摘要
目的 基于方中空夹层钢管混凝土叠合长柱轴压性能有限元分析,阐述轴压长柱受力状态,提出轴压承载力计算方法。方法 建立并验证方中空夹层钢管混凝土叠合长柱有限元模型,定义荷载-变形曲线上6个力学特征点,分析不同特征点处柱中部截面应力分布。研究材料强度、配筋率、空心率、截面径宽比、钢管径厚比及长细比等因素对叠合长柱轴压性能的影响。运用叠加法和折减法计算长柱轴压稳定承载力。结果 方中空夹层钢管混凝土叠合长柱力学性能良好,轴压性能受外钢管径厚比、外部混凝土强度以及长细比影响显著;综合叠加法与折减法计算的叠合长柱轴压承载力与有限元计算结果之比的平均值和标准差分别为1.013和0.038。结论 方中空夹层钢管混凝土叠合长柱具有较好的轴压性能,基于叠加与折减理论提出的计算公式可较好地计算其轴压承载力。
Finite-element models of the axial compressive behavior of square hollow concrete-encased CFDST(concrete-filled double-skin steel tubular) composite slender column are established and benchmarked, to explore the mechanical behavior and the main influence factors under axial compression, based on which the calculate procedures are proposed to predict the bearing capacity.Six characteristic points were defined on the typical specimen′s load-deformation curve to analyze the stress state on each characteristic point;the influence of material strength, reinforcement ratio, hollow ratio, diameter-width ratio, diameter-thickness ratio and slenderness ratio on the bearing performance were quantified;finally the bearing capacity was calculated using both superposition and reduction method, and compared with finite element results.The results showed that square hollow concrete-encased CFDST composite slender columns exhibited good axial bearing behavior, and the diameter-thickness ratio and concrete strength and the slenderness ratio were the main influence factors on the axial bearing behavior;the design procedures based on superposition and reduction principal could provide reasonable predictions of the axial bearing capacity, with the average value and standard deviation between the calculated and FE results of 1.013 and 0.038 respectively.
作者
李明伦
任庆新
王庆贺
丁纪楠
LI Minglun;REN Qingxin;WANG Qinghe;DING Ji′nan(School of Civil Engineering,Shenyang Jianzhu University,Shenyang,China,110168)
出处
《沈阳建筑大学学报（自然科学版）》
CAS
北大核心
2023年第1期35-43,共9页
Journal of Shenyang Jianzhu University：Natural Science
基金
国家自然科学基金项目(51808351)
辽宁省“兴辽英才计划”项目(XLYC1902027)
辽宁省重点研发计划项目(2020JH2/10300110)
住房和城乡建设部科学技术计划项目(2019-K-054)
辽宁省博士科研启动项目(2019-BS-193)
沈阳市中青年科技创新人才支持计划项目(RC200144,RC200143)。
关键词
中空夹层钢管混凝土
叠合长柱
有限元
轴压性能
轴压承载力
concrete-filled double-skin steel tube
composite slender column
finite element modeling
axial compressive performance
bearing capacity
