配钢管高强混凝土芯柱的异强组合短柱轴压性能

发布时间：2019-04-03 06:11

【摘要】：以套箍指标、钢管内外混凝土强度等级、钢管外围混凝土配箍率、组合柱纵筋总配筋率和组合柱截面含钢管混凝土率为主要参数,设计36根配钢管高强混凝土芯柱的异强组合短柱(SGCC)构件;借助ABAQUS有限元软件,选取合理的材料非线性本构模型及网格尺寸,建立18根试验试件的有限元模型并分析轴压性能,比较有限元数值解与试验数据;提取36根组合短柱应力—变形云图和轴力—应变全过程曲线,考察轴压承载力、弹性阶段刚度和延性等参数的变化规律;根据有限元数值解,引入轴压承载力折减因数,基于叠合原理建立SGCC轴压承载力简化计算公式。结果表明:SGCC钢管高强混凝土套箍指标、钢管外围混凝土配箍率和组合柱截面含钢管混凝土率对组合柱轴压承载力和延性影响显著。该结果为SGCC框架体系的工程应用提供指导。
[Abstract]:The main parameters are the hoop index, the concrete strength grade inside and outside the steel tube, the concrete reinforcement ratio around the steel tube, the total reinforcement ratio of the longitudinal reinforcement of the composite column and the concrete-filled steel tube ratio of the section of the composite column. 36 (SGCC) members with high strength concrete-filled steel tube (CFST) core columns were designed. With the help of ABAQUS finite element software, select reasonable material nonlinear constitutive model and mesh size, set up the finite element model of 18 test specimens and analyze the axial compression performance, compare the finite element numerical solution with the test data. The stress-deformation cloud diagram and axial force-strain curve of 36 composite short columns were extracted, and the variation rule of axial compression bearing capacity, stiffness and ductility of elastic stage were investigated. According to the numerical solution of finite element method, the reduction factor of bearing capacity under axial compression is introduced, and a simplified formula for calculating the bearing capacity of SGCC axial compression is established based on the superposition principle. The results show that the SGCC steel tube high-strength concrete hoop index, the ratio of concrete-filled steel tube (CFST) and concrete-filled steel tube (CFST) cross-section have significant effects on the bearing capacity and ductility of composite columns under axial compression. The results provide guidance for the engineering application of SGCC framework system.
【作者单位】：东北石油大学黑龙江省防灾减灾工程与防护工程高校重点实验室;南京工程学院建筑工程学院;
【基金】：国家自然科学基金项目(51178087);国家自然科学基金东北石油大学校培育基金项目(NEPUPY-1-16) 黑龙江省自然科学基金面上项目(E201336) 黑龙江省级领军人才梯队后备带头人资助项目(RCHB-6) 中国石油科技创新基金项目(2016D-5007-0608) 中国石油和化学工业联合会科技指导计划项目(2017-11-5) 东北石油大学校级研究生创新科研项目(YJSCX2016-031NEPU) 黑龙江省教育厅科研专项经费东北石油大学优势科研方向凝练基金项目(2016YSFX-02)
【分类号】：TU398.9

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