摘要
为了研究轴压矩形钢管再生混凝土柱在火灾作用下的力学性能,进行了3根矩形钢管再生混凝土柱抗火性能试验,获得了试件的温度-时间、变形-时间曲线,以及耐火极限。应用ABAQUS有限元程序建立了抗火分析模型,并与试验结果进行对比,利用验证过的模型分析了长细比、荷载比、再生骨料取代率、钢材屈服强度和混凝土强度等参数对轴向位移-时间关系和耐火极限的影响。结果表明:温度从钢管内壁至核心混凝土内部逐渐降低;试件在受火起始阶段出现轴向膨胀变形,然后膨胀变形逐渐减小,最后进入压缩段并达到耐火极限。随荷载比和长细比增大,耐火极限出现不同程度的减小;钢材屈服强度、混凝土强度及再生混凝土取代率对柱耐火极限影响较小。
In order to study the performance of regenerated recycled concrete filled steel tubular(RRCFST)columns with the axial compression in fire,three fire-resistant performance tests of regenerated recycled concrete filled steel tubular columns were carried out,and the temperature-time,deformation-time curve and fire endurance of the test piece were obtained.The fire resistance analysis model was established by the finite element software ABAQUS,and the model was compared with the test results.The effects of the parameters such as slenderness ratio,load ratio,recycled aggregate replacement rate,steel yield strength and concrete strength on the axial displacement-time relationship were analyzed by the validated model.The results show that the temperature gradually decreases from the inner wall of the steel pipe to the inner core of the core concrete;the axial deformation of the columns starts from the expansion section,and then the expansion deformation gradually decreases,and finally the member reaches the fire resistance.When the load ratio and the slenderness ratio increase respectively,the fire resistance limit will decrease to different extents.The yield strength,concrete strength and replacement ratio of recycled concrete have little effect on the fire endurance of the column.
作者
戴戌
毛小勇
DAI Xu;MAO Xiaoyong(School of Civil Engineering,SUTS,Suzhou 215011,China)
出处
《苏州科技大学学报（工程技术版）》
CAS
2020年第1期9-13,56,共6页
Journal of Suzhou University of Science and Technology（Engineering and Technology Edition）
基金
国家自然科学基金项目(51778396)。
关键词
矩形钢管再生混凝土柱
抗火性能试验
有限元分析
荷载比
长细比
regenerated recycled concrete filled steel tubular columns
fire resistance
finite element analysis
load ratio
slenderness ratio
