似平面应力条件下混凝土的变形特性

发布时间：2018-01-08 17:13

本文关键词：似平面应力条件下混凝土的变形特性　出处：《浙江大学学报(工学版)》2017年04期 　论文类型：期刊论文

【摘要】：采用真三轴设备对100mm×100mm×100mm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.
[Abstract]:The concrete of 100mm * 100mm * 100mm three axle equipment test block static loading: 1) to keep the 3 axial stress, applied to test the design value of P stress; 2) to maintain the minimum principal stress (Z axis) and constant strain rate, X axis and Y axis should be the transmission ratio under the condition of constant monotonically increasing value of Y axial strain.P third gear, respectively 10,15 and 20 MPa; each file corresponding to the P strain rate ratio value is three or four, selected in 0.25,0.5,0.75 and 1. Analysis of the test data and the curve shows: in the latter part of the loading process the Z between the axial strain and axial strain and Y strain of Z axis and X axis strain is linear, but the slope of the regression line in different loading paths corresponding to different differential equation. With the minimum principal stress when the same load, the strain rate is not at the same time, Z can be divided into axial strain Do not regress the same values for the differential relationship between the X and Y axis strains, which are related to the form of failure and the dip angle of the shear band.

【作者单位】：北京交通大学土木建筑工程学院;
【基金】：国家自然科学基金资助项目(51279003,51078024)
【分类号】：TU528
【正文快照】： 混凝土作为常见的建筑材料,多应用于海洋和港口工程、高层建筑结构、核反应堆高压容器、水坝和地下及隧道工程等领域.这些结构物中的混凝土大多都处在复杂的二轴或者三轴受力状态.复杂受力状态下混凝土的力学特性与单轴差异性很大,因此对混凝土进行多轴试验研究很有实际意义.

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