摘要
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。
This paper points out problems existing in the determination of the effective length of reinforced concrete frame columns adopted in current concrete structure design codes of various countries and clarifies the correct implication of equivalent length which determines the second order moment in critical sections of the column members. A nonlinear analytical computer program,which has been verified by experiments,is 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 frames.Based on the original formula of the magnification coefficient for the eccentricity of standard column ( hinged end column with equal end eccentricities ) specified in China's concrete structure design code,(GBJ 10-89 ) , appropriate formulas and varying laws of the equivalent length of column members in the analyzed example frames with the influential factors have been obtained. Moreover, a rudimentary conclusion that the effective length of frame columns specified in the code seems to be greater in varying degrees in the examples analyzed (?)as also been acquired in the paper.
出处
《建筑结构学报》
EI
CAS
CSCD
北大核心
1992年第2期11-20,共10页
Journal of Building Structures
