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本文在指出各国设计规范对钢筋砼框架柱计算长度取值方面存在的问题之后,给出了确定框架各柱单元控制截面二阶弯矩所用的当量长度的确切含义。随后用经过试验验证的非线性分析程序对规则框架算例中各柱单元控制截面的二阶弯矩随各影响因素的变化规律进行了系列计算。在此基础上,以我国《混凝土结构设计规范》中标准柱偏心距增大系数的原型公式为基点,求得所选算例中各个柱单元的当量长度随各影响因素的变化规律及其拟合公式,并得出了我国《混凝土结构设计规范》(GBJ 10—89)中的框架柱计算长度取值,在本文所计算的范围内均有不同程度偏大的初步结论。
In this paper, after pointing out the problems existing in the design specifications for the calculation of lengths of reinforced concrete frame columns in the design specifications of various countries, the exact meaning of the equivalent length used to determine the second-order bending moment of the control section of each column element of the frame is given. Afterwards, a series of calculations of the second-order bending moments of the control sections of each column unit in the regular frame example with the influencing factors were performed using the experimentally verified nonlinear analysis program. Based on this, based on the prototype formula of the increase coefficient of standard column eccentricity in China’s “Specifications for Design of Concrete Structures” as the starting point, the variation law of the equivalent length of each column element with each influencing factor in the selected example is obtained. Combining the formulas, we obtained the preliminary values of the calculated lengths of the frame columns in China’s “Code for the Design of Concrete Structures” (GBJ 10-89), and all of them have been slightly different in the range calculated in this paper.