登录
注册
E-alert
登录
注册
E-alert
Mechanical Properties of Fly Ash Concrete After Creep and Being Subjected to Different Stresses
-
摘要: 为研究持续荷载作用对粉煤灰混凝土静力性能的影响,以天津地铁6号线渌水道站为工程背景,进行了不同持荷时间、不同持荷应力条件下混凝土轴压徐变和徐变后静力性能的测试,同时进行了同环境条件下无持荷混凝土收缩和收缩后的静力性能测试。试验结果表明:在15%和30%应力级别下,随着持荷时间延长,混凝土弹性模量会逐渐增加,其增长速率随着持荷时间的增加而减小;相同环境条件下,无持荷收缩试件的弹性模量也有一定增长,数值较30%应力级别持荷试件低5%左右。随着持荷时间的延长,混凝土徐变后的应力-应变曲线弹性阶段的斜率增大,峰值应力也增大;相同环境条件下,无持荷收缩试件的应力-应变曲线弹性阶段的斜率也会增大,峰值应力低于徐变试件,峰值应力增长不明显,增长幅度为徐变试件增长幅度的65%左右。Abstract: In order to research the influence of sustained loads on the mechanical properties of concrete, taking the Tianjin Metro Line 6 Lushuidao station as the engineering background, the creep development of concrete under different sustained times and sustained stresses was tested, as well as the static performance of concrete after creep. At the same time, the static loading test for shrinkage specimens with the same environmental conditions of creep specimens was also carried out. The results showed that under 15% and 30% stress level, the elastic modulus of concrete after creep increased gradually with the sustained time, but its increase rate reduced. The elastic modulus of shrinkage specimens under the same environmental conditions also had a certain growth, and the value was about 5% lower than that of holding specimens at 0.3 stress level. With the increase of sustained time, the slope of the stress-strain curve of concrete after creep increased in the elastic stage, and the peak stress also increased. Under the same environmental conditions, the slope of the stress-strain curve of the shrinkage specimen without sustained loads also increased in the elastic stage, the peak stress was lower than that of the creep specimen, which was about 65% of that of the creep specimen.
-
Key words:
- concrete /
- mechanical properties /
- shrinkage /
- creep /
- constitutive
-
[1] 北京市规划委员会.地铁设计规范:GB 50157-2013[S].北京:中国建筑工业出版社,2014. [2] WANG Y F,ZHANG D J.Creep-effect on mechanical behavior of concrete confined by FRP under axial compression[J].Journal of Engineering Mechanics,2009,135(11):1315-1322. [3] NEVILLE A M,DILGER W H,BROOKS J J.Creep of Plain and Structural Concrete[M].London:Construction Press,1983. [4] 刘红彬,鞠杨,孙华飞,等.硅灰掺量对活性粉末混凝土力学性能的影响[J].工业建筑,2015,45(4):132-135. [5] 罗俊礼,徐志胜,熊伟.再生骨料高性能混凝土收缩徐变对比试验研究[J].工业建筑,2014,44(1):79-83,8. [6] TASEVSKI D.Time-dependent strength of concrete in compression and shear[R].EPFL,2019. [7] 曾滨,潘钻峰,曹栋,等.不同应力水平对混凝土徐变性能的影响[J].工业建筑,2019,49(11):163-168. [8] 于润泽,李杰,司炳君.荷载水平对长期加载作用下混凝土剩余承载力的影响[J].水利与建筑工程学报,2020,18(3):14-18. [9] 马娇娇,张戎令,杨霞林,等.强度和温度对钢管混凝土徐变性能的试验研究[J].混凝土,2019(3):23-26,29. [10] COUTINHO A S.A contribution to the mechanism of concrete creep[J].Matériaux et Construction,1977,10(1):3-16. [11] HAN B,LIU M H,XIE H B,et al.A strength developing model of concrete under sustained loads[J].Construction and Building Materials,2016,105:189-195. [12] JIA S Y,LIU M H,HAN B,et al.An elastic modulus developing model of fly ash concrete under sustained load[J].KSCE Journal of Civil Engineering,2017:1-8. [13] 刘巽伯.粉煤灰陶粒混凝土的弹性恢复和徐变恢复特征[J].混凝土,2003(8):20-21,24. [14] 侯东伟,张君,陈浩宇,等.干燥与潮湿环境下混凝土抗压强度和弹性模量发展分析[J].水利学报,2012,43(2):198-208. [15] NEVILLE A M.Properties of Concrete[M].London:Pitman,1973. [16] 勾煜.粉煤灰对蒸养混凝土抗压强度的影响[J].混凝土,2021(7):86-89. [17] 任旭凯,李政.不同粉煤灰掺量对混合骨料湿拌砂浆性能的影响[J].混凝土,2021(5):96-99. [18] 中华人民共和国住房和城乡建设部.普通混凝土力学性能试验方法标准:GB 50081-2002[S].北京:中国建筑工业出版社出版,2003. [19] 中华人民共和国住房和城乡建设部.普通混凝土长期性能和耐久性能试验方法标准:GB/T 50082-2009[S].北京:中国建筑工业出版社,2009. [20] 过镇海,时旭东.钢筋混凝土原理和分析[M].北京:清华大学出版社,2003. [21] 曾榕,陈慕杰,黄美玲,等.大掺量粉煤灰混凝土应力-应变关系[J].桂林理工大学学报,2015,35(1):86-90. [22] 曹健.轴压荷载下干湿循环-硫酸盐侵蚀耦合作用混凝土长期性能[D].北京:北京交通大学,2013. [23] 童立强.轴压荷载和硫酸盐侵蚀耦合作用下粉煤灰混凝土长期性能研究[D].烟台:烟台大学,2019. [24] 刘国军,杨永清,魏召兰.时变效应导致的混凝土损伤研究进展[J].材料导报,2014,28(9):92-97. -
点击查看大图
计量
- 文章访问数: 102
- HTML全文浏览量: 24
- PDF下载量: 2
- 被引次数: 0
下载:
