scholarly journals Behavior of High-Strength Self-Consolidated Reinforced Concrete T-Deep Beams

2020 ◽  
Vol 14 (1) ◽  
pp. 51-69
Author(s):  
Hayder H. H. Kamonna ◽  
Qasim M. Shakir ◽  
Haider A. Al-Tameemi
Keyword(s):  
Reinforced Concrete ◽  
Failure Load ◽  
High Strength ◽  
Deep Beam ◽  
Deep Beams ◽  
Strength Concrete ◽  
Shear Span ◽  
Depth Ratio ◽  
Load Beam ◽  
Failure Loads

Background: When a beam is loaded on two opposite faces and the beam’s depth is increased such that either the span-to-depth ratio is smaller than four or the shear-span-to-depth ratio is less than two, it will behave like a deep beam. Strain distribution in deep beams is different from that of ordinary beams because it is nonlinear along with the beam depth. If the beam is cast monolithically with a slab in the slab–beam system, it is considered a T-deep beam. The behavior of the resulting member is more complicated. Objective: The effect of flange width on the behavior of high-strength self-consolidated reinforced concrete T-deep beams was investigated. Methods: Experimental and numerical studies were conducted. Two shear span-to-depth ratios (1.25 and 0.85) were adopted for two groups. Each group consisted of four specimens: one rectangular beam that served as a reference beam and three flanged beams with flange widths of 440, 660 and 880 mm. All specimens had an overall depth of 450 mm, a width of 160 mm and a total length of 1600 mm. The tests were performed under a two-point load with a clear span of 1400 mm. A nonlinear analysis was also performed using ANSYS software. Results: Throughout the study, the performance of the T-deep beams has been investigated in terms of cracking loads, failure loads, modes of failure, loading history, rate of widening of cracks and ductility index. Results revealed that such parameters have a different ranges of effect on the response of T-deep beams. Calibration of the ANSYS model has been done by comparing results of load-deflection curves, cracking and failure loads with that obtained experimentally. Conclusion: The study’s results indicated that increasing the flange width yielded an 88% improvement in the failure load and an approximately 68% improvement in the cracking load. This positive effect of flange width on the failure load was more pronounced in beams with higher shear span to- depth ratios and flange widths of 660 mm. In addition, the beam’s ductility was improved, especially in cases corresponding to a higher shear span-to-depth ratio. The finite element simulation showed good validation in terms of the load-deflection curve with a maximum failure load difference of 9%. In addition, the influence of longitudinal steel reinforcement on the behavior of such members was studied. Some parameters that reflect the effect of changing the flange width on the behavior of deep beams were also presented. Increasing the flange width is more effective when using normal strength concrete than when using high-strength concrete in terms of cracking load, beam stiffness, and failure load.

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 Dynamic displacement analysis of reinforced concrete deep beams made of high strength concrete. Part III: Analysis of dynamic displacement of a reinforced concrete deep beam made of high strength C300 grade concrete

2018 ◽  
Vol 67 (3) ◽  
pp. 129-154
Author(s):  
Waldemar Cichorski
Keyword(s):  
Reinforced Concrete ◽  
Dynamic Load ◽  
High Strength Concrete ◽  
Construction Materials ◽  
High Strength ◽  
Physical Nonlinearity ◽  
Deep Beam ◽  
Deep Beams ◽  
Dynamic Displacement ◽  
Strength Concrete

This work demonstrates an analysis of the displacement state of rectangular concrete deep beams made of very high strength concrete grade C300 under a dynamic load, including the physical nonlinearity of construction materials: concrete and reinforcing steel. The analysis was conducted with the method presented in [1]. Numerical solution results are presented with particular reference to the displacement state of a rectangular concrete deep beam. The work confirmed the accuracy of the assumptions and deformation models of concrete and steel as well as the effectiveness of the methods of analysis proposed in the paper [1] for the problems of numerical simulation of the behaviour of reinforced concrete deep beams under dynamic loads. A comparative analysis was conducted on the effect of the high-strength concrete and the steel of increased strength on the displacement of a grade C300 concrete deep beam vs. the results produced in [10] for grade C100 and C200 concrete deep beams. Keywords: mechanics of structures, reinforced concrete structures, deep beams, dynamic load, physical nonlinearity.

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 Experimental Study on Shear Capacity of High Strength Reinforcement Concrete Deep Beams with Small Shear Span–Depth Ratio

Materials ◽  
2020 ◽  
Vol 13 (5) ◽  
pp. 1218 ◽  
Author(s):  
Jun-Hong Zhang ◽  
Shu-Shan Li ◽  
Wei Xie ◽  
Yang-Dong Guo
Keyword(s):  
High Strength ◽  
Shear Capacity ◽  
Reinforcement Ratio ◽  
Longitudinal Reinforcement ◽  
Deep Beams ◽  
Shear Span ◽  
Depth Ratio ◽  
Diagonal Compression ◽  
Web Reinforcement ◽  
Small Shear

This study aimed to investigate the shear capacity performance for eight deep beams with HTRB600 reinforced high strength concrete under concentrated load to enable a better understanding of the effects of shear span–depth ratio, longitudinal reinforcement ratio, vertical stirrup ratio and in order to improve design procedures. The dimension of eight test specimens is 1600 mm × 200 mm × 600 mm. The effective span to height ratio l0/h is 2.0, the shear span–depth ratio λ is 0.3, 0.6 and 0.9, respectively. In addition, the longitudinal reinforcement ratio ρs is set to 0.67%, 1.05%, 1.27%, and the vertical stirrup ratio is taken to be 0%, 0.25%, 0.33%, 0.5%. Through measuring the strain of steel bar, the strain of concrete and the deflection of mid-span, the characteristics of the full process of shear capacity, the failure mode and the load deflection deformation curve were examined. The test results showed that the failure mode of deep beams with small shear span–depth ratio is diagonal compression failure, which is influenced by the layout and quantity of web reinforcement. The diagonal compression failure could be classified into two forms: crushing-strut and diagonal splitting. With decreasing of shear span–depth ratio and increasing longitudinal reinforcement ratio, the shear capacity of deep beams increases obviously, while the influence of vertical web reinforcement ratio on shear capacity is negligible. Finally, the shear capacity of eight deep beams based on GB 50010-2010 is calculated and compared with the calculation results of ACI 318-14, EN 1992-1-1:2004 and CSA A23.3-04, which are based on strut-and-tie model. The obtained results in this paper show a very good agreement with GB50010-2010 and ACI 318-14, while the results of EN 1992-1-1:2004 and CSA A23.3-04 are approved to be conservative.

scholarly journals Effect of Shear Span to Effective Depth Ratio on the Behavior of Self-Compacting Reinforced Concrete Deep Beams Containing Openings Strengthened with CFRP

2019 ◽  
Vol 26 (1) ◽  
pp. 1-9
Author(s):  
Nabeel A. Al-Bayati ◽  
Bassman R. Muhammed ◽  
Muroj F. Oda
Keyword(s):  
Reinforced Concrete ◽  
Ultimate Load ◽  
General Trend ◽  
Load Path ◽  
Deep Beams ◽  
Web Openings ◽  
Shear Span ◽  
Depth Ratio ◽  
Effective Depth ◽  
Strengthened Beam

Results of test on seven simply supported self-compacting reinforced concrete deep beams, including six of these beams containing circular openings in center of load path are reported in this paper. The objective of the tests was determined the influence of, changing shear span to effective depth ratio a/d, the existence of circular openings in shear span and using inclined strips of carbon fiber polymer (CFRP) on behavior of deep beams. The general trend in crack pattern, the load-deflection response, and the mode of failure of reinforced SCC deep beams were also investigated. All specimens had the same geometry, details of the flexure and shear reinforcement in both vertical and horizontal directions and they were tested under symmetrical two-point loads up to failure. The experimental results revealed that the web openings within shear spans caused an important reduction in the deep beam capacity by 50% when compared with the corresponding solid beam. The increase a/d ratio from 0.8 to 1.2 decreases the ultimate load by 21.7% and 22.5 % for the reference unstrengthened beam and strengthened beam, respectively, also it was found that the externally inclined CFRP strips in deep beams increased the ultimate strength up to 39.5%, and enhanced the stiffness of deep beams with openings.

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