冻融循环后圆钢管混凝土短柱轴压性能试验研究
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摘要
对冻融循环作用后圆钢管混凝土短柱的受力性能进行试验研究,以钢管壁厚、冻融循环作用次数以及混凝土强度等级为设计参数。试验中分析了冻融循环作用后圆钢管混凝土短柱的轴压破坏现象、荷载-位移曲线以及应力-应变曲线等。试验结果表明:经冻融循环作用后的圆钢管混凝土短柱的轴压破坏形态与相应未经冻融循环作用短柱类似;减小圆钢管混凝土短柱的径厚比可提高其在冻融环境下的轴压承载力;提高混凝土强度等级能增加圆钢管混凝土短柱的初始刚度;冻融循环对圆钢管混凝土短柱的轴压承载力影响较小;预测圆钢管混凝土可适用于遭受冻融作用的地区。根据试验结果,提出了圆钢管混凝土经冻融循环后的轴压承载力计算公式,计算结果与试验结果吻合较好。
Experimental study on mechanical properties of circular CFST stub columns after freeze-thaw cycles,the parameters of the test were the thickness of circular steel tubular,the number of freeze-thaw cycles and the strength of concrete. The axial compression failure phenomenon,load-displacement curve and stress-strain curve of the circular CFST stub column after freeze-thaw cycles were analyzed. The experimental results show that the failure mode of the circular CFST short column under axial compression after freeze-thaw cycles is similar to that without freeze-thaw cycle; the axial bearing capacity of circular CFST stub columns after freeze-thaw cycles is improved with the decreasing ratio of radial diameter to thickness of specimens; the initial stiffness of the circular CFST stub columns increases with the increasing concrete strength grade; the freeze-thaw cycles have a little effects on the axial bearing capacity of circular CFST stub columns; the circular CFST short columns have better application in freezing and thawing environment. According to the test results,the formula for caculating the axial bearing capacity of circular CFST stub column after freeze-thaw cycles was proposed,which was in good agreement with the experimental results.
Experimental study on mechanical properties of circular CFST stub columns after freeze-thaw cycles,the parameters of the test were the thickness of circular steel tubular,the number of freeze-thaw cycles and the strength of concrete. The axial compression failure phenomenon,load-displacement curve and stress-strain curve of the circular CFST stub column after freeze-thaw cycles were analyzed. The experimental results show that the failure mode of the circular CFST short column under axial compression after freeze-thaw cycles is similar to that without freeze-thaw cycle; the axial bearing capacity of circular CFST stub columns after freeze-thaw cycles is improved with the decreasing ratio of radial diameter to thickness of specimens; the initial stiffness of the circular CFST stub columns increases with the increasing concrete strength grade; the freeze-thaw cycles have a little effects on the axial bearing capacity of circular CFST stub columns; the circular CFST short columns have better application in freezing and thawing environment. According to the test results,the formula for caculating the axial bearing capacity of circular CFST stub column after freeze-thaw cycles was proposed,which was in good agreement with the experimental results.
引文
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[12]龙跃凌,蔡健.核心高强钢管混凝土组合柱轴压承载力计算新方法[J].华南理工大学学报(自然科学版),2010,38(11):26-31.(LONG Yueling,CAIJian.A new method to calculate axial bearing capacity of composite columns with core of high-strength concrete-filled steel tube[J].Journal of South China University of Technology(Natural Science Edition),2010,38(11):26-31.(in Chinese))
[13]混凝土抗冻试验设备:JG/T 243-2009[S].北京:中国标准出版社,2009.(Apparatu for resistance to freeze-thaw test of concrete:JG/T 243-2009[S].Beijing:Standards Press of China,2009.(in Chinese))
[14]普通混凝土长期性能和耐久性能试验方法标准:GB/T 50082-2009[S].北京:中国建筑工业出版社,2009.(Standard for test methods of long-term performance and durability of ordinary concrete:GB/T50082-2009[S].Beijing:China Architecture&Building Press,2009.(in Chinese))
[15]CHEN Y,FENG R,WANG J.Behaviour of bird-beak square hollow section X-joints under out-of-plane bending[J].Journal of Constructional Steel Research,2015,106(11):234-245.
[2]丁发兴,余志武.钢管混凝土短柱力学性能研究-理论分析[J].工程力学,2005,22(1):175-181.(DINGFaxing,YU Zhiwu.Theoretical analysis of mechanical properties of concrete-filled tubular steel stub columns[J].Engineering Mechanics,2005,22(1):175-181.(in Chinese))
[3]刘威,韩林海.钢管混凝土受轴向局压荷载时的工作机理研究[J].土木工程学报,2006,39(6):19-27.(LIU Wei,HAN Linhai.Behaviors of concrete-filled steel tubes subject axial local compression[J].China Civil Engineering Journal,2006,39(6):19-27.(in Chinese))
[4]韩林海.钢管混凝土结构:理论与实践[M].北京:科学出版社,2016:222-227.(HAN Linhai.Concretefilled steel tubular structures:theory and practice[M].Beijing:Science Press,2016:222-227.(in Chinese))
[5]王庆利,李清林,屈绍娥.长期荷载下圆钢管混凝土梁的耐腐蚀性能试验研究[J].建筑结构学报,2015,36(增刊2):50-55.(WANG Qingli,LI Qinglin,QUShaoe.Experimental study on corrosion resistance property of circular concrete filled steel tubular beam under long-term loading[J].Journal of Building Structures,2015,36(Suppl.2):50-55.(in Chinese))
[6]许开成,陈梦成,何小平.氯离子腐蚀对钢管混凝土界面黏结性能影响的试验分析[J].工业建筑,2013,43(1):71-74.(XU Kaicheng,CHENMengcheng,HE Xiaoping.Experimental analysis of CFST interface bonding property by corrosion of chlorine ion[J].Industrial Construction,2013,43(1):71-74.(in Chinese))
[7]邹超英,赵娟,梁锋,等.冻融作用后混凝土力学性能的衰减规律[J].建筑结构学报,2008,29(1):117-123.(ZOU Chaoying,ZHAO Juan,LIANG Feng,et al.Degradation of mechanical properties of concrete caused by freeze-thaw action[J].Journal of Building Structures,2008,29(1):117-123.(in Chinese))
[8]曹大富,富立志,杨忠伟,等.冻融循环作用下混凝土受压本构特征研究[J].建筑材料学报,2013,16(1):17-23.(CAO Dafu,FU Lizhi,YANG Zhongwei,et al.Study on constitutive relations of compressed concrete subjected to action of freezing-thawing cycles[J].Journal of Building Materials,2013,16(1):17-23.(in Chinese))
[9]田威,韩女,张鹏坤.混凝土冻融循环下动态破损机理的试验研究[J].振动与冲击,2017,36(8):79-85.(TIAN Wei,HAN Nü,ZHANG Pengkun.Experimental study on the dynamic damage mechanism of concrete under freeze-thaw cycles[J].Journal of Vibration and Shock,2017,36(8):79-85.(in Chinese))
[10]祝金鹏,李术才,刘宪波,等.冻融环境下混凝土力学性能退化模型[J].建筑科学与工程学报,2009,26(1):62-67.(ZHU Jinpeng,LI Shucai,LIU Xianbo,et al.Mechanical property deterioration model for concrete in environment with freezing-thawing[J].Journal of Architecture and Civil Engineering,2009,26(1):62-67.(in Chinese))
[11]杨有福,曹凯,杨志泉,等.冻融循环作用后钢管混凝土轴压短柱力学性能[J].中国公路学报,2014,27(3):51-58.(YANG Youfu,CAO Kai,YANGZhiquan,et al.Mechanical properties of concrete-filled steel tubular stubs after freezing and thawing cycles under axial loading[J].China Journal of Highway and Transport,2014,27(3):51-58.(in Chinese))
[12]龙跃凌,蔡健.核心高强钢管混凝土组合柱轴压承载力计算新方法[J].华南理工大学学报(自然科学版),2010,38(11):26-31.(LONG Yueling,CAIJian.A new method to calculate axial bearing capacity of composite columns with core of high-strength concrete-filled steel tube[J].Journal of South China University of Technology(Natural Science Edition),2010,38(11):26-31.(in Chinese))
[13]混凝土抗冻试验设备:JG/T 243-2009[S].北京:中国标准出版社,2009.(Apparatu for resistance to freeze-thaw test of concrete:JG/T 243-2009[S].Beijing:Standards Press of China,2009.(in Chinese))
[14]普通混凝土长期性能和耐久性能试验方法标准:GB/T 50082-2009[S].北京:中国建筑工业出版社,2009.(Standard for test methods of long-term performance and durability of ordinary concrete:GB/T50082-2009[S].Beijing:China Architecture&Building Press,2009.(in Chinese))
[15]CHEN Y,FENG R,WANG J.Behaviour of bird-beak square hollow section X-joints under out-of-plane bending[J].Journal of Constructional Steel Research,2015,106(11):234-245.