Behavior of RC Shallow and Deep Beams with Openings Via the Strut-and-Tie Model Method and Nonlinear Finite Element

This research presents an analytical study to verify the experimental study of new models for reinforcing deep beams with different shear openings, in addition to proposing a formula for calculating the shear capacity of such beams. The results of the analytical study demonstrated the efficiency of the proposed nonlinear finite element (NLFE) model by close matching the carrying capacity of the tested beams and their comparative analyzed by the ABAQUS program. The analytical program included representing a 14specimens study with two different concrete strength and three different sizes of shear openings. The comparison revealed the accuracy of the analytical model in the representation of solid deep beams and deep beams with shear openings; including predicting the fracture load, the behavior of these beams, in addition to the crack pattern and stresses of the proposed reinforcement configurations. Using both of ABAQUS program and specifications of the ACI 318-14 (ACI Committee 318, 2014), a parametric study was developed to investigate the relationship between shear strength of deep beams with different sizes of shear openings and shear opening ratio to the total area of shear zone. Based on this parametric study, a dimensionless equation for calculating the shear strength of deep beams was obtained, which can be utilized in the design of such beams having same shear span-to-depth ratio and opening maximum size of 0.15 relative to shear zone.

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“…El-Demerdash et al [5] made verifications on previous experimental results by FEA using ANSYS program.…”

Section: Introductionmentioning

confidence: 87%

Proposed formula for design of deep beams with shear openings

et al. 2018

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“…El-Demerdash [12] verified experimental results through FEA using ANSYS program, enhancing understanding through computational analysis.…”

Section: Introductionmentioning

confidence: 77%

An Advanced Formulation for Rehabilitating Shear Strength in Deep Beams with Shear Openings through Integration of Varied Steel Configurations for Utility Provisions

Prachi G. Shah, Nirpex A. Patel, Vijay R. Panchal

2023

tjjpt

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In the contemporary urban landscape, rapid technological advancements necessitate adaptations in industrial and residential structures to accommodate new utilities such as ducts, pipes, and passages. This study focuses on formulating a design methodology and aid for recovering shear capacity losses resulting from openings in existing solid deep beams. A novel design approach involves the implementation of steel elementary configurations around the openings in deep beams, enhancing their shear resistance. The study employs a systematic investigation, integrating simulation through the ABAQUS program, to assess the effectiveness of the proposed steel configurations in restoring shear capacity. The research explores three distinct steel configurations, emphasizing the synergy between concrete and steel materials. Concrete Damage Plasticity models, incorporated within ABAQUS, enable detailed quasi-static analysis to unravel the intricate behaviour of deep beams subjected to shear openings and strengthened with proposed steel formations. Specifically, a deep beam model featuring a combination of a full-length steel plate welded with a steel cylinder around the opening (EDSBPD) exhibited full capacity restoration, achieving an efficiency of 1.0064 compared to solid deep beams. Leveraging ABAQUS simulations and adhering to ACI 318-14 specifications, a parametric study was conducted to investigate the EDSBPD for design assistance. This study led to the development of a dimensionless equation that calculates the shear strength of deep beams, accounting for the impact of the thickness-to-width ratio of the steel configuration around the opening. This equation provides a valuable tool for incorporating openings into solid deep beams without compromising shear strength.

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“…Consequently, the investigation and project of a beam with small openings possibly take the comparable course of action as in solid beam. Small openings are, thus, defined as openings which are small enough and situated in such approach that a strut-tie model (STM) is capable of jumping over the openings without causing extra vertical or horizontal struts in the chords above and below the openings [15]. Large openings can be defined as an opening that requires additional vertical and horizontal struts in the chords above and below the opening.…”

Section: Opening Classificationmentioning

confidence: 99%

Experimental Study of Replacement the Tension Reinforcing Bars in Concrete Beams by Steel Pipes

Al-Yassri¹,

Al-Khekany²,

Abbas³

2018

IJET

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Structures designed with reinforced concrete beams are used extensively in construction projects because of their functional and economic features. In this research, tested concrete beams were cast and reinforced with small diameter steel pipes and /or steel bars as flexural reinforcement to study the effect of this configuration of reinforcement on the structural behavior of reinforced concrete beams. The idea of this research involves performing and testing of four reinforced concrete beams reinforced by small diameter steel pipes with different percentages of replacement with traditional steel bars (0%, 33%, 66% and 100%). The experimental results showed that using of steel pipes reduces the flexural capacity by (2.7, 18.3, 37.5%) if compared with traditional steel bar according to the replacement percentages of (33%, 66%, and 100%) respectively. Moreover, the stiffness of beams reinforced with steel pipes (fully or partially) decreased as a result of the difference in the mechanical properties between steel bar and the steel pipe and also, the bond strength reduction between the smooth steel pipe and surrounded concrete.

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Behavior of RC Shallow and Deep Beams with Openings Via the Strut-and-Tie Model Method and Nonlinear Finite Element

Cited by 12 publications

References 7 publications

Proposed formula for design of deep beams with shear openings

Proposed formula for design of deep beams with shear openings

An Advanced Formulation for Rehabilitating Shear Strength in Deep Beams with Shear Openings through Integration of Varied Steel Configurations for Utility Provisions

Experimental Study of Replacement the Tension Reinforcing Bars in Concrete Beams by Steel Pipes

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