截面模量又叫截面抵抗矩。被弯曲构件的横截面绕其中性轴的惯性矩除以由中性轴到截面最外边缘的距离。截面抵抗矩（W）就是截面对其形心轴惯性矩与截面上最远点至形心轴距离的比值。
一个厘米截面的特性称为单位特性，即单位截面模量和单位截面惯性矩。
The properties of these one centimetre sections are called unit properties, that is unit section modulus and unit moment of inertia.
抗弯刚度的概念是材料切线模量和截面对中和轴的惯性矩的乘积。
The bending stiffness of elastoplastic member is product of tangent elastic modulus of material and inertia moment of the section.
构件预应力局部影响区与混凝土弹性模量，梁截面尺寸等因素有关。
The part influencing area of prestressing force is related to such factors as concretes elastic ratio, beams sectional dimension and so on.
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