型钢混凝土界面试验研究及损伤分析
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摘要
研究目的:既有关于型钢混凝土组合结构界面粘结关系的研究大多采用有限元模拟或利用推出试验的结果进行拟合分析,而理论研究多未考虑界面损伤对粘结的影响。为得到能真实反映界面粘结情况的粘结力模型,本文基于型钢混凝土推出试验结果,提出界面粘结力模型,并引入界面损伤的概念,分析界面破坏全过程的界面应力演化规律。研究结论:(1)不同试件界面极限承载力因界面粘结情况不同而存在差异,界面破坏后,混凝土对型钢的握裹力基本保持不变,且混凝土与型钢间的动摩擦系数为恒定值;(2)界面所处的状态可分为弹性、损伤及剥离三种状态,粘结力模型参数推荐取值为:界面粘结承载力0. 818 7 MPa,界面摩阻力0. 391 4 MPa;(3)全界面破坏过程将经历完全弹性阶段、弹性-损伤阶段、弹性-损伤-滑移阶段、损伤-滑移阶段、滑移阶段五个阶段;(4)在完全弹性阶段,粘结力的最小值出现在自由端附近而非自由端处;(5)本研究成果可为型钢混凝土组合结构设计中界面粘结关系及界面应力演变规律的确定提供参考。
Research purposes: The research on the interfacial bonding relationship of steel reinforced concrete composite structures is mostly carried out by finite element simulation or fitting analysis using the results of the experimental results. And,the influence of interface damage on bonding is not considered in theoretical research. In order to obtain the interface cohesion model which can truly reflect the interface bonding condition,based on the results of the steel reinforced concrete push-out test,the interface cohesion model is proposed and the concept of interface damage is introduced. The evolution law of interface stress in the whole process of interface failure is analyzed.Research conclusions:( 1) The ultimate interface bearing capacity of different specimens varies with interface bonding condition. After the interface failure,the wrapping force of concrete to section steel remains basically unchanged and the dynamic friction coefficient between concrete and steel is constant.( 2) The state of the interface can be divided into three states: elastic state,damage state,and peeling state. The recommended values of the interface cohesion model parameters are: interface bond capacity 0. 818 7 MPa; interface friction resistance 0. 391 4 MPa.( 3) The whole interface failure process will go through five stages: fully elastic stage,elastic-damage stage,elastic-damage-slip stage,damage-slip stage and slip stage.( 4) In the fully elastic stage,the minimum bonding force appears near the free end,not at the free end.( 5) The research results can provide a reference for determining the interfacial bond relationship and the evolution law of interfacial stress in the design of steel reinforced concrete composite structures.
Research purposes: The research on the interfacial bonding relationship of steel reinforced concrete composite structures is mostly carried out by finite element simulation or fitting analysis using the results of the experimental results. And,the influence of interface damage on bonding is not considered in theoretical research. In order to obtain the interface cohesion model which can truly reflect the interface bonding condition,based on the results of the steel reinforced concrete push-out test,the interface cohesion model is proposed and the concept of interface damage is introduced. The evolution law of interface stress in the whole process of interface failure is analyzed.Research conclusions:( 1) The ultimate interface bearing capacity of different specimens varies with interface bonding condition. After the interface failure,the wrapping force of concrete to section steel remains basically unchanged and the dynamic friction coefficient between concrete and steel is constant.( 2) The state of the interface can be divided into three states: elastic state,damage state,and peeling state. The recommended values of the interface cohesion model parameters are: interface bond capacity 0. 818 7 MPa; interface friction resistance 0. 391 4 MPa.( 3) The whole interface failure process will go through five stages: fully elastic stage,elastic-damage stage,elastic-damage-slip stage,damage-slip stage and slip stage.( 4) In the fully elastic stage,the minimum bonding force appears near the free end,not at the free end.( 5) The research results can provide a reference for determining the interfacial bond relationship and the evolution law of interfacial stress in the design of steel reinforced concrete composite structures.
引文
[1]赵鸿铁.钢与混凝土组合结构[M].北京:科学出版社,2001.Zhao Hongtie.Steel-concrete Composite Structure[M].Beijing:Science Press,2001.
[2]李红,安建利,姜维山.型钢与混凝土粘结性能的试验研究[J].哈尔滨建筑工程学院学报,1993(S1):214-223.Li Hong,An Jianli,Jiang Weishan.An Experimental Investigation on Bond Behavior between Steel and Concrete[J].Journal of Harbin University of Civil Engineering and Architecture,1993(S1):214-223.
[3]Bryson J O,Mathey R G.Surface Condition Effect on Bond Strength of Steel Beams in Concrete[J].Journal of ACI,1962(3):397-406.
[4]杨勇,赵鸿铁,薛建阳.型钢混凝土粘结滑移性能试验分析[J].西安建筑科技大学学报:自然科学版,2002(3):205-209.Yang Yong,Zhao Hongtie,Xue Jianyang.Experimental Analysis of Bond-slip Performance of Steel Reinforced Concrete[J].Journal of Xi'an University of Architecture&Technology:Natural Science Edition,2002(3):205-209.
[5]郑山锁,邓国专,杨勇,等.型钢混凝土结构粘结滑移性能试验研究[J].工程力学,2003(5):63-69.Zheng Shansuo,Deng Guozhuan,Yang Yong,etc.Experimental Study on Bond-slip Performance between Steel and Concrete in SRC Structures[J].Engineering Mechanics,2003(5):63-69.
[6]薛建阳,赵鸿铁,杨勇,等.型钢混凝土柱粘结滑移性能及ANSYS数值模拟方法研究[J].建筑钢结构进展,2006(5):8-16.Xue Jianyang,Zhao Hongtie,Yang Yong,etc.Research on Bond-slip Behavior and Numerical Simulation of Steel Reinforced Concrete Columns by ANSYS Program[J].Progress in Steel Building Structures,2006(5):8-16.
[7]殷小溦.型钢混凝土粘结-滑移推出试验的理论分析[J].结构工程师,2010(3):48-53.Yin Xiaowei.Theoretical Analysis of Push-out Test on Bond-slip Relation between Shaped Steel and Concrete in SRC Strustures[J].Structural Engineers,2010(3):48-53.
[2]李红,安建利,姜维山.型钢与混凝土粘结性能的试验研究[J].哈尔滨建筑工程学院学报,1993(S1):214-223.Li Hong,An Jianli,Jiang Weishan.An Experimental Investigation on Bond Behavior between Steel and Concrete[J].Journal of Harbin University of Civil Engineering and Architecture,1993(S1):214-223.
[3]Bryson J O,Mathey R G.Surface Condition Effect on Bond Strength of Steel Beams in Concrete[J].Journal of ACI,1962(3):397-406.
[4]杨勇,赵鸿铁,薛建阳.型钢混凝土粘结滑移性能试验分析[J].西安建筑科技大学学报:自然科学版,2002(3):205-209.Yang Yong,Zhao Hongtie,Xue Jianyang.Experimental Analysis of Bond-slip Performance of Steel Reinforced Concrete[J].Journal of Xi'an University of Architecture&Technology:Natural Science Edition,2002(3):205-209.
[5]郑山锁,邓国专,杨勇,等.型钢混凝土结构粘结滑移性能试验研究[J].工程力学,2003(5):63-69.Zheng Shansuo,Deng Guozhuan,Yang Yong,etc.Experimental Study on Bond-slip Performance between Steel and Concrete in SRC Structures[J].Engineering Mechanics,2003(5):63-69.
[6]薛建阳,赵鸿铁,杨勇,等.型钢混凝土柱粘结滑移性能及ANSYS数值模拟方法研究[J].建筑钢结构进展,2006(5):8-16.Xue Jianyang,Zhao Hongtie,Yang Yong,etc.Research on Bond-slip Behavior and Numerical Simulation of Steel Reinforced Concrete Columns by ANSYS Program[J].Progress in Steel Building Structures,2006(5):8-16.
[7]殷小溦.型钢混凝土粘结-滑移推出试验的理论分析[J].结构工程师,2010(3):48-53.Yin Xiaowei.Theoretical Analysis of Push-out Test on Bond-slip Relation between Shaped Steel and Concrete in SRC Strustures[J].Structural Engineers,2010(3):48-53.