Shear strength of heavily reinforced concrete members with circular cross section

Jensen, Uffe Graaskov; Hoang, Linh Cao; Joergensen, Henrik Broener; Fabrin, Lars S.

doi:10.1016/j.engstruct.2009.11.008

Cited by 29 publications

(10 citation statements)

References 6 publications

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“…It should be noted that the underestimation of the flexural strength of the columns should be treated with caution because it will underestimate the shear demand of the members [15]. Failure due to shear is very brittle and should always be avoided in the design [16,17].…”

Section: Introductionmentioning

confidence: 97%

Strain gradient effects on flexural strength design of normal-strength concrete columns

Ho¹,

Peng²

2011

Engineering Structures

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a b s t r a c tThe equivalent rectangular concrete stress block has commonly been adopted for the flexural strength design of reinforced concrete (RC) members for decades. In this stress block, the equivalent concrete stress is expressed as αf ′ c (f ′ c is the uni-axial concrete cylinder strength). Currently, the value of α adopted in various RC design codes is only concrete-strength dependent and equal to 0.85 for NSC. However, in an experimental study conducted previously by the authors on NSC columns subjected to concentric and eccentric axial loads, it was found that α increases significantly as the strain gradient increases. Therefore, the effect of the strain gradient should not be neglected. In this paper, a review on the previous test results on NSC columns is presented and a strain-gradient dependent equivalent rectangular concrete stress block is developed. Based on this proposed stress block, a new flexural strength design method for NSC columns that incorporates the effects of the strain gradient is proposed. A series of column interaction diagrams with various concrete strengths and steel ratios are derived for design purposes. Lastly, these interaction diagrams are compared with the existing column design charts provided in various RC design codes to verify their applicability.

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Section: Introductionmentioning

confidence: 97%

Strain gradient effects on flexural strength design of normal-strength concrete columns

Ho¹,

Peng²

2011

Engineering Structures

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“…Furthermore, past studies have reported that the calculations required for flexural capacity of circular RC members are relatively complex as compared to the rectangular or square members [15][16][17]. According to the Japan Society of Civil Engineers (JSCE) specifications, the capacity of circular column is determined by converting it to an equivalent area square column but the effect of longitudinal reinforcement present on compression side is not considered [18].…”

Section: Introductionmentioning

confidence: 99%

Performance Comparison of High Strength Reinforced Concrete Circular and Square Columns Subjected to Flexural Controlled Cyclic Loading

2021

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In existing design practices selection of circular or square column shape mostly depends upon architectural needs rather than structural behavior. The behavior of equivalent area (circular and square), high strength reinforced concrete columns is reported to be same under monotonic loading conditions but their behavior under fatigue loading is not well-established. This paper presents the comparison of high strength reinforced concrete circular and square equivalent area columns’ performance (load-deflection behavior) under fatigue loading. Columns were casted in four configurations: square and circular shapes and with and without shear stirrups. Experimental results showed that in case of columns without shear stirrups, the square column resisted 38% more loading cycles as compared to circular column while the maximum deflection was 78% more than the circular column. Similarly, in case of columns with shear stirrups, square shaped column resisted 55% more loading cycles with only 5% more maximum deflections as compared to circular column. The results show that the square columns might be considered more ductile as compared to circular columns under the application of cyclic loading conditions like wind forces or seismic forces. Therefore, it might be concluded that square columns should be recommended for highly seismic regions as compared to circular columns with equivalent area. Doi: 10.28991/cej-2021-03091639 Full Text: PDF

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“…Most of the research on reinforcement of concrete members is focused on rectangular cross sections [3]. However, circular cross sectional reinforced concrete elements are frequently used civil engineering construction, for instance, as columns in reinforced concrete buildings, as pile foundations, and bridge piers [4][5]. The circular shaped cross section allows structural elements to have the same response to internal forces that occur from all directions [6].…”

Section: Introductionmentioning

confidence: 99%

“…The shear capacity of circular cross sectional reinforced concrete elements is different from other cross sections. The circular cross sectional shear capacity of reinforced concrete structural elements has been investigated by several previous researchers before [3][4][5][6][7][8][9][10][11][12]. Thamrin et al [3] has developed an analytical prediction model that has been found to compare well with experimental results.…”

Section: Introductionmentioning

confidence: 99%

“…Thamrin et al [3] has developed an analytical prediction model that has been found to compare well with experimental results. Jensen et al [4] used experimental results of the shear forces on rectangular elements to predict the shear forces on circular cross section elements. Turmo et al [5] developed an analogy for shear in circular concrete truss elements with hollow and solid cross-section.…”

Section: Introductionmentioning

confidence: 99%

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Effect of stirrup type on shear capacity of reinforced concrete members with circular cross section

et al. 2020

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An experimental study of shear behaviour of reinforced concrete members with solid circular cross sections is presented. The test variables were ratio of longitudinal reinforcement and type of stirrups. The test was carried out on nine beams. Three beams were designed without stirrups, three with closed hoop stirrups, and the other with spiral stirrups. All tested beams were subjected to two-point monotonic loads. The test results showed that all beams without stirrups failed due to the shear force. Beams with hoop or spiral stirrups failed in flexural mode. The flexural capacity of beams with hoops and spiral stirrups was similar but the beams with spiral stirrups showed a slightly higher ductility. Analytical predictions showed that the chosen numerical model predicted the test result with good accuracy.

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Shear strength of heavily reinforced concrete members with circular cross section

Cited by 29 publications

References 6 publications

Strain gradient effects on flexural strength design of normal-strength concrete columns

Strain gradient effects on flexural strength design of normal-strength concrete columns

Performance Comparison of High Strength Reinforced Concrete Circular and Square Columns Subjected to Flexural Controlled Cyclic Loading

Effect of stirrup type on shear capacity of reinforced concrete members with circular cross section

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