Experimental Evaluation of Shear Behaviors of Concrete Deep Beams with GFRP Shear Reinforcement

2015 ◽  
Vol 764-765 ◽  
pp. 1080-1084
Author(s):  
Young Hak Lee ◽  
Hee Cheul Kim ◽  
Ha Eun Park ◽  
Nam Shik Ahn ◽  
Min Sook Kim
Keyword(s):  
Shear Strength ◽  
Failure Modes ◽  
Deep Beam ◽  
Test Results ◽  
Shear Reinforcement ◽  
Shear Span ◽  
Depth Ratio ◽  
Beam Shear ◽  
Effective Depth ◽  
Shear Behaviors

This paper deals with the application of Glass Fiber Reinforce Polymer (GFRP) to shear reinforcement for deep beam. Instead of steel stirrup, GFRP shear reinforcement was fabricated in the form of plate with openings and embedded in concrete. An experimental study was performed to evaluate the shear behavior of eight shear reinforced concrete deep beam. Shear test was conducted in which the shear span-to-depth ratio were 1.1, 1.3 and 1.6. Also, shear reinforcement area, and effective depth were considered as variables. Crack patterns, failure modes, and load-displacement were compared in order to evaluate shear strength of the specimens. The effects of these variables on the shear strength of the deep beam were examined. The test results in terms of the shear span-to-depth ratio showed that shear strength increased when the ratio decreased. Also, it showed that shear strength increased as the reinforcement area and the effective depth increased.

Shear Strength Prediction of Reinforced Concrete Deep Beams Using Strut-and-Tie Model

2014 ◽  
Vol 931-932 ◽  
pp. 468-472
Author(s):  
Piyoros Tasenhod ◽  
Jaruek Teerawong
Keyword(s):  
Shear Strength ◽  
Reinforced Concrete ◽  
Failure Modes ◽  
Reinforced Concrete Beams ◽  
Strength Prediction ◽  
Test Results ◽  
Shear Span ◽  
Strut And Tie ◽  
Effective Depth ◽  
Strut And Tie Model

Shear strength prediction of simple deep reinforced concrete beams by method of strut-and-tie model is presented in this paper. The tested specimens were designed according to Appendix A of ACI 318-11 code with variations of shear span-to-effective depth ratios and ratios of horizontal and vertical crack-controlling reinforcement. Test results revealed that at the same shear span-to-effective depth ratio, the various crack-controlling reinforcements significantly influenced on strength reduction coefficients of strut and failure modes. When the shear span-to-effective depth ratios were increased, failure modes changed from splitting diagonal strut to flexural-shear failure. Based on the test results, the proposed model was compared with Appendix A of ACI 318-11code.

scholarly journals Influence of Shear Span-to-Effective Depth Ratio on Behavior of High-Strength Reinforced Concrete Beams

2021 ◽  
Vol 15 (1) ◽  
Author(s):  
Olaniyi Arowojolu ◽  
Ahmed Ibrahim ◽  
Abdullah Almakrab ◽  
Nicholas Saras ◽  
Richard Nielsen
Keyword(s):  
Shear Strength ◽  
Reinforced Concrete ◽  
High Strength ◽  
Shear Resistance ◽  
Design Guidelines ◽  
Reinforced Concrete Beams ◽  
Shear Reinforcement ◽  
Shear Span ◽  
Depth Ratio ◽  
Effective Depth

AbstractThe shear span-to-effective depth ratio (a/d) is one of the factors governing the shear behavior of reinforced concrete (RC) beams, with or without shear reinforcement. In high-strength concrete (HSC), cracks may propagate between the aggregate particles and result in a brittle failure which is against the philosophy of most design guidelines. The experimental results of six HSC beams, with and without shear reinforcement, tested under four-point bending with a/d ranged from 2.0 to 3.0 are presented and compared with different model equations in design codes. The a/d ratio has higher influence on the shear strength of reinforced HSC beams without shear reinforcement than beams with shear reinforcement. Most of the shear resistance prediction models underestimate the concrete shear strength of the beams but overpredict shear resistance of beams with shear reinforcement. However, the fib Model code 2010 accurately predicted the shear resistance for all the beams within an appropriate level of approximation (LoA).

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.

scholarly journals The improved design method of shear strength of reinforced concrete beams without transverse reinforcement

2017 ◽  
Vol 12 (2) ◽  
pp. 39-45 ◽  
Author(s):  
Pavlo Vegera ◽  
Rostyslav Vashkevych ◽  
Roman Khmil ◽  
Zinoviy Blikharskyy
Keyword(s):  
Shear Strength ◽  
Reinforced Concrete ◽  
Concrete Beams ◽  
Design Method ◽  
Variable Parameter ◽  
Reinforced Concrete Beams ◽  
Shear Span ◽  
Depth Ratio ◽  
Effective Depth ◽  
Improved Design

Abstract In this article, results of experimental testing of reinforced concrete beams without transverse shear reinforcement are given. Three prototypes for improved testing methods were tested. The testing variable parameter was the shear span to the effective depth ratio. In the result of the tests we noticed that bearing capacity of RC beams is increased with the decreasing shear span to the effective depth ratio. The design method according to current codes was applied to test samples and it showed a significant discrepancy results. Than we proposed the improved design method using the adjusted value of shear strength of concrete CRd,c. The results obtained by the improved design method showed satisfactory reproducibility.

Prestressed Precast Hollow-Core Slabs with Different Shear Span to Effective Depth Ratio

2017 ◽  
Vol 5 (2) ◽  
pp. 1-11 ◽  
Author(s):  
Jasim Mahmood Mhalhal
Keyword(s):  
Shear Failure ◽  
Test Results ◽  
Hollow Core ◽  
Shear Span ◽  
Flexural Failure ◽  
Depth Ratio ◽  
Hollow Core Slab ◽  
Failure Loads ◽  
Length Width ◽  
Effective Depth

Four full scale precast prestressed hollow-core slabs were tested under the influence of four lines loading with various values of shear span to effective depth ratio (a/d) (1.5, 2, 3.5 and 5). The dimensions of the hollow-core slab were 2000 mm, 1200 mm and 150 mm (length, width and thickness, respectively). All slabs were cast with a high compressive strength concrete of approximately 79.5 MPa. Experimental test results showed four patterns of failure mode depending on the ratio of (a/d). They were flexural failure, flexure-shear failure and shear compression failure. In addition to combination failure between tension shear and anchorage failure, accompanied by sliding strand in concrete. The failure loads decreased about 19.6% as (a/d) increased by 233.3%.  Finally, the highest first crack load, 110kN, was recorded for sample, HCS 1.5, having the lowest (a/d) ratio.

Experimental Study on Shear Behavior of Prestressed Concrete Beams

2012 ◽  
Vol 226-228 ◽  
pp. 1045-1048 ◽  
Author(s):  
Guo Lin Wang ◽  
Wen Sheng Ding
Keyword(s):  
Shear Strength ◽  
Prestressed Concrete ◽  
Design Method ◽  
Shear Behavior ◽  
Test Results ◽  
Shear Span ◽  
Strut And Tie ◽  
Arch Effect ◽  
Depth Ratio ◽  
Strut And Tie Model

Two simply supported beams with a shear span to depth ratio of 2.2 were tested, one with straight prestresssing tendons and the other without for reference. The shear behavior and the prestressing effect are focused on. The test results showed that the prestressed concrete (PC) beam has a significant arch effect, and the prestressing could greatly increase both the cracking load and the shear strength. Besides, the Modified Strut-and-Tie Model (MSTM) and the sectional design method from China Code (GB10) and ACI318-08 have also been adopted for predictions. The comparisons indicates that the MSTM can not only well predict the shear strengths of PC beams with a small shear span to depth ratio, but also well account for the prestressing effect, while the sectional design method seems so conservative due to its not properly considering the shear mechanism of such beams. It can be concluded that the MSTM is capable of predicting the shear strength of PC beams with significant arch effect and thus can be employed in practical designs.

Structural Behavior of Steel Reinforced Sandwich Concrete Beam with Pumice Lightweight Concrete Core

2016 ◽  
Vol 845 ◽  
pp. 158-165
Author(s):  
Akmaluddin ◽  
Suryawan Murtiadi ◽  
Zaedar Gazalba
Keyword(s):  
Shear Strength ◽  
Lightweight Concrete ◽  
Concrete Beams ◽  
Flexural Behavior ◽  
Structural Behavior ◽  
Skin Thickness ◽  
Shear Reinforcement ◽  
Shear Span ◽  
Depth Ratio ◽  
Ultimate Moment

This study is aimed to discuss structural behavior of steel reinforced sandwich concrete beams (SWB) consisted of skins and a core. The skins were made of ordinary concrete and a core was of pumice lightweight concrete. The SWB skin compressive strengths of 30 MPa and the core compressive strength of 15 MPa were considered. Twelve SWB specimen of 150x250x2500 mm with 50 mm skin thickness and 150 mm core thickness were cast and tested after curing process under flexural points loading as simply supported beams. All the beams considered were reinforced with 3D12 mm deformed bar and 8 mm stirrups with 3 spacing variations. Shear span depth ratio (a/d) of 1.8, 2.3, 2.8, and 5.4 were also considered to reflect the behavior between short and slender beams. Results showed that the flexural behavior of sandwich beams were identical with normal or lightweight concrete beams behavior. Ultimate moment of beam section slightly increased with increasing the shear span to depth ratio, which were varies between 1.26 and 2.31 of the calculated moment. The yield moment to the ultimate moment ratio vary between 0.83 and 0.99. The ductility was increased with the decreased shear reinforcement spacing. The shear strength increased as the spacing of shear reinforcement decreases in almost all a/d variations. Shear strength was also increased with the increase of a/d ratio for short beam and the other hand shear strength decreased with the increasing a/d.

scholarly journals Punching Shear Strength of Reinforced Concrete Flat Plates with GFRP Vertical Grids

2021 ◽  
Vol 11 (6) ◽  
pp. 2736
Author(s):  
Min Sook Kim ◽  
Young Hak Lee
Keyword(s):  
Shear Strength ◽  
Reinforced Concrete ◽  
Fiber Reinforced Polymer ◽  
Punching Shear ◽  
Test Results ◽  
Shear Reinforcement ◽  
Flat Plates ◽  
Reinforced Polymer ◽  
Glass Fiber Reinforced ◽  
Vertical Grids

In this study, the structural behavior of reinforced concrete flat plates shear reinforced with vertical grids made of a glass fiber reinforced polymer (GFRP) was experimentally evaluated. To examine the shear strength, experiments were performed on nine concrete slabs with different amounts and spacings of shear reinforcement. The test results indicated that the shear strength increased as the amount of shear reinforcement increased and as the spacing of the shear reinforcement decreased. The GFRP shear reinforcement changed the cracks and failure mode of the specimens from a brittle punching to flexure one. In addition, the experimental results are compared with a shear strength equation provided by different concrete design codes. This comparison demonstrates that all of the equations underestimate the shear strength of reinforced concrete flat plates shear reinforced with GFRP vertical grids. The shear strength of the equation by BS 8110 is able to calculate the punching shear strength reasonably for a concrete flat plate shear reinforced with GFRP vertical grids.

Shear strength of disturbed regions with corroded stirrups in reinforced concrete beams

2010 ◽  
Vol 37 (8) ◽  
pp. 1045-1056 ◽  
Author(s):  
Christopher Suffern ◽  
Ahmed El-Sayed ◽  
Khaled Soudki
Keyword(s):  
Shear Strength ◽  
Reinforced Concrete ◽  
Concrete Beams ◽  
Corrosion Damage ◽  
Reinforced Concrete Beams ◽  
Test Results ◽  
Accelerated Corrosion ◽  
Damage Level ◽  
Three Point Bending ◽  
Shear Span

This paper reports experimental data on the structural performance of disturbed regions in reinforced concrete beams with corrosion damage to the embedded steel stirrups. A total of 15 reinforced concrete beams were constructed and tested. The test beams were 350 mm deep, 125 mm wide, and 1850 mm long. The beams were tested in three-point bending under a simply supported span of 1500 mm. Nine beams had the embedded stirrups subjected to accelerated corrosion. The test variables were the corrosion damage level and the shear span-to-depth ratio. The test results indicated that the corroded beams exhibited reduced shear strength in comparison to the uncorroded control specimens. The shear strength reduction was up to 53%. Furthermore, the reduction in shear strength due to the corrosion was found to be greater at smaller shear span-to-depth ratios.

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