基于预应力混凝土受弯构件正截面承载力的计算原理,采用MathCAD软件进行编程,精确计算任意截面的预应力及非预应力混凝土构件的正截面受弯承载力。本文以箱形截面梁为例,对编程方法做了说明,并采用大型通用有限元软件ANSYS创建实体模型,进行了非线性有限元计算,证明了MathCAD编程计算方法的实用性和有效性。 Based on the calculation principle of the normal section bearing capacity of prestressed concrete flexural members, MathCAD software was used to program the flexural bearing capacity of prestressed and non-prestressed concrete members with arbitrary cross section accurately. In this paper, the box beam is taken as an example to illustrate the programming method. The solid model is created by the large-scale finite element software ANSYS, and the nonlinear finite element calculation is carried out. The computational method of MathCAD is proved to be practicable and effective.