Shear characteristics of high-strength concrete deep beams without shear reinforcements

Yang, Keun–Hyeok; Chung, Heon-Soo; Lee, Eun-Taik; Eun, Hee-Chang

doi:10.1016/s0141-0296(03)00110-x

Cited by 115 publications

(54 citation statements)

References 1 publication

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“…Based on non-linear fracture mechanics theory, Bažant and Kim 8 developed a size effect formula to consider the decrease in shear strength as the beam depth increases; this formula is adopted to modify the concrete properties used in the mechanism analysis presented in the current paper. Test results of simple deep beams performed by Tan and Lu 12 and Yang et al 13 showed that with the increase of section depth, the ultimate strength significantly decreased and the ACI 318-99 predictions became unconservative.…”

Section: Introductionmentioning

confidence: 99%

Influence of section depth on the structural behaviour of reinforced concrete continuous deep beams

Yang

Chung

Ashour

2007

Magazine of Concrete Research

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Although the depth of reinforced concrete deep beams is much higher than that of slender beams, extensive existing tests on deep beams have focused on simply supported beams with a scaled depth below 600 mm. In the present paper, test results of 12 two-span reinforced concrete deep beams are reported. The main parameters investigated were the beam depth, which is varied from 400 mm to 720 mm, concrete compressive strength and shear span-tooverall depth ratio. All beams had the same longitudinal top and bottom reinforcement and no web reinforcement to assess the effect of changing the beam depth on the shear strength of such beams. All beams tested failed owing to a significant diagonal crack connecting the edges of the load and intermediate support plates. The influence of beam depth on shear strength was more pronounced on continuous deep beams than simple ones and on beams having higher concrete compressive strength. A numerical technique based on the upper bound analysis of the plasticity theory was developed to assess the load capacity of continuous deep beams. The influence of the beam depth was covered by the effectiveness factor of concrete in compression to cater for size effect. Comparisons between the total capacity from the proposed technique and that experimentally measured in the current investigation and elsewhere show good agreement, even though the section depth of beams is varied. Notation

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Section: Introductionmentioning

confidence: 99%

Influence of section depth on the structural behaviour of reinforced concrete continuous deep beams

Yang

Chung

Ashour

2007

Magazine of Concrete Research

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“…To examine the appropriateness of the existing and proposed equations (and values) of the effective strengths of concrete struts, the ultimate strengths of 395 simply supported reinforced concrete deep beams, tested by Clark (1952), Smith and Vantsiotis (1982), Anderson and Ramirez (1989), Roller and Russell (1990), Tan et al (1995Tan et al ( , 1997aTan et al ( , 1997b, Teng et al (1996), Shin et al (1999), Oh and Shin (2001), Aguilar et al (2002), Yang et al (2003), Kim and Park (2005), Quintero-Febres et al (2006), Brena andRoy (2009), Sumpter et al (2009), and Lee et al (2011) were evaluated by using the three types of strut-tie models shown in Fig. 1.…”

Section: Strength Analyses Of Reinforced Concrete Deep Beamsmentioning

confidence: 99%

Strength of Concrete Struts for Strut-Tie Model Design of Reinforced Concrete Beams with Shear Span-to-Effective Depth Ratio of Less than 3.0

Chae¹,

Yun

2015

ACT

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The strut-tie model approaches of current design codes have proven to be effective in the ultimate strength analysis and design of disturbed regions in structural concrete. For the reliable analysis and safe design of disturbed regions using these approaches, the effective strength of concrete struts must be determined accurately. In this study, we proposed equations for the effective strengths of concrete struts that are useful for the three types of statically determinate and indeterminate strut-tie models of reinforced concrete deep beams with shear span-to-effective depth ratio of less than 3.0. The effects of the shear span-to-effective depth ratio, the compressive strength of concrete, and the flexural and shear reinforcement ratios were reflected in the proposed equations. To validate the proposed equations, the ultimate strengths of 395 reinforced concrete deep beams, tested to failure, were evaluated by using the three types of strut-tie models with existing and proposed equations.

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“…The reserve shear strength, defined as the difference between the ultimate shear strength and the diagonal shear cracking strength of the deep beams (Yang et al 2003), of the NC-100 and SCC-100 specimens was 226 and 235 kN, respectively, while that of the NC-50 and SCC-50 specimens was 244 and 236 kN, respectively. As listed in Table 9, the value of the reserve shear strength factor, defined as the ratio of the ultimate shear strength to the diagonal shear cracking strength was defined as reserve shear strength factor used as a criterion to measure the reserve strength (Yang et al 2003), was 3.0 and 2.9 for the NC-100 and SCC-100 specimens, respectively, while 2.6 and 2.5 for the NC-50 and SCC-50 specimens was shown, respectively. It was found that the SCC specimens showed the similar reserved shear resisting strength in comparison with the NC specimens even with the two different web reinforcements.…”

Section: Load Carrying Capacities and Initial Stiffnessmentioning

confidence: 99%

Shear Behavior and Performance of Deep Beams Made with Self-Compacting Concrete

Choi

Lee

Chu

et al. 2012

Int J Concr Struct Mater

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An experimental study was carried out to evaluate fresh properties of a moderately high-strength (high-flowing) selfcompacting concrete (SCC) and to investigate shear behavior and performance of deep beams made with SCC. Fresh and hardened properties of normal concrete (NC) and SCC were evaluated. The workability and compacting ability were observed based on casting time and number of surface cavities, respectively. Four-point loading tests on four deep beams (two made with SCC and two with NC) were then conducted to investigate their shear behavior and performance. Shear behavior and performance of beams having two different web reinforcements in shear were systematically investigated in terms of crack pattern, failure mode, and load-deflection response. It was found from the tests that the SCC specimen having a normal shear reinforcement condition exhibited a slightly higher load carrying capacity than the corresponding NC specimen, while the SCC specimen having congested shear reinforcement condition showed a similar load carrying capacity to the corresponding NC specimen. In addition, a comparative study between the present experimental results and theoretical results in accordance with ACI 318 (Building Code Requirements for Reinforced Concrete (ACI 318-89) and Commentary-ACI 318R-89, 1999), Hsu-Mau's explicit method (Hsu, Cem Concr Compos 20:419-435, 1998; Mau and Hsu, Struct J Am Concr Inst 86:516-523, 1989) and strut-and-tie model suggested by Uribe and Alcocer (2002) based on ACI 318 Appendix A (2008) was carried out to assess the applicability of the aforementioned methods to predict the shear strength of SCC specimens.

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Shear characteristics of high-strength concrete deep beams without shear reinforcements

Cited by 115 publications

References 1 publication

Influence of section depth on the structural behaviour of reinforced concrete continuous deep beams

Influence of section depth on the structural behaviour of reinforced concrete continuous deep beams

Strength of Concrete Struts for Strut-Tie Model Design of Reinforced Concrete Beams with Shear Span-to-Effective Depth Ratio of Less than 3.0

Shear Behavior and Performance of Deep Beams Made with Self-Compacting Concrete

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