疲劳荷载作用对高性能混凝土收缩徐变影响的试验研究
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摘要
混凝土徐变是指在持续荷载作用下,混凝土及其结构的变形随时间不断增加的现象。桥梁在服役期间会受到疲劳荷载作用,导致材料性能劣化,但是目前关于疲劳荷载作用对收缩徐变影响的研究较少。对比分析了经历和未经历疲劳荷载作用的高性能混凝土收缩徐变性能,研究疲劳荷载作用对高性能混凝土收缩徐变性能的影响。试验结果表明,疲劳荷载作用会改变收缩和徐变的发展规律,表现在会增加早期收缩应变,缩短进入徐变平稳期的时间,增大徐变平稳期后混凝土徐变应变增加速率。
Concrete creep is the phenomenon that the deformation of concrete and its structure increases with time under sustained load.The bridge will be subjected to fatigue loading during service,resulting in deterioration of material performance.But there are few researches on the concrete effecting of fatigue loading on shrinkage and creep.In this paper,the shrinkage and creep performance of high performance concrete which had experienced and not experienced fatigueloading is analyzed comparatively to study the effect of fatigue loading on the shrinkage and creep performance of high performance concrete.The experimental results show that the fatigue loading will change the development of shrinkage and creep,including shorting the time of entering the creep stable period,increasing early shrinkage strain and increasing the creep strain increase rate of concrete after the time of the creep stable period.
Concrete creep is the phenomenon that the deformation of concrete and its structure increases with time under sustained load.The bridge will be subjected to fatigue loading during service,resulting in deterioration of material performance.But there are few researches on the concrete effecting of fatigue loading on shrinkage and creep.In this paper,the shrinkage and creep performance of high performance concrete which had experienced and not experienced fatigueloading is analyzed comparatively to study the effect of fatigue loading on the shrinkage and creep performance of high performance concrete.The experimental results show that the fatigue loading will change the development of shrinkage and creep,including shorting the time of entering the creep stable period,increasing early shrinkage strain and increasing the creep strain increase rate of concrete after the time of the creep stable period.
引文
[1]颜东煌,田仲初,李学文,等.混凝土桥梁收缩徐变计算的有限元方法与应用[J].中国公路学报,2004,17(2):55-58.
[2]郭磊,陈守开,白卫峰,等.混凝土早龄期拉伸徐变的预测与仿真[J].混凝土,2016(5):26-34.
[3]罗许国,钟新谷,戴公连.高性能混凝土梁长期变形性能试验研究[J].铁道科学与工程学报,2005,2(4):45-49.
[4]林波.混凝土收缩徐变及其效应的计算分析和试验研究[D].南京:东南大学,2006.
[5]赵启林,陈立,翟可为,等.复杂状态下桥用高强混凝土收缩徐变性能试验[J].解放军理工大学学报(自然科学版),2011,12(5):459-465.
[6]陈明宪,彭建新,颜东煌,等.钢管混凝土拱桥收缩徐变问题综述[J].长沙交通学,2004,20(2):19-24.
[7] GIANLUCA R,GRAZIZNO L,RICCARDO Z.State of the art on the time-dependent behaviour of composite steel-concrete structures[J].Journal of Constructional Steel Rescarch,2013(80):252-263.
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[9]宋玉普.混凝土结构的疲劳性能及设计原理[M].北京:机械工业出版社,2006.
[10]郭蒙蒙,冯仲仁,王雄江.侧压作用下混凝土的拉压疲劳性能[J].建筑材料学报,2017,20(2):266-270.
[11]郑克仁,孙伟,张云升,等.混凝土疲劳裂缝的研究[J].武汉理工大学学报,2006,28(8):39-42.
[12]刘国忠.高性能混凝土疲劳特性研究[J].桥梁施工与机械,2013(5):89-92.
[13]田立宗,逯静洲,朱孔峰,等.冻融循环与疲劳荷载作用下混凝土损伤研究[J].长江科学院院报,2017(34):1-7.
[14]刘波.疲劳对配筋混凝土梁的使用性能影响分析[D].西安:长安大学,2008.
[15]MOW V C,KUEI S C,LAI W M,et al.Biphasic creep and stress relaxation of articular cartilage in compression:theory and experiments[J].Journal of biomechanical engineering,1980,102(1):73-84.
[16]NEVILLE A M,DILGER W H,BROOKS J J.(1983):Creep of plan and structural concrete[M].Construction Press,Logman Group Limited,London and New York.
[2]郭磊,陈守开,白卫峰,等.混凝土早龄期拉伸徐变的预测与仿真[J].混凝土,2016(5):26-34.
[3]罗许国,钟新谷,戴公连.高性能混凝土梁长期变形性能试验研究[J].铁道科学与工程学报,2005,2(4):45-49.
[4]林波.混凝土收缩徐变及其效应的计算分析和试验研究[D].南京:东南大学,2006.
[5]赵启林,陈立,翟可为,等.复杂状态下桥用高强混凝土收缩徐变性能试验[J].解放军理工大学学报(自然科学版),2011,12(5):459-465.
[6]陈明宪,彭建新,颜东煌,等.钢管混凝土拱桥收缩徐变问题综述[J].长沙交通学,2004,20(2):19-24.
[7] GIANLUCA R,GRAZIZNO L,RICCARDO Z.State of the art on the time-dependent behaviour of composite steel-concrete structures[J].Journal of Constructional Steel Rescarch,2013(80):252-263.
[8]蒲心诚.超高强高性能混凝土[M].重庆:重庆大学出版社,2004.
[9]宋玉普.混凝土结构的疲劳性能及设计原理[M].北京:机械工业出版社,2006.
[10]郭蒙蒙,冯仲仁,王雄江.侧压作用下混凝土的拉压疲劳性能[J].建筑材料学报,2017,20(2):266-270.
[11]郑克仁,孙伟,张云升,等.混凝土疲劳裂缝的研究[J].武汉理工大学学报,2006,28(8):39-42.
[12]刘国忠.高性能混凝土疲劳特性研究[J].桥梁施工与机械,2013(5):89-92.
[13]田立宗,逯静洲,朱孔峰,等.冻融循环与疲劳荷载作用下混凝土损伤研究[J].长江科学院院报,2017(34):1-7.
[14]刘波.疲劳对配筋混凝土梁的使用性能影响分析[D].西安:长安大学,2008.
[15]MOW V C,KUEI S C,LAI W M,et al.Biphasic creep and stress relaxation of articular cartilage in compression:theory and experiments[J].Journal of biomechanical engineering,1980,102(1):73-84.
[16]NEVILLE A M,DILGER W H,BROOKS J J.(1983):Creep of plan and structural concrete[M].Construction Press,Logman Group Limited,London and New York.