【摘要】 首先采用直接由材料本构关系形成单元M N Φ本构矩阵的方法推导出钢筋混凝土构件的单元刚度矩阵 ,编制了可以同时考虑材料和几何双重非线性影响的有限元程序 ,与独立柱和框架柱的试验结果相比 ,计算结果吻合较好 ;然后 ,采用该分析程序对一榀二跨七层的规则框架算例进行分析 ,计算了各柱单元控制截面的二阶弯矩 ,并分析了二阶弯矩随各影响因素的变化规律 ;最后 ,以现行设计规范中标准柱偏心距增大系数的原型公式在本研究程序条件下的修正公式为基点 ,分析了所选算例各柱单元的计算长度随各影响因素的变化规律更多还原

【Abstract】 In this paper, the element stiffness matrixes of RC members were firstly derived, utilizing the M N Φ relations of elements formed directly from physical properties of material. Thus a computer program was developed, in which the influence of material non linearity and geometric non linearity were comprehensively taken into account. The results calculated by this program were found to be in good agreement with the experimental results of columns and frames. Thereafter, the nonlinear analytical computer program was used to analyze the varying laws of second order moment with respect to different influential factors in critical sections of columns in the example of seven story two bay RC frame. Based on the amendatory formula of the magnification coefficient for the eccentricity of standard column (hinged end column with equal end eccentricities) specified in the design code (GBJ10-89), appropriate formula and varying laws of the effective length of column members in the analyzed example frames with the influential factors have been investigated.更多还原