混凝土棱柱体试件抗压强度尺寸效应探讨
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摘要
现行《水工混凝土试验规程》(DL/T 5150—2001)并未对高应力比条件下混凝土徐变试验棱柱体试件的抗压强度尺寸效应作出明确规定,因此从定性和定量的角度探讨棱柱体试件的尺寸效应问题。通过对15个同截面、不同高度的混凝土棱柱体试件进行抗压强度试验,较系统研究了试件纵向高度与横向长度比值和抗压强度的关系,得到棱柱体试件抗压强度尺寸效应的临界尺寸。收集大量临界尺寸范围内混凝土棱柱体试件抗压强度试验资料,建立了混凝土尺寸效应广义回归隐式神经网络模型,计算分析结果表明:规范中抗压强度折算系数无法满足高应力比下徐变试验荷载加载要求,可利用本文建立的隐式神经网络模型预测不同尺寸的混凝土试件的抗压强度比值进行高应力比下的徐变试验。
In view of the existing concrete test specification,the size effect on compressive strength ratio of the prism concrete specimen in the creep experiment under high stress has not been explained. Therefore,this article did further research from the perspective of qualitative and quantitative to prism specimen's size effect issue,first of all,15 group prism specimens with same cross section and different heights of the compressive strength experiment,systematically studied the relationship between vertical height of the specimens and the compressive strength,got the critical size of compressive strength size effect of prism specimens;Then collected a large number of critical dimension within the scope of prism compressive strength experiment data and the generalized regression implicit network model of size effect of concrete was established. The calculation and analysis results show that the compressive strength reduction factor specified in the specifications can't meet the requirements of the creep test under high stress,in this paper,building an implicit network model to predict different size of concrete compressive strength ratio of the specimens in the creep experiment under high stress can be used.
In view of the existing concrete test specification,the size effect on compressive strength ratio of the prism concrete specimen in the creep experiment under high stress has not been explained. Therefore,this article did further research from the perspective of qualitative and quantitative to prism specimen's size effect issue,first of all,15 group prism specimens with same cross section and different heights of the compressive strength experiment,systematically studied the relationship between vertical height of the specimens and the compressive strength,got the critical size of compressive strength size effect of prism specimens;Then collected a large number of critical dimension within the scope of prism compressive strength experiment data and the generalized regression implicit network model of size effect of concrete was established. The calculation and analysis results show that the compressive strength reduction factor specified in the specifications can't meet the requirements of the creep test under high stress,in this paper,building an implicit network model to predict different size of concrete compressive strength ratio of the specimens in the creep experiment under high stress can be used.
引文
[1]苏捷,方志.普通混凝土与高强混凝土抗压强度的尺寸效应[J].建筑材料学报,2013,16(6):1078-1081,1086.
[2]高志扬,许力,何林,等.高强混凝土抗压强度尺寸效应综述[J].混凝土,2011(5):33-35.
[3]钱觉时,杨再富,黄煜镔,等.高强混凝土强度尺寸效应的试验研究[J].华中科技大学学报(城市科学版),2004,21(1):1-4.
[4]周红.混凝土强度尺寸效应的实验研究[D].大连:大连理工大学,2010:66-67.
[5]王小川,史峰,郁磊.Matlab神经网络43个案例分析[M].北京:北京航空航天大学出版社,2013:67-69.
[6]苏捷,方志,杨钻.骨料组分和强度等级对混凝土单轴受压性能尺寸效应的影响[J].建筑结构学报,2014,35(5):120-127.
[7]邓旭华.水灰比对再生混凝土强度影响的试验研究[J].混凝土,2005(2):46-48.
[8]高丹盈,王勤学,李翔宇.龄期和尺寸对纤维矿渣微粉混凝土抗压强度的影响[J].工业建筑,2011,41(增刊1):739-742.
[9]钱觉时,黄煜镔.混凝土强度尺寸效应的研究进展[J].混凝土与水泥制品,2003(3):1-5.
[10]张立军,安明喆.混凝土强度的尺寸效应评述[J].煤炭工程,2005(10):51-53.
[11]周克荣,肖小松,吴晓涵.混凝土轴心抗压强度尺寸效应中的分形行为[J].福州大学学报(自然科学版),1996,24(增刊1):58-62.
[12]周青松,于清树,冯本秀.混凝土强度尺寸效应研究[J].矿业快报,2006(6):29-31,60.
[13]杨忠义.全级配混凝土强度的尺寸效应研究[J].水电站设计,2008,24(3):11-14.
[14]杨木秋,池元.混凝土试件尺寸效应机理[J].福州大学学报(自然科学版),1992,20(1):87-94.
[15]陈文耀,郑丹.全级配与湿筛混凝土抗压强度比值问题的探讨[J].长江科学院院报,2010,27(8):58-60,65.
[16]朱尔玉,杨威,王建海,等.不同形状尺寸C20混凝土试件抗压强度的关系[J].北京交通大学学报,2005,29(1):1-3,13.
[17]刘勇信,李振灵,田为军,等.岩石单轴抗压强度换算公式适用条件分析[J].人民黄河,2013,35(3):105-107.
[18]何淅淅,郑学成,林社勇.粉煤灰混凝土强度统计特性的试验研究[J].土木工程学报,2011,44(3):59-65.
[19]郑丹,韩巍巍,张寅.水工全级配与湿筛混凝土强度关系的研究[J].水利与建筑工程学报,2011,9(5):10-14,59.
[2]高志扬,许力,何林,等.高强混凝土抗压强度尺寸效应综述[J].混凝土,2011(5):33-35.
[3]钱觉时,杨再富,黄煜镔,等.高强混凝土强度尺寸效应的试验研究[J].华中科技大学学报(城市科学版),2004,21(1):1-4.
[4]周红.混凝土强度尺寸效应的实验研究[D].大连:大连理工大学,2010:66-67.
[5]王小川,史峰,郁磊.Matlab神经网络43个案例分析[M].北京:北京航空航天大学出版社,2013:67-69.
[6]苏捷,方志,杨钻.骨料组分和强度等级对混凝土单轴受压性能尺寸效应的影响[J].建筑结构学报,2014,35(5):120-127.
[7]邓旭华.水灰比对再生混凝土强度影响的试验研究[J].混凝土,2005(2):46-48.
[8]高丹盈,王勤学,李翔宇.龄期和尺寸对纤维矿渣微粉混凝土抗压强度的影响[J].工业建筑,2011,41(增刊1):739-742.
[9]钱觉时,黄煜镔.混凝土强度尺寸效应的研究进展[J].混凝土与水泥制品,2003(3):1-5.
[10]张立军,安明喆.混凝土强度的尺寸效应评述[J].煤炭工程,2005(10):51-53.
[11]周克荣,肖小松,吴晓涵.混凝土轴心抗压强度尺寸效应中的分形行为[J].福州大学学报(自然科学版),1996,24(增刊1):58-62.
[12]周青松,于清树,冯本秀.混凝土强度尺寸效应研究[J].矿业快报,2006(6):29-31,60.
[13]杨忠义.全级配混凝土强度的尺寸效应研究[J].水电站设计,2008,24(3):11-14.
[14]杨木秋,池元.混凝土试件尺寸效应机理[J].福州大学学报(自然科学版),1992,20(1):87-94.
[15]陈文耀,郑丹.全级配与湿筛混凝土抗压强度比值问题的探讨[J].长江科学院院报,2010,27(8):58-60,65.
[16]朱尔玉,杨威,王建海,等.不同形状尺寸C20混凝土试件抗压强度的关系[J].北京交通大学学报,2005,29(1):1-3,13.
[17]刘勇信,李振灵,田为军,等.岩石单轴抗压强度换算公式适用条件分析[J].人民黄河,2013,35(3):105-107.
[18]何淅淅,郑学成,林社勇.粉煤灰混凝土强度统计特性的试验研究[J].土木工程学报,2011,44(3):59-65.
[19]郑丹,韩巍巍,张寅.水工全级配与湿筛混凝土强度关系的研究[J].水利与建筑工程学报,2011,9(5):10-14,59.