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本文提供了钢筋(包括劲性骨架)混凝土梁承受预应力及长期荷载作用下精确而实用的理论分析方法及其通解,可用于计算任意时间梁截面上任意位置的应力值(长期预应力损失值)。 本方法的特点是将混凝土的收缩、徐变及预应力筋松弛三者的相互影响同时考虑,分层建立平衡方程,而对混凝土和预应力筋的应力应变关系运用徐变理论的物理方程,通过变形协调关系,计入预应力筋在变长度下的松弛,建立方程组,用线性代数获得通解。 文中附有计算例题。
This paper provides an accurate and practical theoretical analysis method and general solution of reinforced concrete (including stiff skeleton) concrete beams subjected to prestress and long-term loading. It can be used to calculate the stress value of any position on the beam section at any time (long-term prestress loss value). ). The characteristic of this method is to consider the interaction of shrinkage, creep and prestressing tendons relaxation of concrete simultaneously, and to establish the equilibrium equation in layers, and to apply the physical equation of creep theory to the stress-strain relationship between concrete and prestressed tendons. Through the deformation coordination relationship, the relaxation of the prestressed tendons under variable length is taken into account, the equations are established, and the general solution is obtained by linear algebra. Examples of calculations are attached to the text.