在钢筋混凝土结构计算中,受弯和偏心受压构件的正截面强度计算是最基本的计算。采用平截面假定建立承载能力计算模型,其概念明确,逻辑性强,但必须可靠地掌握钢筋的应力一应变特性。目前许多国家的设计规范中,有关钢筋混凝土构件正截面强度的计算都采用平截面假定,并给定强度极 In the calculation of reinforced concrete structures, the calculation of the normal section strength of bent and eccentric compression members is the most basic calculation. The calculation model of the bearing capacity is established using the flat section assumption. The concept is clear and the logic is strong. However, the stress-strain characteristic of the steel bar must be reliably grasped. In the design specifications of many countries at present, the calculation of the normal section strength of reinforced concrete members adopts the flat section assumption and gives the strength