Civil Engineering |
|
|
|
|
Deformation properties of concrete under quasi plane stress sate |
LI Jing, WANG Zhe |
School of Civil Engineering, Beijing Jiao Tong University, Beijing 100044, China |
|
|
Abstract
The specimens (cubes, d=100 mm) were statically loaded into a true triaxial apparatus. 1) The stresses in all three directions were simultaneously increased to a specified value of p. 2) The strain in Y-axis was increased monotonically while maintaining a constant minimum principle stress in Z-axis as well as a constant strain rate ratio between the X-axis and the Y-axis. Three different values of p were chosen, which were 10, 15 and 20 MPa. Three or four strain rate ratios were chosen, which were 0.25, 0.5, 0.75 and 1.0, for each value of p. According to analysis of experimental data and curves, the following conclusions were obtained. In the latter part of loading process, relationship between Z-axial strain and Y-axial strain approximates to linear, as well as the relationship between Z-axial strain and X-axial strain, but the corresponding slopes of fitting lines are different with each other under different load paths. Comparing differential equations with fitting equations of curves, when the minimum principal stress is constant, the same numerical differentiation of Z-axial strain versus X-axial strain and Z-axial strain versus Y-axial strain are calculated for different strain rate ratios, which is related to failure modes and inclination of shear bands.
|
Published: 25 April 2017
|
|
|
Cite this article:
LI Jing, WANG Zhe. Deformation properties of concrete under quasi plane stress sate. JOURNAL OF ZHEJIANG UNIVERSITY (ENGINEERING SCIENCE), 2017, 51(4): 745-751.
|
似平面应力条件下混凝土的变形特性
采用真三轴设备对100 mm×100 mm×100 mm的立方体混凝土试块进行静态加载:1)保持3个轴向的应力相同,施加应力到试验设计值p;2)在保持最小主应力(Z轴)恒定,并且X轴应变速率与Y轴应变速率之比恒定的条件下,单调地增加Y轴应变.p的取值有三档,分别为10、15和20 MPa;每一档p对应的应变速率比的取值有三档或四档,在0.25、0.5、0.75和1.0中选取.分析试验曲线和数据可知:在加载过程的后半部分,Z轴应变和Y轴应变之间以及Z轴应变和X轴应变之间都近似呈线性关系,但是不同加载路径对应不同的拟合直线斜率.结合相关的微分方程可知,当最小主应力相同,加载应变速率比不同时,可以将Z轴应变分别对X轴和Y轴应变的微分关系回归出相同的数值,它们与破坏形态和剪切带倾角有关.
|
|
[1] KUPFER H B, HILSDRF H K, RUSCH H. Behavior of concrete under biaxial stresses [J]. ACI Materials Journal, 1969, 66(8): 656-666.
[2] 覃丽坤, 宋玉普, 张众, 等. 普通混凝土在非比例加载双轴压下的力学性能试验研究[J]. 建筑结构学报,2008, 20(增l): 74-77.
TAN Li-kun, SONG Yu-pu, ZHANG Zhong, et al. Experimental study on the biaxial mechanical behavior of normal concrete under non-proportion loading [J]. Journal of Building Structure, 2008, 20(supple.l): 74-77.
[3] 覃丽坤,宋玉普,姚家伟,等.普通混凝土双轴强度和变形的试验与理论研究[J],大连民族学院学报,2006,5(34): 14-16.
TAN Li-kun, SONG Yu-pu, YAO Jia-wei, et al. Experimental and theretical study on biaxial strength and deformation of normal concrete [J]. Journal of Dalian Nationalities University, 2006, 5(34): 14-16.
[4] 王浩,王立成,宋玉普.饱和大骨料混凝土动态双轴受压力学性能试验研究[J].大连理工大学学报,2016,56(1): 13-19.
WANG Hao, WANG Li-cheng, SONG Yu-pu. Experimental study of dynamic behavior of saturated dam concrete under biaxial compression [J]. Journal of Dalian University of Technology, 2016, 56(1): 13-19.
[5] 杨健辉,汪洪菊,孟海平,等.高强钢纤维碳纳米管混凝土双轴受压试验与破坏准则[J].土木工程学报,2016,49(11): 35-44.
YANG Jian-hui, WANG Hong-ju, MENG Hai-ping, et al. Biaxial compression tests and failure criteria for high strength steel fiber and carbon nanotube reinforced concrete [J]. China Civil Engineering Journal, 2016, 49(11): 35-44.
[6] JAN G M, VAN MIER J G M. Multiaxial strain-softening of concrete. Part I: fracture [J]. Materials and Structure, 1986, 19(111): 179-190.
[7] REN X D, YANG W Z, ZHOU Y, et al. Behavior of highperformance concrete under uniaxial and biaxial loading [J]. ACI Materials Journal, 2008, 105(6):548-557.
[8] 余自若,安明喆,王志建.双轴压下活性粉末混凝土力学性能[J].建筑材料学报,2011, 14(3): 305-309.
YU Zi-ruo, AN Ming-zhe, WANG Zhi-jian. Mechanical properties of reactive powder concrete under biaxial compression [J]. Journal of Building Materials, 2011, 14(3): 305-309.
[9] 李木国,张群,王静,等.大型液压伺服混凝土静动三轴试验机[J].大连理工大学学报,2003, 43(6): 812-817.
LI Mu-guo, ZHANG Qun, WANG Jing, et al. Large scale static and dynamic concrete hydraulic servo triaxial testing equipment [J]. Journal of Dalian University of Technology, 2003, 43(6): 812-817.
[10] 王哲.平面应变状态下混凝土力学行为的三轴试验研究[J].土木工程学报,2012, 45(10): 62-71.
WANG Zhe. Triaxial experimental study of the mechanical behavior of concrete in plane strain state [J]. China Civil Engineering Journal, 2012, 45(10): 62-71. |
|
Viewed |
|
|
|
Full text
|
|
|
|
|
Abstract
|
|
|
|
|
Cited |
|
|
|
|
|
Shared |
|
|
|
|
|
Discussed |
|
|
|
|