scholarly journals Validation of the Critical Shear Crack Theory for punching of slabs without transverse reinforcement by means of a refined mechanical model

2018 ◽  
Vol 19 (1) ◽  
pp. 191-216 ◽  
Author(s):  
João T. Simões ◽  
Miguel Fernández Ruiz ◽  
Aurelio Muttoni
Keyword(s):  
Mechanical Model ◽  
Shear Crack ◽  
Transverse Reinforcement ◽  
Crack Theory

Critical shear crack theory-based punching shear model for FRP-reinforced concrete slabs

2020 ◽  
pp. 136943322097814
Author(s):  
Xing-lang Fan ◽  
Sheng-jie Gu ◽  
Xi Wu ◽  
Jia-fei Jiang
Keyword(s):  
Shear Strength ◽  
Reinforced Concrete ◽  
Shear Crack ◽  
Concrete Strength ◽  
Weight Ratio ◽  
Punching Shear ◽  
Concrete Slabs ◽  
Crack Theory ◽  
Reinforced Concrete Slabs ◽  
Rc Slabs

Owing to their high strength-to-weight ratio, superior corrosion resistance, and convenience in manufacture, fiber-reinforced polymer (FRP) bars can be used as a good alternative to steel bars to solve the durability issue in reinforced concrete (RC) structures, especially for seawater sea-sand concrete. In this paper, a theoretical model for predicting the punching shear strength of FRP-RC slabs is developed. In this model, the punching shear strength is determined by the intersection of capacity and demanding curve of FRP-RC slabs. The capacity curve is employed based on critical shear crack theory, while the demand curve is derived with the help of a simplified tri-linear moment-curvature relationship. After the validity of the proposed model is verified with experimental data collected from the literature, the effects of concrete strength, loading area, FRP reinforcement ratio, and effective depth of concrete slabs are evaluated quantitatively.

Design of Semilightweight Bridge Girders: Development-Length Considerations

2000 ◽  
Vol 1696 (1) ◽  
pp. 41-47 ◽  
Author(s):  
Robert J. Peterman ◽  
Julio A. Ramirez ◽  
Jan Olek
Keyword(s):  
Shear Crack ◽  
Point Load ◽  
Critical Section ◽  
Tension Force ◽  
Transverse Reinforcement ◽  
Development Length ◽  
Bond Failure ◽  
Moment Capacity ◽  
Maximum Moment ◽  
Prestressed Reinforcement

In a recent study, 25 development-length tests were conducted on rectangular and T-shaped semilightweight beams having design compressive strengths of 48 MPa (7,000 psi) and 69 MPa (10,000 psi). In the rectangular beam tests, the design moment capacity was exceeded in every case. However, in the tests on T-shaped beams, bond failure occurred in some specimens immediately after the formation of a flexure-shear crack. Additional tests were then conducted on similar T-shaped beams having varying amounts of transverse reinforcement near the point load. These tests showed that bond failure could be prevented by increasing the transverse reinforcement near the point of maximum moment. The study showed that the shift in the tension force that occurs when flexural cracks turn diagonally may lead to bond failure if sufficient anchorage of the strand is not provided. Therefore, the investigators recommend that the current AASHTO requirements for strand development be enforced at a “critical section” located at a distance dp from the point of maximum moment toward the free end of the strand, where dp is the distance from the extreme compression fiber to the centroid of the prestressed reinforcement.

scholarly journals Modelling of the shear resistance of self-stressed beams reinforced with FRP applying the Critical Shear Crack Theory

2021 ◽  
Vol 350 ◽  
pp. 00016
Author(s):  
Viktar Tur ◽  
Aliaksandr Varabei
Keyword(s):  
Shear Crack ◽  
Crack Opening ◽  
Shear Resistance ◽  
Experimental Investigations ◽  
Inclined Crack ◽  
Ultimate State ◽  
Bond Slip ◽  
Crack Theory ◽  
Dowel Action ◽  
Frp Bars

This paper presents a mechanical model of the shear resistance based on Critical Shear Crack Theory (CSCT) and its application for the checking of the shear ultimate state of self-stressed elements reinforced with FRP bars. The shear force, which is transmitted through the inclined crack by aggregate interlock, residual tensile strength, dowel action and inclined chord of the compression concrete, is calculated depending on the value of the inclined crack opening, determined according to the modified law “bond-slip” for FRP bars. The reliability of the proposed approach is confirmed by comparison both with the results of our own experimental investigations and with numerous research results by various authors.

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