Shear strength evaluation of RC D-Regions based on Single-Panel Strut-and-Tie model

Yi, Wei-Jian; Li, Ye; Chen, Hui; John, Zhongguo; Zhou, Ke-Jing; Huang, Yuan; Zhou, Yun

doi:10.1016/j.engstruct.2022.114500

Cited by 10 publications

(2 citation statements)

References 27 publications

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“…Due to the localized pressure effect, the localized pressure is too high, and two types of failures occur in the strut-and-tie model. The failure of the compression bar leads to damage to the anchorage zone, which is manifested as cracks on the concrete surface [21][22][23][24][25]. The failure of the tie rod is manifested as cracking on the side surface of the concrete spreading the damage.…”

Section: Basic Configuration Of the Strut-and-tie Modelmentioning

confidence: 99%

Optimized Design of Anchor Plates for 2200 MPa-Class Prestressing Anchorage Zones

Lu,

Zhu

2024

Buildings

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The strength of prestressed steel strands has developed towards high strength, increasing from 1860 MPa to over 2200 MPa. The stress in the prestressed anchorage zone is more concentrated and complex, and the anchor plates for dispersed loads need to be optimized in design. This article proposes a design scheme for adding a middle pressure-bearing step based on the existing anchor plate and then establishes a 1/4 model of the concrete anchoring area of the anchor plate for finite element analysis. Based on the theory of the strut-and-tie model, the position of the middle pressure-bearing step is determined according to the maximum angle of the strut-and-tie model. Then, carry out force transfer tests in the anchorage zone for verification. The research results indicate that after adding a middle pressure bearing step to the anchor plate, the angle between the strut-and-tie model in the anchorage zone increases, and the bearing capacity improves. The position of the middle pressure-bearing step in the anchor plate is different, and the angle between the strut-and-tie models is different. According to the middle step position parameter, λ (the ratio of the effective width of the middle step to the distance from the middle step to the end face of the anchor plate) is 0.533 to optimize the anchor plate, and the bearing capacity of its anchorage zone is relatively high. The main tensile and main compressive stresses of the anchor plate after optimization increased by 6.2% and 5.74%, respectively, compared to the anchor plate before optimization. The main tensile stress of the spiral reinforcement under the anchor plate decreased by 0.59%, the main compressive stress decreased by 2.89%, and the von-Mises stress decreased by 2.32%. The side surface tensile stress of concrete under the anchor plate was reduced by 4.3 percent. Finally, three concrete specimens were poured for force transfer testing in the anchorage zone, verifying the safety and reliability of the optimized anchor plate in the 2200 MPa-level prestressed anchorage zone.

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Section: Basic Configuration Of the Strut-and-tie Modelmentioning

confidence: 99%

Optimized Design of Anchor Plates for 2200 MPa-Class Prestressing Anchorage Zones

Lu,

Zhu

2024

Buildings

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“…The American code ACI318-19 [13], the European code EN 1992-1-1 [14] and the Canadian code CSA A23.3-19 [15] all introduce the strut-and-tie model for the bearing capacity design of D-region components. The strut-and-tie model has been widely used and continuously improved at home and abroad [16][17][18][19][20]. Subsequently, Hwang and Lee proposed the softened strut-and-tie model (SSTM) based on the strut-and-tie model, which considered the softening characteristics of concrete under compression, and its applicability was tested in shear analysis of various concrete components [21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Analysis of Shear Model for Steel-Fiber-Reinforced High-Strength Concrete Corbels with Welded-Anchorage Longitudinal Reinforcement

Peng

Wang

et al. 2023

Materials

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According to the shear capacity test results of six steel-fiber-reinforced high-strength concrete (SFHSC) corbels with welded-anchorage longitudinal reinforcement under concentrated load, the effects of shear span ratio and steel fiber volume fraction on the failure mode, cracking load and ultimate load of corbel specimens were analyzed. On the basis of experimental research, the shear transfer mechanism of corbel structure was discussed. Then, a modified softened strut-and-tie model (MSSTM), composed of the diagonal and horizontal mechanisms, was proposed, for steel-fiber-reinforced high-strength concrete corbels. The contributions of concrete, steel fiber and horizontal stirrups to the shear bearing capacity of the corbels were clarified. A calculation method for the shear bearing capacity of steel-fiber-reinforced high-strength concrete corbels was established and was simplified on this basis. The calculation results of the model were compared with the test values and calculation results of the GB50010-2010 code, the ACI318-19 code, the EN 1992-1-1 code and the CSA A23.3-19 code. The results showed that the concrete corbel with small shear span ratio mainly has two typical failure modes: shear failure and diagonal compression failure. With the increase in shear span ratio, the shear capacity of corbels decreases. Steel fiber can improve the ductility of a reinforced concrete corbel, but has little effect on the failure mode of the diagonal section. The calculated values of the national codes were lower than the experimental values, and the results were conservative. The theoretical calculation values of the shear capacity calculation model of the corbels were close to the experimental results. In addition, the model has a clear mechanical concept considering the tensile properties of steel-fiber-reinforced high-strength concrete and the influence of horizontal stirrups, which can reasonably reflect the shear transfer mechanism of corbels.

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Shear strength of prestressed concrete beams with short shear span: Full‐scale experiments and evaluation of design methods

Duanmu,

Xu,

et al. 2024

Structural Concrete

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Prestressed concrete (PC) is increasingly used in civil engineering construction. Notably, research on shear resistance in PC beams with short shear span remains relatively limited, necessitating further comprehensive exploration. In the study, tests were conducted on bonded post‐tensioned PC T‐beams with short shear span (a/h = 1.0), subjecting them to monotonic loading destructive tests. These beams measured 24.9 m in length, 1.605 m in height, and had a top flange width of 2.0 m. They featured a uniform cross‐section with a 0.22 m web thickness. Given the size of the full‐scale test beams and space constraints for loading, an innovative loading scheme was devised to minimize the counterweight. Test results demonstrate the safety and feasibility of the loading scheme. The tests were conducted five times and the main test variables were the draped tendons and the quantity of horizontal web reinforcement. The tests revealed that horizontal web reinforcement significantly influenced crack propagation but had a minimal effect on shear strength. For the parameter values taken for the test beams, the prestressing level has less effect on the shear strength of the beam. Simultaneously, an investigation was conducted involving a total of 119 PC beams. This investigation aimed to evaluate the degree of conservatism and accuracy in shear design code provisions and shear strength equations derived from various standards, including the strut‐and‐tie model (STM) of ACI, AASHTO, and Tan, as well as the critical crack model of Yuan and the truss model of Laskar. Comparative analysis indicates that, the design method provided by Yuan exhibit relatively superior predictive capabilities.

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Shear strength evaluation of RC D-Regions based on Single-Panel Strut-and-Tie model

Cited by 10 publications

References 27 publications

Optimized Design of Anchor Plates for 2200 MPa-Class Prestressing Anchorage Zones

Optimized Design of Anchor Plates for 2200 MPa-Class Prestressing Anchorage Zones

Analysis of Shear Model for Steel-Fiber-Reinforced High-Strength Concrete Corbels with Welded-Anchorage Longitudinal Reinforcement

Shear strength of prestressed concrete beams with short shear span: Full‐scale experiments and evaluation of design methods

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