双不锈钢管约束海水海砂混凝土柱轴压试验及承载力计算模型  

Axial Compressive Test and Capacity Model of Seawater and Sea-sand Concrete Columns Confined by Double-Layered Stainless Steel Tube

作　　者：郑开启 周思源 魏洋[1,2] 白学洋 王天杰 ZHENG Kaiqi;ZHOU Siyuan;WEI Yang;BAI Xueyang;WANG Tianjie(College of Civil Engineering,Nanjing Forestry University,Nanjing,China,210037;Jiangsu Province Engineering Research Center of Highway Intelligent Detection and Low-carbon Maintenance,Nanjing Forestry University,Nanjing,China,210037;Key Laboratory of Concrete and Pre-stressed Concrete Structure of Ministry of Education,Southeast University,Nanjing,China,210096)

机构地区：[1]南京林业大学土木工程学院,江苏南京210037 [2]江苏省公路智能检测与低碳养护工程研究中心,江苏南京210037 [3]混凝土及预应力混凝土结构教育部重点实验室,江苏南京210096

出　　处：《沈阳建筑大学学报（自然科学版）》2024年第3期450-460,共11页Journal of Shenyang Jianzhu University：Natural Science

基　　金：国家自然科学基金项目(52108150);江苏省重点研发计划项目(BE2020703);中国博士后科学基金项目(2021M691606)。

摘　　要：目的 研究双不锈钢管约束海水海砂混凝土柱(DSTSCC)试件的轴压性能、破坏形态和轴压承载力计算模型,为该类构件的轴压承载力计算提供试验和理论研究参考。方法 对24个DSTSCC试件进行轴压试验,分析外管壁厚、芯管壁厚和芯管直径等参数对其破坏形态、应力-应变曲线和承载力的影响规律。结果 双不锈钢管约束试件的破坏形态以腰鼓型破坏为主;由于不锈钢受拉本构无明显的屈服台阶,可以持续地约束核心混凝土,试件应力-应变曲线无明显的下降段,表现出较好的延性特征;随外管壁厚增大,轴压承载力可提高6%~25%;随芯管壁厚增大,轴压承载力可提高3%~20%;随芯管直径增大,轴压承载力呈现为先提高后降低的趋势。结论 基于试验破坏机理分析和理论分析,所建立DSTSCC试件的轴压承载力计算模型相较于既有承载力计算模型,具有更好的适用性。The axial compression behavior,failure mode,and axial compression capacity model of seawater and sea-sand concrete columns confined by double-layered stainless steel tube(DSTSCC)are studied to provide experimental and theoretical basis for evaluating the axial compression behavior of such components.24 DSTSCC specimens were subjected to axial compression tests,considering the influence of parameters such as outer tube thickness,core tube thickness,and core tube diameter on their failure mode,stress-strain curve and axial compression capacity.The test results indicate that:The main failure mode of the DSTSCC specimen is waist drum-shaped failure;As there is no obvious yield terrace in the tensile constitutive model of stainless steel,it can continuously restrain the core concrete,and the stress-strain curve of the specimen has no obvious descending part,showing good ductility characteristics;As the thickness of the outer tube increases,the axial compression capacity can be increased by 6%to 25%,and as the thickness of the core tube increases,the axial compression capacity can be increased by 3%to 20%;As the diameter of the core tube increases,the axial compression capacity shows a trend of first increasing and then decreasing;Based on the analysis of experimental failure mechanism and theoretical analysis,a formula for calculating the axial compression capacity of DSTSCC specimens was established.The validation results of experimental data show that the proposed formula has better applicability compared to other calculation models.

关 键 词：不锈钢管 约束混凝土柱 轴压性能 轴压承载力 

分 类 号：TU398.9[建筑科学—结构工程]