圆钢管废弃钢渣混凝土短柱轴压承载力计算方法  

Ultimate Strength Calculation of Circular Waste Steel Slag Concrete-filled Steel Tube Stub Columns under Axial Compression

作　　者：路林翰 任庆新[1] 张天贺 梁涛 LU Linhan;REN Qingxin;ZHANG Tianhe;LIANG Tao(School of Civil Engineering,Shenyang Jianzhu University,Shenyang,China,110168)

机构地区：[1]沈阳建筑大学土木工程学院,辽宁沈阳110168

出　　处：《沈阳建筑大学学报（自然科学版）》2023年第3期428-436,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);辽宁省教育厅基本科研项目(LJKMZ20220927)。

摘　　要：目的研究圆钢管废弃钢渣混凝土短柱轴压承载力的影响因素和计算方法,为废弃钢渣在结构工程中的应用提供理论依据。方法进行5组(共10个)圆钢管废弃钢渣混凝土短柱轴压性能试验,得到试件的破坏模态和荷载-位移曲线;量化钢渣骨料取代率和截面尺寸对试件轴压承载力和延性性能的影响;基于极限平衡理论和统一强度理论,得出圆钢管废弃钢渣混凝土轴压承载力计算公式的修正系数。结果钢渣骨料取代率由0增至50%、100%,圆钢管废弃钢渣混凝土柱的极限承载力变化在5%以内,取代率的影响可以忽略;截面直径由160 mm增至180 mm、200 mm,圆钢管废弃钢渣混凝土柱的极限承载力分别提高20.4%和54.6%;根据现有的相关计算方法对轴压极限承载力进行计算并修正,得出了笔者所提出的计算公式可准确预测圆钢管废弃钢渣混凝土的轴压承载力。结论圆钢管废弃钢渣混凝土短柱轴压构件的破坏模态与普通圆钢管混凝土短柱相似,废弃钢渣骨料可以取代天然骨料制备钢管废弃钢渣混凝土。To provide theoretical reference for the application of waste steel slag in structural engineering,the factors and calculation methods of circular waste steel slag concrete-filled steel tube columns on axial bearing capacity were studied.A total of 5 groups CFST stub columns with waste steel slag was carried out,with the failure mode and axial load-displacement curves obtained.Effects of replacement ratio of waste steel slag and cross-sectional dimensions on axial compressive capacity and ductility coefficient were investigated.Based on the ultimate equilibrium theory and the unified strength theory,the modified coefficients of calculation formula on axial bearing capacity of CFST stub columns with waste steel slag were proposed.The ultimate bearing capacity of CFST stub columns with waste steel slag varied within 5%and the effect of this was negligible when the replacement ratio of steel slag increases from 0%to 50%and 100%;with the increasing of cross-sectional dimensions from 160 mm to 180 mm and 200 mm,the ultimate axial strength of CFST stub column with waste steel slag increased by 20.4%and 54.6%respectively.According to the existing relevant calculation methods,the ultimate axial strength was calculated and modified,and the proposed formulae could accurately predict the axial compression bearing capacity of CFST with waste steel slag.The failure mode of CFST stub column with waste steel slag was similar to that of CFST stub column,the waste steel slag can replace natural aggregate to prepare CFST.

关 键 词：钢管混凝土 废弃钢渣混凝土 轴压试验 极限承载力 计算方法 

分 类 号：TU398.9[建筑科学—结构工程]