约束混凝土拱架套管节点压弯承载特性研究
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摘要
为解决约束混凝土现场应用过程中套管节点设计保守、施工困难等难题,采用室内试验与数值试验相结合的方式,综合考虑不同套管节点构造参数及不同偏心率加载,分析套管节点试件压弯组合力学性能及破坏形态,开展套管节点参数影响规律研究。结果表明:1)节点试件压弯组合作用下呈现典型两阶段工作模式及变形破坏模式;2)节点与拱架接触部位发生明显的应力集中现象,试件呈折线形破坏;3)荷载-位移曲线表现为典型的弹性、弹塑性和塑性3阶段特性,轴压承载力与无套管试件相比降低19.4%左右;4)得到了不同套管节点参数的M-N曲线,提出了节点经济性指标β1,β2,量化了套管节点强度与经济成本之间的关系,提出了工程设计建议,为相关工程设计应用提供借鉴。
In order to solve the problems of conservative design and construction difficulties during applying the casing joint in confined concrete arch, the mechanical properties and failure modes of casing joints, as well as the effects of joints parameters on them are studied. In this study, the indoor test and numerical simulation are both adopted, with considering the different structural parameters and loading eccentricity. Results show that: 1) Under the combined state of bending and compression, the joints experience two typical stages of working conditions and two deformation and failure modes. 2) Stress concentration phenomenon occurs at the contact area between the casing and arch member, and the specimen exhibits folded-line failure mode. 3) The load-displacement curve shows three typical stages which are elastic stage, elastic-plastic stage and plastic stage, respectively. The axial compression bearing capacity of casing joint specimen reduces by 19.4% compared with the jointless specimen. 4) The M-N curves of casing joint specimen with different parameters are obtained. Meanwhile, the economic indexes β1 and β2 of joints are proposed to quantify the relationship between joint strength and economic cost. Engineering design suggestions are also proposed which can be used to guide related engineering design and application.
In order to solve the problems of conservative design and construction difficulties during applying the casing joint in confined concrete arch, the mechanical properties and failure modes of casing joints, as well as the effects of joints parameters on them are studied. In this study, the indoor test and numerical simulation are both adopted, with considering the different structural parameters and loading eccentricity. Results show that: 1) Under the combined state of bending and compression, the joints experience two typical stages of working conditions and two deformation and failure modes. 2) Stress concentration phenomenon occurs at the contact area between the casing and arch member, and the specimen exhibits folded-line failure mode. 3) The load-displacement curve shows three typical stages which are elastic stage, elastic-plastic stage and plastic stage, respectively. The axial compression bearing capacity of casing joint specimen reduces by 19.4% compared with the jointless specimen. 4) The M-N curves of casing joint specimen with different parameters are obtained. Meanwhile, the economic indexes β1 and β2 of joints are proposed to quantify the relationship between joint strength and economic cost. Engineering design suggestions are also proposed which can be used to guide related engineering design and application.
引文
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[17]王琦,李术才,王汉鹏,等.可缩式钢管混凝土支架力学性能及经济效益[J].山东大学学报(工学版),2011,41(5):103-107.WANG Qi,LI Shucai,WANG Hanpeng,et al.Mechanical property and economic effect of contractible concrete filled steel tube support[J].Journal of Shandong University(Engineering Science),2011,41(5):103-107.
[18]李为腾,王琦,李术才,等.方钢约束混凝土拱架套管节点抗弯性能试验研究[J].中国矿业大学学报,2015,44(6):1072-1083.LI Weiteng,WANG Qi,LI Shucai,et al.Test study on bending properties of casing joint of square confined concrete arch support[J].Journal of China University of Mining&Technology,2015,44(6):1072-1083.
[2]方新秋,赵俊杰,洪木银.深井破碎围岩巷道变形机理及控制研究[J].采矿与安全工程学报,2012,29(1):1-7.FANG Xinqiu,ZHAO Junjie,HONG Muyin.Failure mechanism and control measure of roadway deformation with fractured surrounding rock in deep mine[J].Journal of Mining&Safety Engineering,2012,29(1):1-7.
[3]WANG Qi,RAN Rui,JIANG Bei,et al.Study on failure mechanism of roadway with soft rock in deep coal mine and confined concrete support system[J].Engineering Failure Analysis,2017,81:155-177.
[4]王其洲,谢文兵,荆升国,等.构造复杂区硐室群围岩失稳机理及控制技术研究[J].采矿与安全工程学报,2014,31(2):263-269.WANG Qizhou,XIE Wenbing,JING Shengguo,et al.Instability mechanism and control technology of chamber group surrounding rock in complex structural area[J].Journal of Mining&Safety Engineering,2014,31(2):263-269.
[5]AGHDAMY S,THAMBIRATNAM D P,DHANAS-EKER M,et al.Effects of structure-related parameters on the response of concrete-filled double-skin steel tube columns to lateral impact[J].Thin-walled Structures,2016,108:351-368.
[6]ELLOBODY E,YOUNG B,LAM D,et al.Behaviour of normal and high strength concrete-filled compact steel tube circular stub columns[J].Journal of Constructional Steel Research,2006,62(8):706-715.
[7]HASSAN M M,MAHMOUD A A,SERROR M H,et al.Behavior of concrete-filled double skin steel tube beam-columns[J].Steel and Composite Structures,2016,22(5):1141-1162.
[8]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,2007:5-10.
[9]WANG Q,JIANG B,LI Y,et al.Mechanical properties of square-steel confined-concrete quantitative pressure-relief arch and its application in a deep mine[J].International Journal of Mining,Reclamation and Environment,2017,31(1):1-23.
[10]臧德胜,韦潞.钢管混凝土支架的研究和实验室试验[J].建井技术,2001,22(6):25-28.ZANG Desheng,WEI Lu.Research and laboratory experiment of concrete filled steel tube support[J].Mine Construction Technology,2001,22(6):25-28.
[11]谷拴成,刘皓东.钢管混凝土拱架在地铁隧道中的应用研究[J].铁道建筑,2009(12):56-60.GU Shuancheng,LIU Haodong.Applied research on concrete filled steel tube support of subway tunnel[J].Railway Engineering,2009(12):56-60.
[12]高延法,王波,王军,等.深井软岩巷道钢管混凝土支护结构性能试验及应用[J].岩石力学与工程学报,2010,29(增刊1):2604-2609.GAO Yanfa,WANG Bo,WANG Jun,et al.Test on structural property and application of concrete-filled steel tube support of deep mine and soft rock roadway[J].Chinese Journal of Rock Mechanics and Engineering,2010,29(Sup 1):2604-2609.
[13]王波.软岩巷道变形机理分析与钢管混凝土支架支护技术研究[D].北京:中国矿业大学(北京),2009.
[14]江贝.超大断面隧道软弱围岩约束混凝土控制机理及应用研究[D].济南:山东大学,2016.
[15]王庆利,谭鹏宇,魏溯华,等.圆CFRP-钢管混凝土压弯构件静力性能试验研究[J].建筑结构学报,2008,29(5):67-74.WANG Qingli,TAN Pengyu,WEI Suhua,et al.Experimental study on static performance of the eccentrically compressed concrete filled circular CFRP steel tubular member[J].Journal of Building Structures,2008,29(5):67-74.
[16]聂建国,王宇航,樊健生.钢管混凝土柱轴压力-弯矩-扭矩空间复合受力拟静力试验研究[J].建筑结构学报,2012,33(9):1-11.NIE Jianguo,WANG Yuhang,FAN Jiansheng.Experimental study on concrete filled steel tubular columns under combined compression,flexure and tension[J].Journal of Building Structures,2012,33(9):1-11.
[17]王琦,李术才,王汉鹏,等.可缩式钢管混凝土支架力学性能及经济效益[J].山东大学学报(工学版),2011,41(5):103-107.WANG Qi,LI Shucai,WANG Hanpeng,et al.Mechanical property and economic effect of contractible concrete filled steel tube support[J].Journal of Shandong University(Engineering Science),2011,41(5):103-107.
[18]李为腾,王琦,李术才,等.方钢约束混凝土拱架套管节点抗弯性能试验研究[J].中国矿业大学学报,2015,44(6):1072-1083.LI Weiteng,WANG Qi,LI Shucai,et al.Test study on bending properties of casing joint of square confined concrete arch support[J].Journal of China University of Mining&Technology,2015,44(6):1072-1083.