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Under the action of bending shear and torsion torsional ultimate strength of prestressed concrete box beam theory of dollars ...

Strength,[link widoczny dla zalogowanych], the less muscle damage, that is, e a -,, 2 ≤,[link widoczny dla zalogowanych], 2; the second failure mode, while the yield of longitudinal tendons,[link widoczny dla zalogowanych], concrete principal stress reaches the ultimate compressive softening of concrete, a strength of this To balance the damage, that is, e ≈ -, ≈, 2 a; third failure mode, the vertical tendons not yield, and principal stress of concrete has reached the limits of anti-softening of concrete, one,[link widoczny dla zalogowanych], compressive strength, this is the destruction of super-reinforced , that is, e <,, 2 a ~. Where is the yield strength of longitudinal reinforcement. P2 calculation and test of a comparison of the results of a series established by the above equation, it is easy to force composite prestressed concrete box girder torsional capacity calculations. First, assume a value, and then given a pre-T; from (9), type (14) and (19), is 1, can be by (6) Calculate T, if T and pre-specified range, with T + △ T is recalculated. If T is equal with the pre-given by,, equation (1), equation (2) and (9), is 2, from (11) (14) and (19) calculations, 2 a; this or as long as £ ≈, 2,2 a, one condition is satisfied, then the calculated T value is the ultimate strength of the torsional component, or re-calculation of assumed values. All of these work, for a specific component, the use of a computer programming terms, can be completed in an instant. The torsional capacity using this theoretical method, the literature 【6] 【7】's 24 box-section prestressed concrete members in bending under the action of shear and torsion torsion calculated ultimate bearing capacity. The calculated values obtained are compared with test results, as shown in the table. Experimental and theoretical values of the ratio of the mean = 1.037, standard deviation mouth = 0.152, coefficient of variation C = 0.147. Theoretical results shows good agreement with experimental results. 3 Conclusion of the proposed box girder prestressed concrete members under combined torsion force bearing capacity formula of high precision, is feasible, it is clear that this calculation method is also applicable to ordinary reinforced concrete beams. This method has the following characteristics: (1) strong theoretical foundation, not only on the basis of established equilibrium conditions, but also consider the compatibility condition and the concrete strain softening constitutive relation, by considering the crack between the concrete tensile stress contribution, for the concrete items torsional contributions to give a clear explanation. (2) conceptual clarity, considering the bending shear and torsion interaction relationship, and the power factor ratio (ratio of torsional bending, torsional shear ratio), prestressing degree, section size, reinforcement ratio and other factors affect each other. (3) wide range of applications to reinforced concrete and prestressed concrete of uniform components for processing. Not only for symmetrical prestressed reinforcement, also applies to non-symmetrical reinforcement; not prestressed reinforcement eccentricity limit the size and super. (4) damage to distinguish clearly, through the longitudinal reinforcement strain e. And concrete compressive stress value, able to twist two-and curved shape a certain level of damage judgments. As can be seen from Table 1, bending twisting commitment than the torsional strength of concrete has little effect, while the torsional shear is greater than the impact. When the torque Tr Uk Source No. 8T old strike / kN. Ik. N. . Some
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