temperature and collapse conditions due to fire in different scenarios is identified. Originality/value This paper fulfills an identified need to study how the structure can withstand high-temperature conditions in our day-to-day lives.

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“…The structural-thermal interaction could generate substantial thermal-induced mechanical stresses that is not considered in design in shear-critical regions, forcing elements to fail in shear. Besides, an experimental programme conducted by Song et al (2019) showed that shear failure occurred in shallow RC beams under elevated temperatures as shown in Figure 1-3. Shear failure is generally catastrophic and sudden.…”

Section: Strut-and-tie Modelling Of Rc Short and Deep Beams At Elevat...mentioning

confidence: 99%

“…Figure 1-3 Shear failure of a shallow beam at fire condition (Song et al 2019) Most structural fire design codes (AS 3600 2001, EN 1992-1-2 2004, ACI 216.1 2014 and guidelines mainly evaluate the fire resistance of RC members based on flexural capacity, rather than shear capacity, at fire condition. Only EN 1992-1-2 (2004 recommends using the simplified design approach meant for flexural capacity as a basis to determine shear resistance.…”

Section: Strut-and-tie Modelling Of Rc Short and Deep Beams At Elevat...mentioning

confidence: 99%

“…Up to now, extensive research work has been conducted on flexural response of RC members subjected to fire (Kumar andKumar 2003, Shi et al 2004, Dwaikat and Chapter 1: Introduction 5 Kodur 2009, Choi and Shin 2011, Albuquerque et al 2018, Hou et al 2019. However, to the author's best knowledge, very few publications can be found assessing shear behaviour of RC members at elevated temperatures (Krampf 1979, Ellingwood and Lin 1991, Bamonte et al 2017, Song et al 2019. Both Krampf (1979) and Song et al (2019) observed shear failure in their test programmes.…”

Section: 50) At Fire Conditionmentioning

confidence: 99%

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Consistent strut-and-tie modelling of deep and short beams and hollow-core slabs at ambient and elevated temperatures

Fan¹

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Strut-and-tie model (STM) has been widely incorporated in different codes of practice due to its accuracy and consistency in designing Discontinuity-regions.Discontinuity-regions refer to regions where the strain distribution is significantly non-linear and traditional shallow beam theory does not apply. Application of STM to Discontinuity-regions or members comprising entirely of Discontinuity-regions, such as reinforced concrete (RC) deep and short beams, corbels, beam-column joints, etc., under ambient condition has been well verified by different researchers.However, the feasibility of applying STM to deep and short beams subjected to fires or to prestressed precast concrete hollow-core (PCHC) slabs with non-uniform cross-sectional properties and no web reinforcement at ambient temperature have hardly been investigated. Besides, there is a lack of experimental test results of heated short beams with/without axial restraint and fire-exposed deep beams under unequal and/or unsymmetrical loading arrangement. Therefore, experimental data is needed for verification of the proposed STM approaches for deep and short beams at high temperatures. In addition, there are challenges in selecting an optimal STM for RC deep beams with variations in load configurations such as the load magnitude, equality, symmetry and load combinations. Hence, research is needed to develop a direct approach for determining a suitable STM geometry to simplify the analysis procedure for engineers.To bridge the gaps, the present research programme is conducted to:(1) Examine experimentally structural fire behaviour of axially-restrained and unrestrained short beams, with shear-span-to-effective-depth (a/d) ratio ranging from 1.50 to 2.50, followed by the development of a general STM-based approach for simulating the response of short beams subjected to fire.(2) Conduct analytical and experimental studies on RC deep beams under combined effects of load inequality, load asymmetry, and elevated temperatures.(3) Develop and validate a refined and direct STM approach for both symmetricallyand unsymmetrically-loaded deep beams at ambient temperature. Summary viii (4) Establish and verify a STM approach to predict the web-shear capacity of PCHC slabs at ambient temperature.To achieve the research objectives, two series of tests were conducted on seven short beams (Series I in Chapter 3) and six deep beams under elevated temperatures (Series II in Chapter 4). The first series was to investigate experimentally the effects of a/d ratio and thermal-induced axial restraint on structural fire behaviour of short beams, while Series II was for unsymmetrically-loaded RC deep beams at elevated temperatures. The experimental data were utilised to establish proposed STM approaches for assessing the shear resistances and fire durations of deep and short beams when exposed to fires. Based on the experimental and analytical studies, it was found that: (i) The presence of elevated temperatures altered failure model of deep and short beams to a less brittle failure m...

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Fire Resistance Investigation of Simple Supported RC Beams with Varying Reinforcement Configurations

Cited by 13 publications

References 19 publications

Thermo-structural analysis of reinforced concrete beams

Thermo-structural analysis of reinforced concrete beams

A review on research of fire-induced progressive collapse on structures

Consistent strut-and-tie modelling of deep and short beams and hollow-core slabs at ambient and elevated temperatures

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