scholarly journals Strengthening the Structural Behavior of Web Openings in RC Deep Beam Using CFRP

Materials ◽  
2020 ◽  
Vol 13 (12) ◽  
pp. 2804
Author(s):  
Nurul Izzati Rahim ◽  
Bashar S. Mohammed ◽  
Amin Al-Fakih ◽  
M. M. A. Wahab ◽  
M. S. Liew ◽  
...  
Keyword(s):  
Reinforced Concrete ◽  
Shear Failure ◽  
Load Carriage ◽  
Structural Behavior ◽  
Deep Beam ◽  
Deep Beams ◽  
Web Openings ◽  
Bending Load ◽  
Cfrp Composite ◽  
Cracking Pattern

Deep beams are more susceptible to shear failure, and therefore reparation is a crucial for structural reinforcements. Shear failure is structural concrete failure in nature. It generally occurs without warning; however, it is acceptable for the beam to fail in bending but not in shear. The experimental study presented the structural behavior of the deep beams of reinforced concrete (RC) that reinforces the web openings with externally connected carbon fiber reinforced polymer (CFRP) composite in the shear zone. The structural behavior includes a failure mode, and cracking pattern, load deflection responses, stress concentration and the reinforcement factor were investigated. A total of nine reinforced concrete deep beams with openings strengthened with CFRP and one control beam without an opening have been cast and tested under static four-point bending load till failure. The experimental results showed that the increase the size of the opening causes an increase in the shear strength reduction by up to 30%. Therefore, the larger the openings, the lower the capability of load carriage, in addition to an increase in the number of CFRP layers that could enhance the load carrying capacity. Consequently, utilization of the CFRP layer wrapping technique strengthened the shear behavior of the reinforced concrete deep beams from about 10% to 40%. It was concluded that the most effective number of CFRP layers for the deep beam with opening sizes of 150 mm and 200 mm were two layers and three layers, respectively.

THE EFFECT OF REINFORCING ARRANGEMENT ON THE BEHAVIOR OF REINFORCED CONCRETE FLANGED DEEP BEAMS WITH WEB OPENINGS

2016 ◽  
Vol 3 (1) ◽  
Author(s):  
Abbas Hilo Ali
Keyword(s):  
Reinforced Concrete ◽  
Crack Width ◽  
Experimental Tests ◽  
Structural Behavior ◽  
Repeated Loading ◽  
Deep Beams ◽  
Web Openings ◽  
Simply Supported ◽  
Web Opening ◽  
Better Than

The objective of the work is to investigate the structural behavior of reinforced concrete flanged deep beams with web openings under repeated loading through experimental tests which were carried out on simply supported T-beams , subject to two point loads. This work deals with the results of experimental work with three test specimens with square opening 25% of web depth at mid high through critical shear path. The effect of steel reinforcement arrangement for web opening is investigated. The experimental tests of sections under repeated loading showed that reinforcement of web opening increased the cracking and ultimate loads. It is observed that reinforcement for opening reduced the deflection and the crack width. The inclined reinforcement results are better than orthogonal.

scholarly journals Effect of Size and Location of Square Web Openings on the Entire Behavior of Reinforced Concrete Deep Beams

2019 ◽  
Vol 5 (1) ◽  
pp. 209 ◽  
Author(s):  
Waleed A. Jasim ◽  
Abbas A. Allawi ◽  
Nazar Kamil Ali Oukaili
Keyword(s):  
Finite Element ◽  
Reinforced Concrete ◽  
Carrying Capacity ◽  
Shear Capacity ◽  
Load Carrying Capacity ◽  
Deep Beam ◽  
Deep Beams ◽  
Web Openings ◽  
Shear Span ◽  
Load Carrying

This paper presents an experimental and numerical study which was carried out to examine the influence of the size and the layout of the web openings on the load carrying capacity and the serviceability of reinforced concrete deep beams. Five full-scale simply supported reinforced concrete deep beams with two large web openings created in shear regions were tested up to failure. The shear span to overall depth ratio was (1.1). Square openings were located symmetrically relative to the midspan section either at the midpoint or at the interior boundaries of the shear span. Two different side dimensions for the square openings were considered, mainly, (200) mm and (230) mm. The strength results proved that the shear capacity of the deep beam is governed by the size and location of web openings. The experimental results indicated that the reduction of the shear capacity may reach (66%). ABAQUS finite element software program was used for simulation and analysis. Numerical analyses provided un-conservative estimates for deep beam load carrying capacity in the range between (5-21%). However, the maximum scatter of the finite element method predictions for first diagonal and first flexural cracking loads was not exceeding (17%). Also, at service load the numerical of midspan deflection was greater than the experimental values by (9-18%).

THE BEHAVIOR OF REINFORCED-CONCRETE DEEP BEAMS WITH WEB OPENINGS UNDER REPEATED LOADS

2014 ◽  
Vol 1 (1) ◽  
Author(s):  
Anis Abdul Khuder Mohamad-Ali ◽  
Abbas Hilo Ali
Keyword(s):  
Reinforced Concrete ◽  
Ultimate Load ◽  
Structural Behavior ◽  
Repeated Loading ◽  
Reinforcement Effect ◽  
Deep Beams ◽  
Web Openings ◽  
Simply Supported ◽  
Web Reinforcement ◽  
The Web

The objective of the work is to investigate the structural behavior of reinforced-concrete flanged deep beams with web openings, particularly in regards to the web reinforcement effect. This paper reports on experimental work on five test specimens, with square openings 25% of web depth at mid-height, through a critical shear path, subjected to repeated loading on simply-supported T-beams with two-point loads. Results showed that increasing the ratio of reinforcement of web increased the cracking and ultimate load, while increasing the vertical and horizontal reinforcement of web gives better results. Thus an inclined reinforcing of web gives higher ultimate load.

scholarly journals Finite element analysis of reinforced concrete deep beam with large opening

2021 ◽  
Vol 10 (1) ◽  
Author(s):  
Elsayed Ismail ◽  
Mohamed S. Issa ◽  
Khaled Elbadry
Keyword(s):  
Finite Element ◽  
Reinforced Concrete ◽  
Concrete Beams ◽  
Load Capacity ◽  
Reinforced Concrete Beams ◽  
The Other ◽  
Deep Beam ◽  
Web Openings ◽  
Design Load ◽  
Large Opening

Abstract Background A series of nonlinear finite element (FE) analyses was performed to evaluate the different design approaches available in the literature for design of reinforced concrete deep beam with large opening. Three finite element models were developed and analyzed using the computer software ATENA. The three FE models of the deep beams were made for details based on three different design approaches: (Kong, F.K. and Sharp, G.R., Magazine of Concrete Res_30:89-95, 1978), (Mansur, M. A., Design of reinforced concrete beams with web openings, 2006), and Strut and Tie method (STM) as per ACI 318-14 (ACI318 Committee, Building Code Requirements for Structural Concrete (ACI318-14), 2014). Results from the FE analyses were compared with the three approaches to evaluate the effect of different reinforcement details on the structural behavior of transfer deep beam with large opening. Results The service load deflection is the same for the three models. The stiffnesses of the designs of (Mansur, M. A., Design of reinforced concrete beams with web openings, 2006) and STM reduce at a load higher than the ultimate design load while the (Kong, F.K. and Sharp, G.R., Magazine of Concrete Res_30:89-95, 1978) reduces stiffness at a load close to the ultimate design load. The deep beam designed according to (Mansur, M. A., Design of reinforced concrete beams with web openings, 2006) model starts cracking at load higher than the beam designed according to (Kong, F.K. and Sharp, G.R., Magazine of Concrete Res_30:89-95, 1978) method. The deep beam detailed according to (Kong, F.K. and Sharp, G.R., Magazine of Concrete Res_30:89-95, 1978) and (Mansur, M. A., Design of reinforced concrete beams with web openings, 2006) failed due to extensive shear cracks. The specimen detailed according to STM restores its capacity after initial failure. The three models satisfy the deflection limit. Conclusion It is found that the three design approaches give sufficient ultimate load capacity. The amount of reinforcement given by both (Mansur, M. A., Design of reinforced concrete beams with web openings, 2006) and (Kong, F.K. and Sharp, G.R., Magazine of Concrete Res_30:89-95, 1978) is the same. The reinforcement used by the STM method is higher than the other two methods. Additional reinforcement is needed to limit the crack widths. (Mansur, M. A., Design of reinforced concrete beams with web openings, (2006)) method gives lesser steel reinforcement requirement and higher failure load compared to the other two methods.

Dynamic shear failure and size effect in BFRP-reinforced concrete deep beam

2021 ◽  
Vol 245 ◽  
pp. 112951
Author(s):  
Liu Jin ◽  
Yushuang Lei ◽  
Wenxuan Yu ◽  
Xiuli Du
Keyword(s):  
Reinforced Concrete ◽  
Size Effect ◽  
Shear Failure ◽  
Deep Beam ◽  
Dynamic Shear

Behavior and strength of reinforced concrete flanged deep beams with web openings

Structures ◽  
2020 ◽  
Vol 27 ◽  
pp. 506-524 ◽  
Author(s):  
Ata El-Kareim ◽  
Ahmed Arafa ◽  
Amal Hassanin ◽  
Mohamed Atef ◽  
Ahmed Saber
Keyword(s):  
Reinforced Concrete ◽  
Deep Beams ◽  
Web Openings

Experimental analysis of reinforced concrete shear deficient beams with circular web openings strengthened by CFRP composite

2020 ◽  
Vol 249 ◽  
pp. 112561 ◽  
Author(s):  
Ceyhun Aksoylu ◽  
Şakir Yazman ◽  
Yasin Onuralp Özkılıç ◽  
Lokman Gemi ◽  
Musa Hakan Arslan
Keyword(s):  
Reinforced Concrete ◽  
Experimental Analysis ◽  
Web Openings ◽  
Cfrp Composite

Study on Mechanical Behaviors and Calculation of Shear Strength of Steel Truss Reinforced Concrete Deep Beams

2011 ◽  
Vol 243-249 ◽  
pp. 514-520
Author(s):  
Chun Yang ◽  
Ming Ji He ◽  
Jian Cai ◽  
Yan Sheng Huang ◽  
Yi Wu
Keyword(s):  
Shear Strength ◽  
Reinforced Concrete ◽  
Experimental Investigations ◽  
Deep Beam ◽  
Deep Beams ◽  
Steel Reinforced Concrete ◽  
Strut And Tie ◽  
Steel Truss ◽  
Mechanical Performances ◽  
Strut And Tie Model

Based on strut-and-tie model (STM) in deep beams, steel truss reinforced concrete (STRC) deep beam was developed. Experimental investigations of mechanical performances of STRC deep beams were carried out, and results show that STRC deep beam is of high ultimate bearing capacity, large rigidity and good ductility; Strut-and-tie force transference model is formed in STRC deep beams, and loads can be transferred in the shortest and direct way. Then Steel reinforced concrete (SRC) strut-and-tie model (SSTM) for determining the shear strength of STRC deep beams is proposed. The contribution of SRC diagonal strut, longitudinal reinforcements, stirrups and web reinforcements to the shear strength of STRC deep beams are determined with consideration of softened effects of concrete, and for safe consideration, superposition theory is employed for SRC struts. Computer programs are developed to calculate the shear strength of STRC deep beams and verified by experimental results.

scholarly journals Dynamic displacement analysis of reinforced concrete deep beams made of high strength concrete. Part II: Dynamic displacement analysis of reinforced concrete deep beams made of high strength C200 grade concrete

2018 ◽  
Vol 67 (2) ◽  
pp. 25-48
Author(s):  
Waldemar Cichorski
Keyword(s):  
Reinforced Concrete ◽  
Dynamic Load ◽  
High Strength Concrete ◽  
Construction Materials ◽  
High Strength ◽  
Deep Beam ◽  
Deep Beams ◽  
Dynamic Displacement ◽  
Displacement Analysis ◽  
Strength Concrete

The dynamic load displacements were analysed of rectangular concrete deep beams made of very high strength concrete, grade C200, including an evaluation of the physical non-linearity of the construction materials: concrete and reinforcing steel. The analysis was conducted using the method presented in [1]. The numerical calculation results are presented with particular reference to the displacement state of rectangular concrete deep beams. A comparative analysis was conducted on the effect of the high-strength concrete and the steel of increased strength on a class C200 concrete deep beam versus the results produced in [10] for a class C100 concrete deep beam. Keywords: mechanics of structures, reinforced concrete structures, deep beams, dynamic load, physical non-linearity

scholarly journals Experimental Study on Shear Behavior of Reinforced Concrete Sandwich Deep Beam

2020 ◽  
Vol 44 (5) ◽  
pp. 301-309
Author(s):  
Vaka Gopi ◽  
Kagita Kumara Swamy ◽  
Arepalli Peda Gopi ◽  
Vejendla Lakshman Narayana
Keyword(s):  
Experimental Study ◽  
Shear Strength ◽  
Reinforced Concrete ◽  
Effective Length ◽  
Common Element ◽  
Experimental Program ◽  
Deep Beam ◽  
Shear Reinforcement ◽  
Deep Beams ◽  
Depth Ratio

In present making of construction industry at a high pace. The tendency of world influenced the high raised buildings. In modern days one of the most common element is deep beam, constructed a small span to depth ratio. The transfer girders most of used in deep beams. In an experimental program consists of 12 deep beam specimens are carried out for shear strength behavior investigation of Reinforced Concrete sandwich deep beam concealed with insulation pad in various depths 200mm and 300mm and 400mm. in the experimental program effective length, depth, the width of the specimens, width of bearing plates, longitudinal reinforcement as 1% to maintain constantly and horizontal reinforcement as varies as 0.15% and 0.25% and 0.35%. We are considered shear span to depth ratio of deep beam is 0.95. The main aim of the experimental study the influence of longitudinal shear reinforcement along with vertical and horizontal shear reinforcement on the shear strength, shear ductility of RC sandwich deep beams of insulation pads placed at different depths.

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