中空夹层钢管混凝土构件轴压性能有限元分析  

Finite element analysis of axial compression performance of concrete-filled double skin steel tube

作　　者：张晓燕 郜致峣 白鹏坤 刘世明 ZHANG Xiaoyan;GAO Zhiyao;BAI Pengkun;LIU Shiming(Internationa Joint Research Lab for Eco-building Materials and Engineering of Henan,North China University of Water Resources and Electric Power,Zhengzhou 450045,China;School of Civil Engineering and Communication,North China University of Water Resources and Electric Power,Zhengzhou 450045,China)

机构地区：[1]华北水利水电大学河南省生态建材工程国际联合实验室,河南郑州450045 [2]华北水利水电大学土木与交通学院,河南郑州450045

出　　处：《混凝土》2024年第4期115-121,共7页Concrete

基　　金：国家自然科学基金(51508189);河南省科技攻关项目(232102321079,232102321080);长安大学中央高校基本科研业务费专项资金(300102219310)。

摘　　要：为探明中空夹层钢管混凝土(CFDST)构件轴压性能的影响因素,在已有钢管混凝土柱轴压试验基础上,构建数值分析模型,开展长径比、空心率、内钢管壁厚、夹层混凝土抗压强度等参数对中空夹层钢管混凝土构件轴压性能的影响规律的研究。研究结果表明:研究参数范围内,轴压极限承载力随内钢管壁厚、夹层混凝土强度的增大,空心率、长径比的减小而增大。内钢管壁厚增大1 mm,轴压极限承载力提高2.9%~3.7%,承载力增长系数增大约0.7%;混凝土强度从C40增加到C90,圆截面试件轴压承载力增大了68%;方截面试件轴压承载力增大了53%;空心率每增大0.1,轴压极限承载力降低3.4%~8.7%,承载力增长系数减小约5%;圆截面试件长径比从2.2增大到7.2,承载力下降了3%。方截面试件长径比从2.2增大到5.7,承载力下降10%。长径比对构件的极限承载力影响,明显低于空心率、内钢管壁厚和内填混凝土强度对构件极限承载力的影响程度。随着试件长径比的增加,试件承载力峰值有所下降,但其承载力达到峰值时的位移量不断增大,表明构件延性有所提高。随内填混凝土强度的提高,试件的承载力峰值和达到峰值时的位移都有所提高,说明增大内填混凝土强度在提高钢管混凝土承载力的同时还能改善试件的延性性能。In order to build a numerical analysis model for a hollow concrete-filled double steel tube(CFDST)component with proven axial compression performance,the axial compression test for a concrete-filled steel tube column,the rate of the hollow steel tube wall thickness,and sandwich concrete compressive strength parameters on the hollow interlayer steel pipe concrete component were all taken into consideration.The research findings show that,within the parameter range,the axial compressive ultimate bearing capacity decreases with a decrease in the length to diameter ratio but increases with an increase in the steel tube wall thickness,sandwich concrete strength,and hollow ratio.The axial compression bearing capacity increases from 2.9%to 3.7%for every mm increase in the steel′s inner wall thickness,giving the bearing capacity a growth factor of roughly 0.7%.Additionally,increasing the concrete strength from C40 to C90 results in an increase in the axial compression bearing capacity of 68%for circular cross-section specimens and 53%for square-section specimens.Additionally,the axial compressive ultimate bearing capacity increases from 3.4%to 8.7%for every 0.1 increase in the hollow ratio,with a corresponding decrease in the bearing capacity growth coefficient of about 5%.Additionally,the bearing capacity of circular cross-section specimens decreases by 3%when the length to diameter ratio is increased from 2.2 to 7.2,whereas the bearing capacity of square cross-section specimens decreases by 10%when the ratio is increased from 2.2 to 5.7.It is important to note that compared to the hollow ratio,steel tube wall thickness,and concrete strength,the aspect ratio has a much smaller impact on the final bearing capacity of the components.Additionally,a higher length-to-diameter ratio of the specimens results in a lower peak capacity but a higher bearing capacity at the peak displacement,suggesting improved member ductility.The bearing capacity of concrete-filled steel tubes and the ductility performance of the specimens are

关 键 词：中空夹层钢管混凝土 有限元 承载力 轴压性能 空心率 延性 

分 类 号：TU528.7[建筑科学—建筑技术科学]