高强方钢管超高性能混凝土短柱轴压性能研究  

Axial Compressive Behavior of Square Ultrahigh-performance Concrete-filled High-strength Steel Tube Columns

作　　者：赖志超 董翠芬 林玉煌 王莹 陈宝春[1] 李文勃 LAI Zhi-chao;DONG Cui-fen;LIN Yu-huang;WANG Ying;CHEN Bao-chun;LI Wen-bo(College of Civil Engineering,Fuzhou University,Fuzhou 350108,Fujian,China;Shanghai Municipal Engineering Design Institute(Group)Co.Ltd.,Shanghai 200092,China)

机构地区：[1]福州大学土木工程学院,福建福州350108 [2]上海市政工程设计研究总院(集团)有限公司,上海200092

出　　处：《中国公路学报》2025年第3期343-353,共11页China Journal of Highway and Transport

基　　金：国家自然科学基金项目(51978170);福建省科学技术厅青年创新项目(2020J05126)。

摘　　要：高强方钢管超高性能混凝土构件在大跨桥梁、超高层建筑等工程中均有着广泛的应用前景。为研究高强方钢管超高性能混凝土短柱的轴压力学性能,设计制作了16根方钢管混凝土短柱,并对其开展轴压试验,研究了混凝土抗压强度、钢管屈服强度、截面宽厚比等参数对其轴压性能的影响。通过ABAQUS有限元软件对试件进行非线性有限元分析和参数分析,以明确高强方钢管超高性能混凝土轴压短柱的受力机理。研究结果表明:高强方钢管超高性能混凝土短柱轴压性能良好;提高混凝土抗压强度可显著提升轴压承载力和刚度,且对延性影响不大;提高钢材屈服强度可提升承载力,但对轴压刚度和延性的影响较小;减小截面宽厚比可提升轴压承载力、刚度和延性,并延缓局部屈曲和剪切破坏。最后,将已有试验统计数据和所得试验结果与中国规范GB 50936—2014、欧洲规范EC4(2004)和美国规范AISC 360-22中相关公式的计算结果进行对比,发现GB 50936—2014对高强方钢管超高性能混凝土短柱轴压承载力的预测偏差较大,欧洲规范EC4(2004)的预测不够安全,且无法考虑钢管局部失稳的影响;美国规范AISC 360-22的计算结果与试验结果较为接近,且考虑了钢管局部失稳的影响。Square ultrahigh-performance concrete-filled high-strength steel tubes(S-UCFSTs)exhibit significant potential for use in long-span bridges and super high-rise buildings.To investigate the axial compressive behavior of S-UCFST short columns,tests were conducted on 16 S-UCFST short columns.The effects of several parameters,including the compressive strength of concrete,yield stress of steel,and width-to-thickness ratio of the steel tube,on axial compressive performance were considered in this study.Nonlinear finite element and parametric analyses of the specimens were conducted using ABAQUS to investigate the mechanism of the S-UCFST short columns under axial compression.The results show that the S-UCFST short columns exhibit favorable axial compressive behavior.Increasing the compressive strength of concrete improves the axial compressive strength and stiffness but minimally affects the ductility.The axial compressive strength is improved by increasing the yield stress of steel,whereas the effects of stiffness and ductility are minor.Reducing the width-to-thickness ratio of the steel tube improves the axial compressive strength,stiffness,and ductility while delaying the occurrence of local buckling and shear failure in S-UCFST members.Finally,the existing statistics and experimental results were compared with theoretical results calculated according to Chinese code GB 50936—2014,European code EC4(2004),and American code AISC 360-22.The comparisons indicate that GB 50936—2014 presents a significant prediction bias for the axial compression strength of S-UCFST short columns.The predictions of European code EC4(2004)are not sufficiently safe and fail to account for the local buckling of the steel tube.The results calculated according to American code AISC 360-22 are more similar to the experimental results and consider the local-buckling effect of the steel tube.

关 键 词：桥梁工程 方钢管混凝土 轴压试验 超高性能混凝土 

分 类 号：U443.2[建筑科学—桥梁与隧道工程]