摘要
目的研究高温下圆钢管再生混凝土中长柱偏压力学性能。方法在已有试验的基础上,通过ABAQUS有限元软件建立模型,对照分析常温与高温下圆钢管再生混凝土偏压柱的受力全过程,以及不同受火时间、再生混凝土取代率、长细比、偏心距、含钢率对高温下圆钢管再生混凝土柱力学性能的影响。结果圆钢管再生混凝土偏压中长柱在高温下的承载能力大幅度降低,构件的弯曲部位较常温下降低约为1/6柱高;受火时间越长,构件的极限承载力越低;构件的极限承载力及初始刚度随着再生混凝土取代率、长细比和偏心距的增大而减小、随着含钢率的增大而增大。结论在工程设计中,对重要的柱建议采用较小的再生混凝土取代率,并适当增大其含钢率;同时应控制柱的长细比和偏心距,防止柱跨中挠度过大。
In order to study the mechanical properties of recycled concrete-filled circular steel tubular medium and long columns under eccentric compression at high temperature,models are established through ABAQUS finite element software on the basis of existing experiments in this paper,and compares and analyzes the whole process of the force of circular steel tube recycled concrete columns at room temperature and high temperature under eccentric compression,and the effects of different fire time,recycled concrete replacement rate,slenderness ratio,eccentricity,steel content on the mechanical properties of circular steel tube recycled concrete columns under high temperature are also discussed.The bearing capacity of recycled concrete filled circular steel tubular columns under eccentric compression at high temperature greatly reduced,and the bending point of the members is about 1/6 of the column height lower than that at normal temperature,the ultimate bearing capacity decreases with the fire time increasing,the bearing capacity and the initial stiffness decreases with the recycled concrete replacement rate,the slenderness ratio and the eccentricity increasing,increases with the steel content increasing.In engineering designing,it is suggested that the recycled concrete replacement rate should be at a low level and the steel content should be at an appropriately high level for some important columns,at the same time,the slenderness ratio and eccentricity of the column should be controlled to prevent excessive deflection in the middle of the span.
作者
许峰
翁瑞
张婷
许伟
XU Feng;WENG Rui;ZHANG Ting;XU Wei(School of Civil Engineering,Shenyang Jianzhu University,Shenyang,China,110168;Tianyou Architectural Design Co.Ltd.,Ji′nan Branch,Ji′nan,China,250000)
出处
《沈阳建筑大学学报（自然科学版）》
CAS
CSCD
北大核心
2022年第3期418-426,共9页
Journal of Shenyang Jianzhu University：Natural Science
基金
国家自然科学基金项目(51938009)
科技部项目(2017YFC0703407-02)。
关键词
钢管再生混凝土柱
高温
有限元分析
极限承载力
初始刚度
recycled concrete filled steel tubular column
high temperature
finite element analysis
ultimate bearing capacity
initial stiffness
