Steel fiber reinforced RC beams in pure torsion—Load‐bearing behavior and modified space truss model

Oettel, Vincent

doi:10.1002/suco.202200031

Cited by 4 publications

(3 citation statements)

References 19 publications

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“…The extensive experimental work on the torsional behavior of RC shear walls was limited for pure torsion 7,8 . The previous studies of torsional behavior of RC members were conducted on beams 9–14 . The researchers have not focused on the structural system with the high degree of torsional eccentricity.…”

Section: Introductionmentioning

confidence: 99%

“…7,8 The previous studies of torsional behavior of RC members were conducted on beams. [9][10][11][12][13][14] The researchers have not focused on the structural system with the high degree of torsional eccentricity. However, the behavior of such an asymmetric system cannot be realistically understood without the knowledge of the torsional behavior of a single shear wall under pure torsion.…”

Section: Introductionmentioning

confidence: 99%

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Torsional behavior of hybrid fiber reinforced shear walls an experimental point of view

Bayrak

Kılıç

Maali

et al. 2023

Structural Concrete

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The shear wall system is one of the most commonly used lateral load‐resisting systems in reinforced concrete (RC) high‐rise buildings. The present work is designed to investigate the behavior of reinforced shear walls upon their hybrid fiber ratio, the horizontal reinforcement ratio, and for the reinforcement aspect ratio. For this purpose, nine‐shear walls were manufactured. The same longitudinal reinforcement ratio and the steel and carbon fibers were the main design concept. Withal, the self‐compacting concrete with fiber hybridization was the general perspective for the RC. All the shear wall models were inspected not only for torsion, but also for the energy dissipation capacity, crack propagation, etc. Torsional moment capacity increased, when the hybrid fiber ratio rose up from 0% to 1.0% and then 1.5%. However, this increase was larger in case of increasing the hybrid fiber ratio from 0% to 1.0%. Increasing the hybrid fiber ratio from 1.0% to 1.5% did not result in a performance increase as in the first case. Increasing the fiber ratio from 0% to 1% and from 1% to 1.5% increased the maximum torsional moment between 7.39% and 33.41%. Torsional moment and twist angle capacities increase with the increase in hybrid fiber and horizontal reinforcement ratio and the decrease in the aspect ratio in RC shear walls. Withal, the energy absorption capacity, ductility, and stiffness are also increased as the hybrid fiber ratio. Increasing the hybrid fiber ratio decreased the crack density in the plastic hinge region. Decreasing the aspect ratio from 1.5 to 1.25 increased the dissipation energy capacity between 68.75% and 100%. The addition of 1.0% fiber, a significant increase in the value of ~30% and 53% was achieved stiffness after the crack.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Torsional behavior of hybrid fiber reinforced shear walls an experimental point of view

Bayrak

Kılıç

Maali

et al. 2023

Structural Concrete

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show abstract

“…In addition to the reinforced concrete construction method, in which concrete components are reinforced by steel reinforcement bars, fiber concretes are also increasingly being used. In this case, fibers are added to the concrete during the production process, which prevent or delay the development of microcracks in the hardened state and improve the post-crack behavior of the cracked concrete [2][3][4][5][6]. Due to the high tensile strength and stiffness as well as the corrosion protection provided by the alkaline environment of the concrete, fibers made of steel have been predominantly used for this purpose.…”

Section: Introductionmentioning

confidence: 99%

Fiber Reinforced Concrete with Natural Plant Fibers—Investigations on the Application of Bamboo Fibers in Ultra-High Performance Concrete

Bittner

Oettel²

2022

Sustainability

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Natural plant fibers represent a sustainable alternative to conventional fiber reinforcement materials in cementitious materials due to their suitable mechanical properties, cost-effective availability and principle carbon neutrality. Due to its high tensile strength and stiffness as well as its worldwide distribution along with rapid growth, bamboo offers itself in particular as a plant fiber source. In experimental studies on concrete beams reinforced with plant fibers, a positive influence of the fibers on the flexural behavior was observed. However, the load-bearing effect of the fibers was limited by the poor bond, which can be attributed, among other things, to the swelling behavior of the fibers. In addition, the plant fibers degrade in the alkaline environment of many cementitious building materials. In order to improve the bond and to limit the alkalinity and to increase the durability, the use of ultra-high performance concrete (UHPC) offers itself. Since no tests have been carried out, investigations on the flexural behavior of UHPC with bamboo fibers were carried out at the Institute of Concrete Construction of Leibniz University Hannover. The test results show a significantly improved load-bearing behavior of the fibers and the enormous potential of the combination of UHPC and bamboo fibers.

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Enhancing torsional performance of reinforced concrete beams: a comparative analysis of shear reinforcement strategies

Mahzuz,

Nury,

Ahmed

et al. 2024

Discov Civ Eng

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Torsion failure poses a critical threat to the structural integrity of reinforced concrete, particularly in seismic hazard zones. This study aims to overcome this difficulty by conducting a thorough examination of the torsional characteristics of Reinforced Cement Concrete (RCC) beams. This study examined the torsional characteristics of various RCC beams by utilizing different configurations of shear reinforcements. The objective was to determine an effective alternative shear reinforcement configuration in comparison to the traditional Non-welded Rectangular Stirrup Beam (NRSB). Comparing three types of beams, namely NRSB, Welded Rectangular Stirrup Beam (WRSB), and Welded Warren Truss Beam (WWTB), a novel warren truss-shaped shear reinforcement was introduced. All beams were constructed with consistent dimensions of concrete and uniform weights of reinforcement, including 16 mm bars for the top and bottom longitudinal reinforcement and 10 mm bars as shear reinforcements. Two separate concrete mix ratios were evaluated, specifically 1:1.5:1.5 and 1:2.5:2.5 (by volume) respectively. Theoretical calculations based on elastic theory were used to determine the angle of twist for each beam. The torsional moment resistance of WRSB and WWTB was found to be 4.4% and 1% higher, respectively, compared to the traditional NRSB, while using a mix ratio of 1:1.5:1.5. Regarding the alternative mixture ratio, the torsional moment for WRSB was 10% more, whereas for WWTB it was 2.4% less. As a result, the WRSB specimens exhibited the highest torsional moment for both mix ratios, but the NRSB and WWTB specimens had comparable values.

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Steel fiber reinforced RC beams in pure torsion—Load‐bearing behavior and modified space truss model

Cited by 4 publications

References 19 publications

Torsional behavior of hybrid fiber reinforced shear walls an experimental point of view

Torsional behavior of hybrid fiber reinforced shear walls an experimental point of view

Fiber Reinforced Concrete with Natural Plant Fibers—Investigations on the Application of Bamboo Fibers in Ultra-High Performance Concrete

Enhancing torsional performance of reinforced concrete beams: a comparative analysis of shear reinforcement strategies

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