双偏压长扁柱偏心距放大系数的简化估计方法  

A Simplified Estimation Method of the Eccentricity Amplification Coefficient of the Long Flat Column Subject to Bi-directional Eccentric Compression

作　　者：马泽峰 许建立[2] MA Zefeng;XU Jianli(East China Architectural Design&Research Institute Co.,Ltd.,Shanghai 200011,China;Shanghai Institute of Architectural Design&Research Co.,Ltd.,Shanghai 200041,China)

机构地区：[1]华东建筑设计研究院有限公司,上海200011 [2]上海建筑设计研究院有限公司,上海200041

出　　处：《结构工程师》2023年第2期1-10,共10页Structural Engineers

摘　　要：截面高宽比在1~4之间的柱定义为扁柱。扁柱截面两向尺寸差距越大,两主轴方向长细比相应相差越大。当柱长度较长时,这种差距会导致不同的轴力作用效果,若同时考虑加载角度、轴力水平、轴力偏心距、截面高厚比以及材料非线性本构关系的影响,扁柱的二阶效应问题将变得更为复杂。以单偏压长柱考虑二阶效应的偏心距放大系数η理论为基础,借助OPENSEES有限元分析程序,对上述影响因素进行大样本、变参数、多水平的拟合分析,并与试验结果进行对比验证,据此定量统计、拟合各参数对偏心距放大系数η的影响。得到的η拟合公式可作为双偏压长扁柱的设计依据。Due to the large difference of the cross-section dimensions in the two main axis direction,slenderness ratios of the flat column(which cross-sectional aspect ratio between 1 and 4)are correspondingly different.When the column height continues to increase,this gap will result in large difference in axial force effects.Considering the influence of different loading angles,axial force levels,eccentricity,cross-sectional aspect ratios and the nonlinear constitutive relationship of the material,the problem of the second-order effect of the flat column will become more complicated.Based on the eccentricity magnification coefficient η method of the one-direction eccentric compression,a large amount the samples with variable parameters and multilevels was analyzed using OPENSEES,which was also calibrated with experiment result.Moreover,the abovementioned influencing factor was quantified in theηformula by statistics fitting analysis.The obtainedηformula can be used in the design of long flat columns subject to bidirectional eccentric compression.

关 键 词：扁柱 二阶效应 偏心距放大系数 OPENSEES 

分 类 号：TU375.3[建筑科学—结构工程]