在自重及恒载作用下,由于混凝土的徐变,预应力混凝土梁将产生随时间不断增加的长期变形,梁的徐变变形的精确计算,可采用“代换棱体法”。但对于单侧配筋预应力混凝土梁来说,可以回避“代换棱体法”这个较复杂的概念,用直接建立徐变变形的计算方法。由结构力学已知,梁的挠度按下式计算。(?)式中(?)——作用于计算挠度点沿挠度方向单位力产生于梁截面 x 处的弯矩;γ——在引起梁变形的外荷载作用下, Under dead weight and dead load, due to concrete creep, prestressed concrete beams will produce long-term deformation with increasing time, accurate calculation of creep deformation of the beam, the “Substitution Prisms Method.” However, for unilateral reinforced prestressed concrete beams, the more complicated concept of “Prism Transformation Method” can be avoided and the calculation method of creep deformation can be directly established. It is known from structural mechanics that the deflection of a beam is calculated as follows. (?) Where? (?) - acting on the calculation of deflection point along the deflection direction of the unit force generated in the beam section x at the bending moment; γ - beam deformation caused by the external load,