摘要
震害表明,高层建筑中轴压比较大的钢筋混凝土柱变形能力较差,为提高柱的变形能力,并改善结构的抗震性能,采用复合钢管混凝土柱是一种有效的方式。本文通过分析钢管混凝土强度提高的机理,对复合钢管约束混凝土的实际套箍系数计算提出建议。基于已有的复合钢管混凝土柱试验,建立了复合钢管混凝土柱的有限元模型,并验证了有限元模型的合理性。在此基础上,对影响复合柱变形能力的主要因素如轴压比、径宽比等进行了参数分析。建立了复合柱屈服位移角和极限曲率的计算公式,通过数据回归分析,得到了相关参数的取值,可用于计算复合柱的屈服位移角和极限位移角,为工程抗震设计提供参考。
It is shown from earthquake damages that deformation capacity of reinforced concrete columns with high axial compression ratio in high-rise building is relatively low. In order to improve the deformation capacity of the columns and improve the seismic performance of the structures,it is an effective way to adopt the composite-sectioned concrete filled steel tubular columns. The calculation of confinement coefficient of composite-sectioned concrete filled steel tubular columns is suggested through the analysis of the mechanism of the increase of strength of concrete-filled steel tube. Based on the existing test of composite-sectioned concrete filled steel tubular columns,the finite element models of composite-sectioned concrete filled steel tubular columns are established by general nonlinear finite element software ABAQUS. On the basis of verified rationality of the finite element model,analysis of the influence of design nominal axial compression ratio,diameter width ratio and some other parameters to the deformation ability of composite-sectioned concrete filled steel tubular column are conducted. The calculation formula of the yield displacement angle and ultimate curvature of the composite column are established. Through the data regression analysis,the values of relevant parameters can be obtained,which can be used to calculate the yield displacement angle and ultimate displacement angle of the composite column and can provide reference for the engineering seismic design.
作者
尹华伟
周洁
Yin Hua-wei;Zhou Jie(College of Civil Engineering, Hunan University, Changsha 410082, China)
出处
《工程抗震与加固改造》
北大核心
2018年第3期22-30,47,共10页
Earthquake Resistant Engineering and Retrofitting
关键词
复合钢管混凝土柱
变形能力
有限元
计算公式
composite-sectioned concrete filled steel tubular column
deformation ability
finite element
calculation formula