摘要
目的研究加劲型方钢管混凝土柱在双向偏心荷载作用下的力学性能,为实际工程的应用与相关试验研究提供理论依据.方法在有限元验证的基础上,研究加劲肋厚度、偏心距、偏心角以及长细比的变化对于试件承载力、抗弯刚度、延性的影响.结果在双向偏心荷载作用下,试件腔体内有加劲型与无加劲肋的钢管混凝土柱均发生挠曲变形;随着加劲肋厚度的增加,承载力逐渐提高,但提高幅度逐渐逐渐减小,且延性逐渐降低;随着偏心距的增大,试件承载力及刚度大幅度降低;改变偏心角对于承载力、刚度及延性几乎无影响;增加长细比使得试件由强度破坏逐渐变为失稳破坏,承载力与刚度均下降,但延性增加.结论加劲型钢管混凝土柱在双向偏心荷载作用下具有足够的安全储备,延性满足抗震要求.
The purpose of this paper is to do research on mechanical behavior of concrete-filled square steel tubular columns stiffened with Reinforced ribs under bidirectional eccentric load,which provides a theoretical basis for practical engineering application and related experimental research.Based on the finite element verification,the effects of reinforced ribs thickness,eccentricity,the load angle and slenderness ratio on the bearing capacity,flexural rigidity and ductility of the specimens were studied.Under the action of two-way eccentric load,both the stiffened and non-stiffened concrete-filled steel tubular columns in the specimen cavity are bending deformation.Through parameter analysis,it is found that with the increase of the thickness of the stiffener,the bearing capacity is gradually increased,but the increasing range is gradually decreasing,and the ductility is gradually reduced.With the increase of the eccentricity,the bearing capacity and stiffness of the specimen are greatly reduced;The eccentric angle has almost no influence on the bearing capacity,stiffness and ductility.Increasing the slenderness ratio makes the specimen gradually change from strength failure to instability failure,and the bearing capacity and stiffness decrease,but the ductility increases.The stiffened concrete-filled steel tubular column has sufficient safety reserve under the action of bidirectional eccentric load,and the ductility meets the seismic requirements.
作者
任德斌
张正涛
李泊飞
郭兴野
杨倩怡
REN Debin;ZHANG Zhengtao;LI Bofei;GUO Xingye;YANG Qianyi(School of Civil Engineering,Shenyang Jianzhu University,Shenyang,China,110168;School of Environmental Engineering,Wageningen University,Wageningen Netherlands,6078PB)
出处
《沈阳建筑大学学报（自然科学版）》
CAS
CSCD
北大核心
2020年第3期421-428,共8页
Journal of Shenyang Jianzhu University：Natural Science
基金
国家自然科学基金项目(51678373)。
关键词
加劲肋
钢管混凝土柱
双向偏压
挠度
延性系数
reinforced ribs
concrete-filled square steel tubular columns
biaxial eccentric compression
deflection
ductility coefficient
作者简介
任德斌(1960-),男,教授,主要从事组合结构方面研究.
