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本文讨论了钢筋混凝土构件刚度计算中三个理论问题,即:(1)关于混凝土受压区边缘平均应变综合系数ζ;(2)钢筋计算应变ε_g和量测平均应变ε_g曲线的平行性关系;(3)根据这一关系对偏心受压构件钢筋应变不均匀系数φ计算公式的修正。对在使用荷载下系数ζ可取为常数及其在现行规范TJ10-74中的取值,根据混凝土弯曲应力与应变的关系曲线予以证明。文中还指出现行规范刚度公式所据以建立的几项前提和系数取值是协调一致的。
This paper discusses three theoretical problems in the calculation of the stiffness of reinforced concrete members, namely: (1) the comprehensive coefficient of the edge average strain in the compression zone of the concrete; (2) the parallel relationship between the calculated strain ε_g and the measured mean strain ε_g curve; (3) Based on this relationship, the correction formula for the steel bar non-uniform coefficient φ of eccentrically compressed components is revised. The coefficient ζ can be taken as a constant under the applied load and its value in the current specification TJ10-74 is proved by the curve of the bending stress and strain of the concrete. The paper also points out that the preconditions and coefficient values established by the current normative stiffness formula are consistent.