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Verification of Truss-Arch model unified for RC beams with stirrups using shear database
Highlights A shear strength analysis model called Truss-Arch Model Unified (TAMU) is further verified using a large experimental shear database. The TAMU is a limited analysis model that can be executed by hand methods of analysis to predict the maximum load-carrying capacity of RC beams. The shear database consists of 460 tested RC beams with shear reinforcement whose shear span-depth ratios (a/d) are between 0.5 and 4.5. In both B-and d-regions, the TAMU method gives the most accurate and tight estimates of the ultimate shear capacity of shear-reinforced beams compared to code-based strength analysis methods. The TAMU method can be applicable for RC beams with shear span-depth (a/d) ratios less than 4.5, which include deep and intermediate beams. Thus, the TAMU method may be a viable improvement as an alternative strength analysis method for shear-critical reinforced concrete beams with transverse reinforcement.
Abstract A shear strength analysis model called “Truss-Arch Model Unified (TAMU)” was proposed for shear-critical reinforced concrete (RC) beams with transverse reinforcement. The TAMU has its roots in the Compatibility Strut-and-Tie Model (C-STM) which is a computational modeling approach for the overall force–deformation analysis of deep beams. The TAMU simplified the C-STM so that a limited analysis can be executed by hand methods of analysis to predict the maximum load-carrying capacity of RC deep beams. While the tensile stress of concrete is generally taken into account to evaluate the shear strength of RC beams, the TAMU limit analysis focuses on the strength reduction of the principal diagonal concrete arch due to the transverse principal tensile strain. In the present study, a shear database is assembled from previous works reported in the literature to further substantiate the validity of the TAMU approach. The shear database consists of tested RC beams with shear reinforcement whose shear span-depth ratios (a/d) are between 0.5 and 4.5. Comparative TAMU analysis results show satisfactory agreement with the ultimate strengths observed in 460 RC beam tests regardless of D- and B-regions, demonstrating the method’s ability to predict the maximum load-carrying capacity for shear-critical beams. Additionally, the TAMU approach shows better accuracy and consistency against the database compared to AASHTO sectional shear design methods. The probability of reasonable prediction of the TAMU method is 92% in d-regions and 78% in B-regions, respectively, which is significantly higher than those of AASHTO sectional shear design methods, especially in d-regions. Thus, the TAMU method may be a viable improvement as an alternative strength analysis method for shear-critical RC beams with transverse reinforcement.
Verification of Truss-Arch model unified for RC beams with stirrups using shear database
Highlights A shear strength analysis model called Truss-Arch Model Unified (TAMU) is further verified using a large experimental shear database. The TAMU is a limited analysis model that can be executed by hand methods of analysis to predict the maximum load-carrying capacity of RC beams. The shear database consists of 460 tested RC beams with shear reinforcement whose shear span-depth ratios (a/d) are between 0.5 and 4.5. In both B-and d-regions, the TAMU method gives the most accurate and tight estimates of the ultimate shear capacity of shear-reinforced beams compared to code-based strength analysis methods. The TAMU method can be applicable for RC beams with shear span-depth (a/d) ratios less than 4.5, which include deep and intermediate beams. Thus, the TAMU method may be a viable improvement as an alternative strength analysis method for shear-critical reinforced concrete beams with transverse reinforcement.
Abstract A shear strength analysis model called “Truss-Arch Model Unified (TAMU)” was proposed for shear-critical reinforced concrete (RC) beams with transverse reinforcement. The TAMU has its roots in the Compatibility Strut-and-Tie Model (C-STM) which is a computational modeling approach for the overall force–deformation analysis of deep beams. The TAMU simplified the C-STM so that a limited analysis can be executed by hand methods of analysis to predict the maximum load-carrying capacity of RC deep beams. While the tensile stress of concrete is generally taken into account to evaluate the shear strength of RC beams, the TAMU limit analysis focuses on the strength reduction of the principal diagonal concrete arch due to the transverse principal tensile strain. In the present study, a shear database is assembled from previous works reported in the literature to further substantiate the validity of the TAMU approach. The shear database consists of tested RC beams with shear reinforcement whose shear span-depth ratios (a/d) are between 0.5 and 4.5. Comparative TAMU analysis results show satisfactory agreement with the ultimate strengths observed in 460 RC beam tests regardless of D- and B-regions, demonstrating the method’s ability to predict the maximum load-carrying capacity for shear-critical beams. Additionally, the TAMU approach shows better accuracy and consistency against the database compared to AASHTO sectional shear design methods. The probability of reasonable prediction of the TAMU method is 92% in d-regions and 78% in B-regions, respectively, which is significantly higher than those of AASHTO sectional shear design methods, especially in d-regions. Thus, the TAMU method may be a viable improvement as an alternative strength analysis method for shear-critical RC beams with transverse reinforcement.
Verification of Truss-Arch model unified for RC beams with stirrups using shear database
Lee, Ju Dong (author) / Mander, John B. (author)
Engineering Structures ; 287
2023-04-17
Article (Journal)
Electronic Resource
English
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