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- 저자 : Jorge M.A. Andrade (검색결과 3 건)
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Luís F.A. Bernardo,Jorge M.A. Andrade 국제구조공학회 2017 Structural Engineering and Mechanics, An Int'l Jou Vol.61 No.5
A computing procedure is presented to predict the ultimate behavior of prestressed beams under torsion. This computing procedure is based on an extension of the Variable Angle Truss-Model (VATM) to cover both longitudinal and transversal prestressed beams. Several constitutive relationships are tested to model the behavior of the concrete in compression in the struts and the behavior of the reinforcement in tension (both ordinary and prestress). The theoretical predictions of the maximum torque and corresponding twist are compared with some results from reported tests and with the predictions obtained from some codes of practice. One of the tested combinations of the relationships for the materials was found to give simultaneously the best predictions for the resistance torque and the corresponding twist of prestressed beams under torsion. When compared with the predictions from some codes of practice, the theoretical model which incorporates the referred combination of the relationships provides best values for the torsional strength and leads to more optimized designs.
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Generalized Softened Variable Angle Truss Model for PC Beams under Torsion
Luis F. A. Bernardo,Catia S. B. Taborda,Jorge M. A. Andrade 한국콘크리트학회 2018 International Journal of Concrete Structures and M Vol.12 No.6
In a previous study, a new model (Generalized Softened Variable Angle Truss Model—GSVATM) was proposed to compute the global behavior of reinforced concrete beams under torsion, including for low loading stages. In this article, the GSVATM is extended to cover prestressed concrete (PC) beams under torsion, with longitudinal and uniform prestress. The changes in the GSVATM, in order to include the influence of the initial stress state due to prestress, the contribution of the prestress reinforcement after the decompression of concrete and the constitutive laws for prestress reinforcement, are presented, as well as the solution procedure. The theoretical predictions of the extended GSVATM are compared with experimental results of PC beams under torsion, where good agreement is observed in terms of stiffness, transition from the non-cracked stage to the cracked stage and also in terms of the maximum torque. It is also shown that when compared with the predictions of some codes of practice, namely for the cracking and ultimate torque, the estimates from the GSVATM are in general more accurate.
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Ultimate torsional behaviour of axially restrained RC beams
Luís F.A. Bernardo,Cátia S.B. Taborda,Jorge M.A. Andrade 사단법인 한국계산역학회 2015 Computers and Concrete, An International Journal Vol.16 No.1
This article presents a computing procedure developed to predict the torsional strength of axially restrained reinforced concrete beams. This computing procedure is based on a modification of the Variable Angle Truss Model to account for the influence of the longitudinal compressive stress state due to the axial restraint conditions provided by the connections of the beams to other structural elements. Theoretical predictions from the proposed model are compared with some experimental results available in the literature and also with some numerical results from a three-dimensional nonlinear finite element analysis. It is shown that the proposed computing procedure gives reliable predictions for the ultimate behaviour, namely the torsional strength, of axially restrained reinforced concrete beams under torsion.
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