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提出了普遍适用的无粘结筋应力增量的计算方法,用等效荷载来表示无粘结筋的作用,既满足纵向变形协调条件又满足梁截面弯矩-轴力-曲率关系。计算了对称和不对称加载的无粘结预应力连续梁的应力增量。计算表明对称加载的应力增量与回归公式的计算值吻合良好;不对称加载的应力增量低于相应的对称加载值,两者的比值近似等于两种加载产生的线弹性变形的比值,约为0.55~0.75。
The calculation method of unbonded tendon stress increments is put forward. The equivalent load is used to represent the effect of unbonded tendons, which not only satisfies the coordination condition of longitudinal deformation but also satisfies the relationship of moment - axial force - curvature of beam section. The stress increment of unbonded prestressed continuous beams with symmetrical and asymmetric loading was calculated. The calculation shows that the increment of stress is in good agreement with the calculated value of regression equation. The increment of stress in asymmetric loading is lower than the corresponding symmetrical loading value, and the ratio of them is approximately equal to the ratio of linear elastic deformation 0.55 ~ 0.75.