A modified layered-section method for responses of fire-damaged reinforced concrete beams under static and blast loads

Pan, Liuzhan; Chen, Li; Fang, Qin; Zhai, Chaochen; Pan, Teng

doi:10.1177/2041419616658384

Cited by 11 publications

(3 citation statements)

References 23 publications

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“…Few research works are available in the literature about the evaluation of the concrete impact strength after high temperature exposure, most of which investigate high-strain rate impact tests and blast tests [27][28][29][30][31], while a very limited number of works were found on low-velocity impact tests on reinforced concrete members [18,32]. Most of these works developed numerical analyses to evaluate the dual effect of high temperature and high-strain rate impacts on reinforced concrete and composite structural members [33][34][35].…”

Section: Introductionmentioning

confidence: 99%

Residual Repeated Impact Strength of Concrete Exposed to Elevated Temperatures

et al. 2021

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Portland cement concrete is known to have good fire resistance; however, its strength would be degraded after exposure to the temperatures of fire. Repeated low-velocity impacts are a type of probable accidental load in many types of structures. Although there is a rich body of literature on the residual mechanical properties of concrete after high temperature exposure, the residual repeated impact performance of concrete has still not been well explored. For this purpose, an experimental study was conducted in this work to evaluate the effect of high temperatures on the repeated impact strength of normal strength concrete. Seven identical concrete patches with six disc specimens each were cast and tested using the ACI 544-2R repeated impact setup at ambient temperature and after exposure to 100, 200, 300, 400, 500 and 500 °C. Similarly, six cubes and six prisms from each patch were used to evaluate the residual compressive and flexural strengths at the same conditions. Additionally, the scattering of the impact strength results was examined using three methods of the Weibull distribution, and the results are presented in terms of reliability. The test results show that the cracking and failure impact numbers of specimens heated to 100 °C reduced slightly by only 2.4 and 3.5%, respectively, while heating to higher temperatures deteriorated the impact resistance much faster than the compressive and flexural strengths. The percentage reduction in impact resistance at 600 °C was generally higher than 96%. It was also found that the deduction trend of the impact strength with temperature is more related to that of the flexural strength than the compressive strength. The test results also show that, within the limits of the adopted concrete type and conducted tests, the strength reduction after high temperature exposure is related to the percentage weight loss.

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Section: Introductionmentioning

confidence: 99%

Residual Repeated Impact Strength of Concrete Exposed to Elevated Temperatures

et al. 2021

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“…An example of the second situation is the gas explosion in a building, which is followed by a fire provoked by the explosion. Compared to studies analysing the behaviour of concrete structures subjected to explosions, experimental and numerical studies (even simplified ones) on reinforced concrete structures exposed to the combined effects of fire and blast are much more limited [93][94][95][96][97][98][99].…”

Section: Combined Effects Of Explosions and Firementioning

confidence: 99%

State-of-the-art on Impact and Explosion behaviour of concrete structures –Rilem Committee TC 288 Impact and Explosion

Prisco,

Cadoni,

Caldentey

et al. 2024

Preprint

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Extreme loads can arise from accidents such as vehicle collisions or airplane crashes, as well as deliberate acts of terrorism or military attacks involving blasts and fragmentation. Blast overpressure can also occur accidentally, for example, from explosions of hazardous materials such as gas. Distinguishing between accidental and deliberate loads is crucial for designing appropriate protection measures. The repercussions of extreme loading events can be devastating, leading to injuries, loss of life, economic setbacks, and significant social disruption. These consequences result not only from the direct effects of impacts or explosions but also from secondary factors such as structural collapse, which is particularly concerning due to its potential for widespread devastation and substantial losses. Efforts to enhance the protection of concrete structures have focused on understanding the properties of construction materials and how structures respond to impact and blast loads. This document presents a comprehensive overview of RILEM TC 288 “Impact and Explosion,” aiming to provide essential guidance for designing concrete structures to withstand extreme dynamic loads. This emphasizes the importance of a thorough understanding and accurate modelling of loading scenarios and material behaviour. By implementing the strategies outlined in this document, engineers can enhance the safety and resilience of structures facing such challenges.

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“…Significant attention has been directed toward the safety of engineering structures under blast loads. In particular, the mechanical response of reinforced concrete (RC) beams, plates, columns, and other main load-bearing structures subject to blast loads has received considerable research attention (Dennis et al, 2002; Pan et al, 2016; Rao et al, 2018; Rodriguez et al, 2011; Sasani and Sagiroglu, 2008; Shi et al, 2010). Due to the great difficulty and high cost of explosive tests, scholars typically simplify explosive loads into equivalent static loads, and then conduct quasi-static load tests on RC structures or components.…”

Section: Introductionmentioning

confidence: 99%

Uniform loading on the reinforced concrete beam produced by the specific cylinder-shaped rubber bags fully filled with air or water

Chen

Fang

et al. 2020

Advances in Structural Engineering

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The bending behavior of reinforced concrete beams under uniform pressure is critical for the research of the blast-resistance performance of structural components under explosive loads. In this study, a bending test of five reinforced concrete beams with the dimensions of 200 mm (width) × 200 mm (depth) × 2500 mm (length) under uniform load produced by a specific cylinder-shaped rubber bag filled with air or water was conducted to investigate their flexural performances. An air bag load was applied to three of the reinforced concrete beams, a water bag load was applied to one reinforced concrete beam, and the remainder beam was subjected to the 4-point bending load. The experimental results highlighted that the air bag and water bag loading methods can be used to effectively apply uniform loads to reinforced concrete beams. Moreover, the stiffness of the air bag was improved by 123% in accordance with the initial pressure increases from 0.15 to 0.45 MPa. In addition, a finite element model of the test loading system was established using ABAQUS/Standard software. Moreover, the critical factors of the air bag loading method were analyzed using the numerical model. The calculated results were found to be in good agreement with the test data. The established finite element model can therefore be used to accurately simulate the action performances of the uniform loading technique using rubber bags filled with air or water.

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A modified layered-section method for responses of fire-damaged reinforced concrete beams under static and blast loads

Cited by 11 publications

References 23 publications

Residual Repeated Impact Strength of Concrete Exposed to Elevated Temperatures

Residual Repeated Impact Strength of Concrete Exposed to Elevated Temperatures

State-of-the-art on Impact and Explosion behaviour of concrete structures –Rilem Committee TC 288 Impact and Explosion

Uniform loading on the reinforced concrete beam produced by the specific cylinder-shaped rubber bags fully filled with air or water

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