摘要
通过对 2 7根两端偏心距不等的和 6根两端偏心距相等的铰支无侧移钢筋混凝土柱的单调加载试验 ,考察了柱两端偏心比、柱较大端偏心距以及柱长细比对细长钢筋混凝土柱二阶效应大小及分布规律以及对柱破坏位置和特征的影响。根据试验结果给出了在无侧移不等偏心距框架柱中考虑二阶效应特殊规律的 Cm 系数 (亦称“考虑端弯矩不等的影响系数”)建议式 ,该建议式反映了钢筋混凝土柱的非线性特点。试验结果证明美国ACI318设计规范取自美国钢结构设计规范的传统 Cm 系数表达式对钢筋混凝土柱是偏不安全的。
The monolithic loading tests on 27 hinged no sway reinforced concrete columns with asymmetric eccentricity, and 6 ones with symmetric eccentricity at two ends, are carried out. The effect of eccentricity ratio, the larger eccentricity at the column end, and the slenderness ratio on the second order effect, and damage locations and characteristics of slender RC columns are investigated. The tentative expression of Cm, which is called ‘Influential factor of asymmetric end moments’ in the framed column with asymmetric eccentricity of no sway frames, is presented. The non-linear characteristics of RC columns are taken into account in this expression. The experimental results show that the Cm expression in AC1318 of the United States give unconservative results. The expression presented in this paper can be used by revision of China Code of Reinforced Concrete Structures.
出处
《重庆建筑大学学报》
CSCD
2000年第z1期41-46,共6页
Journal of Chongqing Jianzhu University
基金
国家自然科学基金资助项目! ( 596780 35)
关键词
钢筋混凝土柱
无侧移框架
二阶效应
偏心距增大系数
reinforced concrete column
no sway frame
second-order effect
eccentricity amplifier
