摘要
为了实现对多室式钢管混凝土T形柱轴压稳定性能的研究,进行6个中长柱试件及4个短柱对照试件的轴压试验,重点考察前者的破坏形态、荷载-变形关系及截面尺寸对承载力的影响。试验结果表明,中长柱的力学行为与短柱有较大不同,其破坏属于整体弯曲破坏,增大腹板高度对承载能力会产生有利影响。同时,将改进Mander模型后所得的混凝土本构关系引入有限元软件ABAQUS中,对试验进行了有限元模拟,其结果与试验结果吻合较好。在试验及有限元分析的基础上确定了中长柱与短柱之间的界限长细比,并对这一新型结构柱稳定承载力的计算方法进行了探讨,给出可供实际应用参考的计算公式。
In order to acquire the stability properties of multi-cell T-shaped concrete-filled steel tubular （MT-CFST） columns, axial compressive experiments of 6 intermediate long specimens and 4 stub specimens were presented. The failure modes, relationships between axial load and deformation and the effects of cross section dimensions on the bearing capacities of the specimens were investigated. It is demonstrated that the mechanical behaviors of MT-CFST middle long columns are different from stub columns. Their ultimate failure modes belong to buckling failure and the enhancement of web height could enhance the bearing capacities. A constitutive relationship of the concrete core is suggested by modifying Mander＇ s concrete model. Finite element analysis of the specimens is carried using ABAQUS and the calculation results are in good agreement with the experimental results. Based on the experiment and finite element analysis, the slenderness ratio limit between intermediate long columns and stub columns is suggested and subsequently a simplified formula for stable bearing capacities of MT-CFST columns is proposed.
出处
《土木工程学报》
EI
CSCD
北大核心
2012年第9期27-35,共9页
China Civil Engineering Journal
基金
国家自然科学基金(50578005)
关键词
钢管混凝土
中长柱
多室式T形截面
轴压
破坏状态
稳定系数
长细比
有限元
concrete-filled steel tube
intermediate long column
multi-cell T-section
axial compression
failure mode
stability coefficient
slenderness ratio
finite element method
