摘要
目的通过研究找到最适合空心钢管混凝土轴压短柱的混凝土本构关系模型.方法选取6种常用的混凝土本构关系模型,结合已有试验结果,应用有限元软件ABAQUS建立模型进行验证,找出适合的混凝土本构关系.改变钢材强度、钢管壁厚、混凝土强度、空心率等参数,研究不同参数对混凝土力学性能影响.结果随钢管屈服强度、钢管壁厚和空心率的增大,混凝土分担的荷载减小;随混凝土强度的提高,混凝土分担的荷载增加.对于空心钢管混凝土轴压短柱,μe<0.24时,其混凝土本构关系可采用改进后的模型MC7;0.24≤μe≤0.35时,可采用模型MC6;μe>0.35时,可采用模型MC1或MC2.结论采用改进后混凝土本构关系的空心钢管混凝土轴压短柱有限元分析结果与试验结果吻合良好.
Through research,the most suitable constitutive model of concrete for hollow concrete filled steel tubular(CFST)short columns under axial compression is found.Six commonly used constitutive models of concrete are selected,combined with the existing test results,the model is established by using the finite element software ABAQUS to verify,and the suitable constitutive relationship of concrete is found.The parameters such as steel strength,steel tube wall thickness,concrete strength and hollow rate are changed.The influence of different parameters on the mechanical properties of concrete are studied.With the increase of steel pipe yield strength,steel pipe wall thickness and hollow ratio,the load shared by concrete decreases;with the increase of concrete strength,the load shared by concrete increases.For the CFST short column under axial compression,whenμe<0.24,model MC7 can be used as concrete constitutive relationship;when 0.24≤μe≤0.35,the model MC6 can be used.Whenμe>0.35,model MC1 or MC2 can be used.The finite element analysis results of CFST short columns with improved concrete constitutive relation are in good agreement with the test results.
作者
杨志坚
韩嘉明
杨军彩
李帼昌
YANG Zhijian;HAN Jiaming;YANG Juncai;LI Guochang(School of Civil Engineering,Shenyang Jianzhu University,Shenyang,China,110168;Liaoning International Engineering Consulting Center Co.Ltd.,Shenyang,China,110000)
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429-438,共10页
Journal of Shenyang Jianzhu University：Natural Science
基金
国家自然科学青年基金项目(51808353)
辽宁省高等学校创新人才项目(LR201707)
沈阳市中青年科技创新人才支持计划项目(RC180270)。
关键词
荷载分担
本构关系
空心率
屈服强度
钢管壁厚
load-sharing
constitutive relation
hollow ratio
yield strength
steel tube wall thickness
