【摘要】 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。更多还原

【Abstract】 This paper presents an accurate and practical method for theoretical analysis of prestressed concrete beams reinforced compos-itely with tendons and non-prestressed steel ( including section steel ) subjected to prestress and long-term loading. This method can be used to compute the stresses or long-term prestress losses in any point of the beam section at arbitrary time.The method is taking account of the interaction of shrinkage, creep of concrete, and relaxation of tendons, and setting equilibrium equations for different layers of tendons, As for the stress and strain relation of concrete and tendons in consideration of relaxation of shortened length of tendons, by using the physical equation in creep theory and compatibility of deformation, the general solution is obtained with solving linear algebra equations.更多还原