摘要
通过轴压试验,研究了形状记忆合金(SMA)条带对承载力及变形能力的影响。基于试验实测数据,利用ABAQUS建立有限元模型并进行了参数化分析,提出了预应力SMA条带约束混凝土柱轴向抗压强度的预测模型和本构模型。结果表明:(1)混凝土柱试件经预应力SMA条带约束后,不仅可以提高柱的轴压承载力,提高幅值在2.70%~17.17%,还能使约束柱具有良好的变形能力,峰值位移幅值提升可达50.25%,可有效改善其轴压性能。(2)模拟结果表明,数值模拟结果与试验值分析结果吻合良好,验证有限元模型的可靠性;确定了预应力大小为关键影响因素,较未施加预应力试件承载力可提高22.6%。(3)将提出的模型与数值模拟、试验值进行对比,比值均值为1.02;并与其他研究的试验数据进行验证,结果显示,95%的试验数据试验值与计算值误差都在±20%范围内,吻合程度较好。提出的应力-应变全曲线模型与试验结果吻合良好,能够准确描述预应力SMA条带约束混凝土柱在轴压作用下的受力变形特征。
The influence of SMA strips on it’s bearing capacity and deformation capacity was investigated through axial compression tests.Based on the experimental measurement data,a finite element model was established.Use ABAQUS to establish and conduct parametric analysis.A prediction model and constitutive model for the axial compressive strength of prestressed SMA strip constrained concrete columns have been proposed.The results show that:(i)After being restrained by pre-stressed SMA strips,concrete column specimens can not only have a higher axial compressive bearing capacity,with an increase amplitude of 2.70%—17.17%,but also have good deformation capacity.The peak displacement amplitude can be increased by 50.25%,which can effectively improve its axial compressive performance.(ii)The simulation results show that the numerical simulation results are in good agreement with the experimental analysis results,verifying the reliability of the finite element model.The magnitude of prestress is the key influencing factor,and the bearing capacity of the specimen can be increased by 22.6%compared with that without prestress.(iii)The model proposed here was compared with simulation and experimental values,with a mean ratio of 1.02,meanwhile,validated with experimental data from other research.95%of the experimental data showed an error of±20%between the experimental and calculated values,indicating a good degree of agreement.The proposed stress-strain full curve model is in good agreement with experimental results and can accurately describe the stress deformation characteristics of prestressed SMA strip constrained concrete columns under axial compression.
作者
徐立丹
杨懿
赵继涛
陈明
XU Lidan;YANG Yi;ZHAO Jitao;CHEN Ming(College of Civil Engineering,Inner Mongolia University of Science and Technology,Baotou 014010,Inner Mongolia,China;Inner Mongolia University Intelligent Construction and Operation Engineering Research Center,Baotou 014010,Inner Mongolia,China;Inner Mongolia Key Laboratory of Safety and Durability for Civil Engineering,Baotou 014010,Inner Mongolia,China;School of Civil and Architecture Engineering,Panzhihua University,Panzhihua 617000,Sichuan,China)
出处
《材料导报》
北大核心
2025年第24期177-187,共11页
Materials Reports
基金
国家自然科学基金(52468026)
2025年内蒙古自治区土木工程安全与耐久重点实验室项目(2025KYPT0113)
中央支持地方高校改革发展项目-土木工程提质培育学科项目(0404052507)
内蒙古科技大学基本科研业务费(2023YXXS217,2023YXXS218)。
关键词
形状记忆合金
轴向受压
混凝土柱
有限元模型
计算模型
shape-memory alloy
axial compression
concrete column
finite element model
computational model
