高强方钢管约束UHPC短柱轴压性能研究
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摘要
使用通用有限元软件ABAQUS分析了钢材屈服强度、方钢管厚度、UHPC强度对高强方钢管约束UHPC短柱轴压性能的影响。首先使用ABAQUS对已有的普通钢管约束混凝土试验进行计算,结果与试验值基本一致。在此基础上建立了高强方钢管约束UHPC短柱模型,对比了不同参数下构件荷载-位移曲线、荷载-纵向应变曲线的变化特征。研究表明:构件前期刚度受混凝土强度影响很小,但由于增加混凝土强度使构件套箍系数降低,工作曲线下降段斜率增大,延性下降。钢管屈服强度的提高对构件的延性有很大改善,但对极限承载能力影响较小。核心混凝土强度是影响高强钢管约束UHPC短柱承载能力的主要因素,由于钢管不直接承担纵向荷载,仅对混凝土产生材料性能上的影响,钢管约束混凝土应看做混凝土的一种。
The effects of steel yield strength, square steel tube thickness and UHPC strength on the axial compression performance of UHPC short column restrained by high strength square steel tube were analyzed by using general finite element software ABAQUS. Firstly, ABAQUS was used to conduct calculations for the existing confined concrete test of ordinary steel tubes, and the results were basically consistent with the test values. On this basis, the UHPC short column model of high-strength square steel tubes was established, and the change characteristics of load-displacement curve and load-longitudinal strain curve of components under different parameters were compared. The research shows that concrete strength has little influence on the initial stiffness of components, but the increase of concrete strength reduces the collar coefficient of components, increases the slope of the downward section of the work curve, and decreases the ductility. The increase of the yield strength of steel pipes can greatly improve the ductility of the components, but it has little influence on the ultimate bearing capacity. The strength of core concrete is the major factor that affects the bearing capacity of UHPC short column restrained by high-strength steel tubes. Since steel tubes do not bear longitudinal load directly, and it only affects the material performance of the concrete, steel tube restrained concrete should be regarded as a kind of concrete.
The effects of steel yield strength, square steel tube thickness and UHPC strength on the axial compression performance of UHPC short column restrained by high strength square steel tube were analyzed by using general finite element software ABAQUS. Firstly, ABAQUS was used to conduct calculations for the existing confined concrete test of ordinary steel tubes, and the results were basically consistent with the test values. On this basis, the UHPC short column model of high-strength square steel tubes was established, and the change characteristics of load-displacement curve and load-longitudinal strain curve of components under different parameters were compared. The research shows that concrete strength has little influence on the initial stiffness of components, but the increase of concrete strength reduces the collar coefficient of components, increases the slope of the downward section of the work curve, and decreases the ductility. The increase of the yield strength of steel pipes can greatly improve the ductility of the components, but it has little influence on the ultimate bearing capacity. The strength of core concrete is the major factor that affects the bearing capacity of UHPC short column restrained by high-strength steel tubes. Since steel tubes do not bear longitudinal load directly, and it only affects the material performance of the concrete, steel tube restrained concrete should be regarded as a kind of concrete.
引文
[1] 周绪红,刘界鹏,张素梅.圆钢管约束钢筋混凝土短柱的轴压力学性能[J].工程力学,2009 (11):53-59.
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[3] 陈宝春,韦建刚,苏家战,等.超高性能混凝土应用进展[J].建筑科学与工程学报,2019,36(2):10-20.
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[5] 陈盛.钢管约束UHPC轴压柱极限承载力研究[D].福州:福州大学.2016.
[6] HAGHINEJAD A,NEMATZADEH M.Three-dimensional finite element analysis of compressive behavior of circular steel tube-confined concrete stub columns by new confinement relationships[J],Latin American Journal of Solids & Structures,2016,13(5):916-944.
[7] XIONG D X.Structural behaviour of concrete filled steel tube with high strength materials[D].Doctoral Dissertation,National University of Singapore,Singapore,2012.
[8] RICHARD LIEW J Y,XIOING D X.Design guide for concrete filled tubular members with high strength materials-an extension of Eurocode 4 method to C90/105 concrete and S550 steel[S],Research Publishing,Blk 12 Lorong BakarBatu,349568 Singapore,2015.
[9] LIEW J,XIONG M,XIONG D.Design of concrete filled tubular beam-columns with high strength steel and concrete[J].Structures,2016,8(2):213-226.
[10] 周凯凯.方钢管超高性能混凝土短柱轴心受压性能研究[D].武汉:武汉大学,2018.
[11] 欧智菁,陈宝春.钢管混凝土柱极限承载力的统一算法研究[J].土木工程学报,2012,45(7):80-85.
[12] 韩林海.现代钢管混凝土结构技术[M].北京:中国建筑工业出版社,2009.
[13] 王杨.钢管约束活性粉末混凝土短柱轴压性能及承载力计算研究[D].西安:西安建筑科技大学,2018.
[2] HUANG F,YU X,CHEN B.The structural performance of axially loaded CFST columns under various loading conditions[J],Steel and Composite Structures 2012,13 (5):451-471.
[3] 陈宝春,韦建刚,苏家战,等.超高性能混凝土应用进展[J].建筑科学与工程学报,2019,36(2):10-20.
[4] YAN P,FENG J.Mechanical behavior of UHPC and UHPC filled steel tubular stub columns[C]//Proceeding of 2nd International Symposium on Ultra High Performance Concrete,Kassel,Germany,March,2008:355-362.
[5] 陈盛.钢管约束UHPC轴压柱极限承载力研究[D].福州:福州大学.2016.
[6] HAGHINEJAD A,NEMATZADEH M.Three-dimensional finite element analysis of compressive behavior of circular steel tube-confined concrete stub columns by new confinement relationships[J],Latin American Journal of Solids & Structures,2016,13(5):916-944.
[7] XIONG D X.Structural behaviour of concrete filled steel tube with high strength materials[D].Doctoral Dissertation,National University of Singapore,Singapore,2012.
[8] RICHARD LIEW J Y,XIOING D X.Design guide for concrete filled tubular members with high strength materials-an extension of Eurocode 4 method to C90/105 concrete and S550 steel[S],Research Publishing,Blk 12 Lorong BakarBatu,349568 Singapore,2015.
[9] LIEW J,XIONG M,XIONG D.Design of concrete filled tubular beam-columns with high strength steel and concrete[J].Structures,2016,8(2):213-226.
[10] 周凯凯.方钢管超高性能混凝土短柱轴心受压性能研究[D].武汉:武汉大学,2018.
[11] 欧智菁,陈宝春.钢管混凝土柱极限承载力的统一算法研究[J].土木工程学报,2012,45(7):80-85.
[12] 韩林海.现代钢管混凝土结构技术[M].北京:中国建筑工业出版社,2009.
[13] 王杨.钢管约束活性粉末混凝土短柱轴压性能及承载力计算研究[D].西安:西安建筑科技大学,2018.
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