方钢管再生混凝土短柱的轴压力学性能试验
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摘要
为研究钢管宽厚比及再生骨料取代率对方钢管再生混凝土短柱力学性能的影响,设计9根方钢管再生混凝土短柱进行了轴压试验,观察了试件在轴压力作用下的破坏过程,分析了钢管宽厚比和再生骨料取代率对试件荷载—位移和荷载—应变曲线的影响。结果表明,宽厚比及再生骨料取代率对钢管再生混凝土短柱的最终破坏形态影响不大,与普通钢管混凝土短柱相似,各试件均呈剪切破坏,最终破坏时,其纵向变形均超过30 mm;随着再生骨料取代率增大,荷载—位移曲线下降段越陡,但随着钢管宽厚比的增大,再生骨料取代率超过30%后,试件极限承载力越接近,说明考虑再生骨料取代率的不利影响更合理。最后结合试验提出了钢管再生混凝土短柱承载力计算方法,将计算结果与相关规程进行了对比,供工程应用参考。
In order to research the influence of the width / thickness ratio of steel tube and the replacement ratio of recycled aggregate in core concrete on the mechanical behavior of recycled aggregate concrete-filled square steel tube( RACFSST) short columns,9 specimens with different parameters were designed and tested under axial compression. The failure process of specimens was observed,and the impact of the width / thickness ratio of steel tube and the replacement ratio of recycled aggregate in core concrete on the loading-longitudinal displacement curves and loading-strain curves of specimens was analyzed. The results showed that the width / thickness ratio and the re-placement ratio of recycled aggregate have little effect on the failure patterns of RACFSST short columns,which were similar to the situation of the ordinary concrete-filled steel tube short columns,and the failure pattern of the specimens was shear failure. Its vertical deformation was more than30 mm eventually. As the replacement ratio of recycled aggregate decreased,the descent stage of load-displacement curves became steeper,but the bearing capacity of the RACFSST short columns was closer to one another with the increase of width / thickness ratio after the replacement ratio of recycled aggregate was over 30%,which indicated that taking the negative influence of replacement ratio of recycled aggregate into account would be more reasonable. Based on the tests,the bearing capacity calculation method of the RACFSST short column is proposed,which could provide practical project with useful reference.
In order to research the influence of the width / thickness ratio of steel tube and the replacement ratio of recycled aggregate in core concrete on the mechanical behavior of recycled aggregate concrete-filled square steel tube( RACFSST) short columns,9 specimens with different parameters were designed and tested under axial compression. The failure process of specimens was observed,and the impact of the width / thickness ratio of steel tube and the replacement ratio of recycled aggregate in core concrete on the loading-longitudinal displacement curves and loading-strain curves of specimens was analyzed. The results showed that the width / thickness ratio and the re-placement ratio of recycled aggregate have little effect on the failure patterns of RACFSST short columns,which were similar to the situation of the ordinary concrete-filled steel tube short columns,and the failure pattern of the specimens was shear failure. Its vertical deformation was more than30 mm eventually. As the replacement ratio of recycled aggregate decreased,the descent stage of load-displacement curves became steeper,but the bearing capacity of the RACFSST short columns was closer to one another with the increase of width / thickness ratio after the replacement ratio of recycled aggregate was over 30%,which indicated that taking the negative influence of replacement ratio of recycled aggregate into account would be more reasonable. Based on the tests,the bearing capacity calculation method of the RACFSST short column is proposed,which could provide practical project with useful reference.
引文
[1]陈梦成,刘京剑,黄宏.方钢管再生混凝土轴压短柱研究[J].广西大学学报(自然科学版),2014,39(4):693-700.
[2]杨有福.钢管再生混凝土构件力学性能和设计方法若干问题的探讨[J].工业建筑,2006,36(11):1-5.
[3]杨有福.钢管再生混凝土构件荷载—变形关系的理论分析[J].工业建筑,2007,37(12):7-12.
[4]KONNO K,SATO Y,UEDA T,et al.Mechanical property of recycled concrete under lateral confinement[J].Transactions of the Japan Concrete Institute,1998,20(3):287-292.
[5]KHATIB J M.Property of concrete incorporation fine recycled aggregate[J].Cement and Concrete Research,2005,35(4):763-769.
[6]LIU Yixiang,ZHA Xiaoxiong,GONG Guobin.Study on recycled-concrete-filled steel tube and recycled concrete based on damage mechanics[J].Journal of Constructional Steel Research,2012,71(1):143-148.
[7]周静海,苏明,孟宪宏,等.再生自密实钢管混凝土轴压短柱试验[J].沈阳建筑大学学报(自然科学版),2011,27(2):266-271.
[8]陈宗平,徐金俊,薛建阳.取代率对钢管再生混凝土轴压短柱性能退化的影响分析[J].试验力学,2014,29(2):207-214.
[9]何东,王清远,邱慈长,等.钢管再生混凝土轴心受压的荷载—变形理论研究和试验分析[J].四川大学学报(工程科学版),2010,42(S1):49-53.
[10]陈梦成,刘京剑,黄宏.圆钢管再生混凝土轴压短柱研究[J].混凝土,2014(12):43-48.
[11]韩林海,杨有福.现代钢管混凝土结构技术[M].北京:中国建筑工业出版社,2004.
[12]British Standards Institutions.Steel,concrete and composite bridges,Part 5:Code of practice for design of bridges:BS5400-1979[S].London:British Standards Institutions,1979.
[13]福建省建筑业协会混凝土分会.钢管混凝土结构技术规程:DBJ 13-51-2003[S].福州:福建省住房和城乡建设厅,2003.
[14]中国人民解放军总后勤部.战时军港抢修早强型组合结构技术规程:GJB 4142-2000[S].北京:中国标准出版社,2000.
[15]柯晓君,陈宗平,薛建阳,等.方钢管再生混凝土短柱轴压承载性能试验研究[J].工程力学,2013,30(8):35-41.
[16]李军涛,陈宗平,刘峰.钢管再生混凝土轴压性能试验研究[J].混凝土,2013(7):13-15,18.
[2]杨有福.钢管再生混凝土构件力学性能和设计方法若干问题的探讨[J].工业建筑,2006,36(11):1-5.
[3]杨有福.钢管再生混凝土构件荷载—变形关系的理论分析[J].工业建筑,2007,37(12):7-12.
[4]KONNO K,SATO Y,UEDA T,et al.Mechanical property of recycled concrete under lateral confinement[J].Transactions of the Japan Concrete Institute,1998,20(3):287-292.
[5]KHATIB J M.Property of concrete incorporation fine recycled aggregate[J].Cement and Concrete Research,2005,35(4):763-769.
[6]LIU Yixiang,ZHA Xiaoxiong,GONG Guobin.Study on recycled-concrete-filled steel tube and recycled concrete based on damage mechanics[J].Journal of Constructional Steel Research,2012,71(1):143-148.
[7]周静海,苏明,孟宪宏,等.再生自密实钢管混凝土轴压短柱试验[J].沈阳建筑大学学报(自然科学版),2011,27(2):266-271.
[8]陈宗平,徐金俊,薛建阳.取代率对钢管再生混凝土轴压短柱性能退化的影响分析[J].试验力学,2014,29(2):207-214.
[9]何东,王清远,邱慈长,等.钢管再生混凝土轴心受压的荷载—变形理论研究和试验分析[J].四川大学学报(工程科学版),2010,42(S1):49-53.
[10]陈梦成,刘京剑,黄宏.圆钢管再生混凝土轴压短柱研究[J].混凝土,2014(12):43-48.
[11]韩林海,杨有福.现代钢管混凝土结构技术[M].北京:中国建筑工业出版社,2004.
[12]British Standards Institutions.Steel,concrete and composite bridges,Part 5:Code of practice for design of bridges:BS5400-1979[S].London:British Standards Institutions,1979.
[13]福建省建筑业协会混凝土分会.钢管混凝土结构技术规程:DBJ 13-51-2003[S].福州:福建省住房和城乡建设厅,2003.
[14]中国人民解放军总后勤部.战时军港抢修早强型组合结构技术规程:GJB 4142-2000[S].北京:中国标准出版社,2000.
[15]柯晓君,陈宗平,薛建阳,等.方钢管再生混凝土短柱轴压承载性能试验研究[J].工程力学,2013,30(8):35-41.
[16]李军涛,陈宗平,刘峰.钢管再生混凝土轴压性能试验研究[J].混凝土,2013(7):13-15,18.