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本文给出了钢筋混凝土框架非线性二阶效应电算分析的基本思路及步骤,并以最基本的门式单元框架及封闭式单元框架为对象,系统分析了竖向及水平荷载、梁-柱线刚度比以及柱的细长度等因素对柱控制截面二阶弯矩的影响规律。并以修订后的《混凝土结构设计规范》中的偏心距增大系数η的计算公式为基点,给出了能较准确反映上述两类框架柱控制截面二阶弯矩的当量标准柱长度(计算长度)l_0,以及该当量长度随各影响因素变化的规律及其拟合公式。
In this paper, the basic ideas and steps of the nonlinear second-order effects computerized analysis of reinforced concrete frames are given. Taking the most basic portal unit frames and closed unit frames as objects, the vertical and horizontal loads and beam-columns are systematically analyzed. The influence of factors such as line stiffness ratio and the length of the column on the second-order bending moment of the column control section. The calculation formula of the eccentricity increase coefficient η in the revised “Specifications for Design of Concrete Structures” is taken as the base point, and the equivalent standard column length that can accurately reflect the second-order bending moments of the control cross sections of the above two types of frame columns is given. (Length) l_0, and the law of variation of the equivalent length with each influencing factor and its fitting formula.