圆钢管钢纤维活性粉末混凝土短柱轴压性能试验研究
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摘要
为研究圆钢管钢纤维活性粉末混凝土(RPC)短柱的轴压性能,完成了7根外径219～273 mm的圆钢管钢纤维RPC短柱轴压性能试验,分析了套箍系数、径厚比对轴压试件荷载-应变曲线和破坏特征的影响。结果表明:套箍系数ξ在0.63～0.88时,荷载-位移曲线在峰值荷载后出现下降段,短柱呈现剪切破坏模式;当ξ≥1时,在到达峰值荷载后,荷载下降幅度明显减小或出现回升趋势,短柱呈现腰鼓形破坏模式。在达到峰值荷载的85%之前,试件处于弹性阶段,钢管纵向应变大于横向应变;弹塑性阶段,钢管横向应变增加较快,其横向变形系数超过钢管的泊松比并逐渐增大,钢管对RPC的约束作用不断增强。随着混凝土抗压强度提高,其横向变形系数减小,钢管对核心区RPC约束效果降低。
In order to investigate the axial compression behavior of reactive powder concrete(RPC) filled circular steel tube columns, seven tests on the column specimens that diameter ranged from 219 to 273 mm under axial compression were conducted.The effect of the confinement factor and diameter-thickness ratio on load-strain curves and failure patterns were studied. The experimental results show that the specimens have an obvious descending branch after the peak load and shear failure occurs when the confinement factor ξ ranges from 0.63 to 0.88. The specimens with a confinement factor ξ≥1 exhibit local buckling failure. Moreover, the axial bearing capacity decreases slightly and then gradually regains after the peak load. Before 85% of ultimate load, the longitudinal strain develops faster than the transverse strain in the elastic stage. In the inelastic stage, the transverse strain increases significantly. The transverse stress of steel increases rapidly and the confining force increases because the transverse deformation coefficient of the core RPC exceeds the Poisson's ratio of the steel tube. With an increase in the concrete compressive strength, the lateral deformation coefficient is decreased, which reduces the confinement effect to the core concrete.
In order to investigate the axial compression behavior of reactive powder concrete(RPC) filled circular steel tube columns, seven tests on the column specimens that diameter ranged from 219 to 273 mm under axial compression were conducted.The effect of the confinement factor and diameter-thickness ratio on load-strain curves and failure patterns were studied. The experimental results show that the specimens have an obvious descending branch after the peak load and shear failure occurs when the confinement factor ξ ranges from 0.63 to 0.88. The specimens with a confinement factor ξ≥1 exhibit local buckling failure. Moreover, the axial bearing capacity decreases slightly and then gradually regains after the peak load. Before 85% of ultimate load, the longitudinal strain develops faster than the transverse strain in the elastic stage. In the inelastic stage, the transverse strain increases significantly. The transverse stress of steel increases rapidly and the confining force increases because the transverse deformation coefficient of the core RPC exceeds the Poisson's ratio of the steel tube. With an increase in the concrete compressive strength, the lateral deformation coefficient is decreased, which reduces the confinement effect to the core concrete.
引文
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[15] 吴波,刘伟,刘琼祥,许喆.钢管再生混合短柱的轴压性能试验[J].土木工程学报,2010,43(2):32-38.(WU Bo, LIU Wei, LIU Qiongxiang, XU Zhe. Experimental study on the behavior of recycled-concrete-segment lump filled steel tubular stub columns subjected to concentrically axial load[J].China Civil Engineering Journal, 2010,43(2):32-38.(in Chinese))
[16] 菅伟.圆钢管活性粉末混凝土短柱轴压性能试验与设计方法[D]. 哈尔滨:哈尔滨工业大学,2016:90-92.(JIAN Wei. Experimental research and design method on behavior of reactive powder concrete-filled circular steel tube columns under axial compression[D]. Harbin: Harbin Institute of Technology,2016:90-92.(in Chinese))
[17] 田宇. 圆钢管混凝土短柱轴压性能尺寸效应试验研究[D]. 哈尔滨:哈尔滨工业大学,2014:37- 40.(TIAN Yu. Experimental research on size effect of concrete-filled steel tubular stub columns under axial compressive Load[D]. Harbin: Harbin Institute of Technology,2014:37- 40. (in Chinese))
[18] ?TEMBERK Petr, KOHOUTKOVá Alena. Image-analysis-based measuring of lateral deformation of hardening concrete[J]. Material Science, 2005,11(3):292-296.
[19] 滕跃.圆钢管约束高强混凝土的本构关系研究[D]. 重庆:重庆大学,2016:33-37.(TENG Yue. Research on constitutive relation of circular tube confined high strength concrete[D]. Chongqing: Chongqing University, 2016:33-37. (in Chinese))
[20] 柯开展,周瑞忠.掺短切碳纤维活性粉末混凝土的受压力学性能研究[J].福州大学学报(自然科学版),2006,34(5):739-744.(KE Kaizhan, ZHOU Ruizhong. Compressive mechanics of carbon fiber RPC[J]. Journal of Fuzhou University (Natural Science), 2006, 34(5):739-744. (in Chinese))
[2] BLAIS P Y, COUTURE M. Prestressed pedestrian bridge-world’s first reactive powder concrete structure[J]. PCI,1999, 44: 60-71.
[3] 罗华,季文玉,闫志刚,李旺旺.加载方式对钢管活性粉末混凝土短柱抗压性能影响的研究[J].铁道学报,2015,36(9):105-110.(LUO Hua, JI Wenyu, YAN Zhigang, LI Wangwang. Research on influence of loading methods on compressive behavior of reactive powder concrete filled steel tube stub columns under axial loads[J]. Journal of the China Railway Society,2015,36(9):105-110.(in Chinese))
[4] 林震宇,吴炎海,沈祖炎.圆钢管活性粉末混凝土轴压力学性能研究[J].建筑结构学报,2005,26(4):52-57.(LIN Zhenyu, WU Yanhai, SHEN Zuyan. Research on behavior of RPC filled circular steel tube column subjected to axial compression[J]. Journal of Building Structures,2005, 26(4):52-57.(in Chinese))
[5] 田志敏,张想柏,冯文才,阎培渝.钢管超高性能RPC短柱的轴压特性研究[J].地震工程与工程振动,2008,28(1):99-107.(TIAN Zhimin, ZHANG Xiangbo, FENG Wencai, YAN Peiyu. Characteristics of RPC-filled steel tubular puncheons with ultrahigh performance subjected to axial compressive loading[J].Journal of Earthquake Engineering and Engineering Dynamics, 2008,28(1):99-107.(in Chinese))
[6] 卢亦焱,陈娟,李彬.钢管钢纤维高强混凝土短柱轴心受压试验研究[J].建筑结构学报,2011,32(10):166-172.(LU Yiyan, CHEN Juan, LI Bin. Experimental research on steel fiber reinforced high strength concrete filled steel tubular short columns subjected to axial compression load[J]. Journal of Building Structures, 2011,32(10):166-172.(in Chinese))
[7] 陈国灿,徐志胜,杨智硕,田智友.钢管超高强石渣混凝土轴压短柱静力性能试验研究[J].建筑结构学报,2011,32(3):82-89.(CHEN Guocan, XU Zhisheng, YANG Zhishuo, TIAN Zhiyou. Experimental study on behavior of short steel tubular columns filled with ultra-high strength concrete mixed with stone-chip subjected to axial load[J]. Journal of Building Structures, 2011,32(3):82-89.(in Chinese))
[8] HUANG Wenjin, ZHANG Zhengbin, HUANG Qinwei, et al. Experimental study on mechanical properties of RPC-FST under direct tension load[C]// Proceedings of 1st international Conference on UHPC Materials and Structures. Bagneux, France: RILEM Publications S.A.R.L., 2016:236-246.
[9] 应铮.钢管活性粉末混凝土直接轴拉性能试验研究[D].福州:福建农林大学,2016:24-30. (YING Zheng. Experimental study on mechanical properties of RPC-FST under direct tension load[D]. Fuzhou: Fujian Agriculture and Forestry University, 2016:24-30. (in Chinese))
[10] 李靖.考虑壁厚影响的钢管-RPC轴拉性能试验研究[D].福州:福建农林大学,2017:17-23. (LI Jing. Experimental study on axial tensile behavior of RPC-FST influenced by wall thickness[D]. Fuzhou: Fujian Agriculture and Forestry University, 2017:17-23. (in Chinese))
[11] 黄文金,盛叶,张正宾,姚鹏宇,陈辉.钢管-钢纤维活性粉末混凝土界面黏结强度试验研究[J].建筑结构学报,2017,38(增刊1):502-507. (HUANG Wenjin, SHENG Ye, ZHANG Zhengbin, YAO Pengyu, CHEN Hui. Experimental study on bond strength of interface between steel fiber reinforced reactive powder concrete and steel tube[J]. Journal of Building Structures, 2017, 38(Suppl.1):502-507.(in Chinese))
[12] 吕雪源,王英,符程俊,郑文忠.活性粉末混凝土基本力学性能指标取值[J].哈尔滨工业大学学报,2014,46(10):1-9.(Lü Xueyuan, WANG Ying, FU Chengjun, ZHENG Wenzhong. Basic mechanical property indexes of reactive powder concrete[J]. Journal of Harbin Institute of Technology, 2014,46(10):1-9.(in Chinese))
[13] VERMEER P A, DE BORST R. Non associated plasticity for soils[J]. Concrete and Rock,1984,29(3):3- 64.
[14] 王玉银,张素梅.圆钢管高强混凝土轴压短柱受剪承载力分析[J].建筑结构学报,2009,30(2):114-124.(WANG Yuyin, ZHANG Sumei. Shear resistant behavior of axially loaded high-strength concrete-filled steel tubular stub columns[J]. Journal of Building Structures, 2009,30(2):114-124.(in Chinese))
[15] 吴波,刘伟,刘琼祥,许喆.钢管再生混合短柱的轴压性能试验[J].土木工程学报,2010,43(2):32-38.(WU Bo, LIU Wei, LIU Qiongxiang, XU Zhe. Experimental study on the behavior of recycled-concrete-segment lump filled steel tubular stub columns subjected to concentrically axial load[J].China Civil Engineering Journal, 2010,43(2):32-38.(in Chinese))
[16] 菅伟.圆钢管活性粉末混凝土短柱轴压性能试验与设计方法[D]. 哈尔滨:哈尔滨工业大学,2016:90-92.(JIAN Wei. Experimental research and design method on behavior of reactive powder concrete-filled circular steel tube columns under axial compression[D]. Harbin: Harbin Institute of Technology,2016:90-92.(in Chinese))
[17] 田宇. 圆钢管混凝土短柱轴压性能尺寸效应试验研究[D]. 哈尔滨:哈尔滨工业大学,2014:37- 40.(TIAN Yu. Experimental research on size effect of concrete-filled steel tubular stub columns under axial compressive Load[D]. Harbin: Harbin Institute of Technology,2014:37- 40. (in Chinese))
[18] ?TEMBERK Petr, KOHOUTKOVá Alena. Image-analysis-based measuring of lateral deformation of hardening concrete[J]. Material Science, 2005,11(3):292-296.
[19] 滕跃.圆钢管约束高强混凝土的本构关系研究[D]. 重庆:重庆大学,2016:33-37.(TENG Yue. Research on constitutive relation of circular tube confined high strength concrete[D]. Chongqing: Chongqing University, 2016:33-37. (in Chinese))
[20] 柯开展,周瑞忠.掺短切碳纤维活性粉末混凝土的受压力学性能研究[J].福州大学学报(自然科学版),2006,34(5):739-744.(KE Kaizhan, ZHOU Ruizhong. Compressive mechanics of carbon fiber RPC[J]. Journal of Fuzhou University (Natural Science), 2006, 34(5):739-744. (in Chinese))