Effect of preload on the axial capacity of CFST reinforced concrete columns
Wu XU1,Qing YU1(),Guohuang YAO1,2
1. Department of Civil Engineering, Tsinghua University, Beijing100084, China
2. Shenzhen Municipal Design & ResearchInstitute Co. Ltd, Shenzhen 518029, China
The effect of the preload on the axial capacity of a CFST encased concrete column was modeled using a finite element model. The influence of the preload on the axial strength of the column was analyzed for various factors such as the section size, steel strength and concrete strength. The results show that the load versus deformation curve for the column with a preload move back with a slight increase in the axial strength. The preload ratio and the ratio of the outer concrete strength to the inner concrete strength significant affect the axial strength. Formulas are given to calculate the axial strength with a preload that considers the influence of these parameters as well as the confinement effect.
韩林海, 陶忠, 王文达. 现代组合结构和混合结构——试验、理论和方法 [M]. 北京: 科学出版社, 2007. HAN Linhai, TAO Zhong, WANG Wenda. Advanced Composite and Mixed Structures——Testing, Theory and Design Approach [M]. Beijing: China Science Press, 2007. (in Chinese)
[2]
林拥军, 程文襄, 徐明. 配有圆钢管的钢骨混凝土柱轴压比限值的试验研究[J]. 土木工程学报, 2001, 34(6): 23-28. LIN Yongjun, CHEN Wenxiang, XU Ming. Experimental study on limit values of Axial compression ratio of SRC columns with circular steel tube[J]. China Civil Engineering Journal, 2011, 34(6): 23-28. (in Chinese)
[3]
康洪震, 钱稼茹. 钢管混凝土叠合柱轴压强度试验研究[J]. 建筑结构, 2006, 36(增刊): 22-25. KANG Hongzhen, QIAN Jiaru. An experiment study of axial compressive strength of concrete filled steel tube composite columns[J]. Building Structure, 2006, 36(s): 22-25. (in Chinese)
[4]
陈周熠. 钢管高强混凝土核心柱设计计算方法研究 [D]. 大连: 大连理工大学, 2002. CHEN Zhouyi. Study of the Method for Design and Calculation of HSC Columns Reinforced with Concrete Filled Steel Tube [D]. Dalian: Dalian University of Technology, 2002. (in Chinese)
[5]
钱稼茹, 康洪震. 钢管高强混凝土组合柱抗震性能试验研究[J]. 建筑结构学报, 2009, 30(4): 11-20. QIAN Jiaru, KANG Hongzhen. Experimental study on seismic behavior of high-strength concrete-filled steel tube composite columns[J]. Journal of Building Structures, 2009, 30(4): 11-20. (in Chinese)
[6]
廖飞宇, 韩林海. 方形钢管混凝土叠合柱的力学性能研究[J]. 工程力学, 2010, 27(4): 153-162. LIAO Feiyu, HAN Linhai. Performance of concrete-filled steel tube reinforced concrete columns with square sections[J]. Engineering Mechanics, 2010, 27(4): 153-162. (in Chinese)
[7]
黄世娟, 钟善桐, 闫善章, 等. 初应力对钢管混凝土轴压构件承载力影响的试验研究[J]. 哈尔滨建筑大学学报, 1996, 29(6): 44-50. HUANG Shijuan, ZHONG Shantong, YAN Shanzhang, et al.Experimental research of prestress effect on bearing capacity of concrete filled steel tubular axial compressive members[J]. Journal of Harbin University of Civil Engineering and Architecture, 1996, 29(6): 44-50. (in Chinese)
[8]
尧国皇. 钢管初应力对钢管混凝土压弯构件力学性能的影响研究 [D]. 福州: 福州大学, 2002. YAO Guohuang. Effect of Pre-Load on the Steel Tubes of CFST Columns Subjected to Compression and Bending [D]. Fuzhou: Fuzhou University, 2002. (in Chinese)
[9]
XIONG Dexin, ZHA Xiaoxiong. A numerical investigation on the behavior of concrete-filled steel tubular columns under initial stresses[J]. Journal of Constructional Steel Research, 2007, 63(5): 599-611.
[10]
HAN Linhai, YAO Guohuang. Behaviour of concrete-filled hollow structural steel (HSS) columns with pre-load on the steel tubes[J]. Journal of Constructional Steel Research, 2003, 59(12): 1455-1475.
[11]
Liew J Y R, XIONG Dexin. Effect of preload on the axial capacity of concrete-filled composite columns[J]. Journal of Constructional Steel Research, 2009, 65(3): 709-722.
[12]
CECS 188: 2005. 钢管混凝土叠合柱结构技术规程 [S]. 北京: 中国计划出版社, 2005. CECS 188: 2005. Technical Specification for Steel Tube-Reinforced Concrete Column Structure [S]. Beijing: China Planning Press, 2005. (in Chinese)
[13]
韩林海. 钢管混凝土结构——理论与实践 [M]. 第二版. 北京: 科学出版社, 2007. HAN Linhai. Concrete Filled Steel Tubular Structures——Theory and Practice [M]. 2nd Ed. Beijing: China Science Press, 2007. (in Chinese)
[14]
Attard M M, Setunge S. Stress-strain relationship of confined and unconfined concrete[J]. ACI Materials Journal, 1996, 93(5): 432-442.
2014, Vol. 54 
),尧国皇1,2
