钢纤维增强混凝土疲劳性能圆板试验研究
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摘要
通过30个素混凝土和钢纤维混凝土试件(其中包括10个素混凝土圆板和20个钢纤维混凝土圆板)的等幅疲劳圆板试验,研究素混凝土和钢纤维混凝土在各级荷载下的破坏特征、裂缝发展及变形情况,以及纤维种类、纤维含量和应力水平对混凝土疲劳寿命的影响,并分析了混凝土疲劳寿命的分布规律。试验结果表明:钢纤维混凝土破坏形态为由板底圆心向四周扩散的三条主裂缝; 5D和3D钢纤维的掺入能有效提高混凝土的疲劳寿命,且相同钢纤维含量和应力水平的情况下,5D钢纤维对混凝土疲劳寿命的提高作用比3D钢纤维更显著;钢纤维对混凝土疲劳寿命的提高作用在低应力水平下更显著;钢纤维含量对混凝土疲劳寿命的影响规律并非线性;素混凝土和5D钢纤维混凝土宜采用两参数威布尔分布拟合,3D钢纤维混凝土宜采用对数正态分布拟合。
Through the equal amplitude fatigue test of thirty concrete specimens to find the destruction characteristics,crack development and deformation of plain concrete specimens and steel fiber reinforced concrete specimens at all levels,which contain 10 plain concrete round panel specimens and 20 steel fiber reinforced concrete round panel specimens. The effects of fiber content,fiber type and stress level on the deformation and fatigue life of the specimens were analyzed. Fatigue life distribution of steel fiber reinforced concrete specimens was analyzed. The experimental results show that: when the steel fiber reinforced concrete specimens damaged,it has three main cracks. The addition of 5 D and 3 D steel fibers can effectively improve the fatigue life of concrete,and under the same steel fiber content and stress level,the effect of 5 D steel fibers on the fatigue life of concrete is more significant than that of 3 D steel fibers; the steel fiber content has a nonlinear effect on the fatigue life of the concrete; plain concrete and5 D steel fiber concrete obey the two parameter Weibull distribution better,3 D steel fiber reinforced concrete specimens obeys lognormal distribution more.
Through the equal amplitude fatigue test of thirty concrete specimens to find the destruction characteristics,crack development and deformation of plain concrete specimens and steel fiber reinforced concrete specimens at all levels,which contain 10 plain concrete round panel specimens and 20 steel fiber reinforced concrete round panel specimens. The effects of fiber content,fiber type and stress level on the deformation and fatigue life of the specimens were analyzed. Fatigue life distribution of steel fiber reinforced concrete specimens was analyzed. The experimental results show that: when the steel fiber reinforced concrete specimens damaged,it has three main cracks. The addition of 5 D and 3 D steel fibers can effectively improve the fatigue life of concrete,and under the same steel fiber content and stress level,the effect of 5 D steel fibers on the fatigue life of concrete is more significant than that of 3 D steel fibers; the steel fiber content has a nonlinear effect on the fatigue life of the concrete; plain concrete and5 D steel fiber concrete obey the two parameter Weibull distribution better,3 D steel fiber reinforced concrete specimens obeys lognormal distribution more.
引文
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[7]梅迎军,赵翔,代超,等.弯曲荷载作用下钢纤维聚合物混凝土疲劳寿命[J].公路交通科技,2015,32(9):20-25.
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[10] Fausto M,Giovanni P. Derivation of a simplified stress-crack width law for fiber reinforced concrete through a revised round panel test[J].Cement and Concrete Composites,2015,58:95-104.
[11] American society for testing and material,standard test method for flexural toughness of fiber reinforced concrete(using centrally loaded round panel)[S]. ASTM Committee C09. 42,West Conshohocken,PA,2003.
[12] GB 50152-2012.混凝土结构试验方法标准[S].北京:中国建筑工业出版社,2012.
[13] Medeiros A,Zhang X,Ruiz G,et al. Effect of the loading frequency on the compressive fatigue behavior of plain and fiber reinforced concrete[J]. International Journal of Fatigue,2015,70:342-350.
[14]高镇同,熊峻江.疲劳可靠性[M].北京:航空航天大学出版社,2002.
[2]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.
[3]赵燕茹,王志慧,谢业鹏,等.钢纤维钢筋混凝土梁弯曲性能与疲劳寿命试验研究[J].混凝土,2018(5):42-45+50.
[4]赵燕茹,苏颂,谢业鹏,等.钢纤维对钢筋混凝土梁弯曲韧性与疲劳损伤的影响[J].硅酸盐通报,2018,37(1):260-266.
[5]高丹盈,张明.疲劳荷载下钢筋钢纤维高强混凝土梁受压边缘累积残余应变计算方法[J].中国公路学报,2016,29(3):48-54.
[6]高丹盈,张明,朱海堂.钢筋钢纤维高强混凝土梁疲劳试验研究及刚度计算[J].建筑结构学报,2013,34(8):142-149.
[7]梅迎军,赵翔,代超,等.弯曲荷载作用下钢纤维聚合物混凝土疲劳寿命[J].公路交通科技,2015,32(9):20-25.
[8] Alessandro P F,Andrea G,Bernardino C. Fiber volume fraction and ductility index in fiber-reinforced concrete round determined panels[J].Procedia Structural Integrity,2016,2:2857-2864.
[9] Ciancio D,Manca M,Buratti N,et al. Structural and material properties of mini notched round determinate panels[J]. Construction and Building Materials,2016,113:395-403.
[10] Fausto M,Giovanni P. Derivation of a simplified stress-crack width law for fiber reinforced concrete through a revised round panel test[J].Cement and Concrete Composites,2015,58:95-104.
[11] American society for testing and material,standard test method for flexural toughness of fiber reinforced concrete(using centrally loaded round panel)[S]. ASTM Committee C09. 42,West Conshohocken,PA,2003.
[12] GB 50152-2012.混凝土结构试验方法标准[S].北京:中国建筑工业出版社,2012.
[13] Medeiros A,Zhang X,Ruiz G,et al. Effect of the loading frequency on the compressive fatigue behavior of plain and fiber reinforced concrete[J]. International Journal of Fatigue,2015,70:342-350.
[14]高镇同,熊峻江.疲劳可靠性[M].北京:航空航天大学出版社,2002.