| 田威*,党发宁,陈厚群.单轴压缩条件下混凝土细观损伤演化机理的CT试验研究[J].实验力学,2011,26(1):54~60 |
| 单轴压缩条件下混凝土细观损伤演化机理的CT试验研究 |
| Experimental Study of Concrete Meso-Damage Evolution Mechanism Based on Uniaxial Compression CT Method |
| 投稿时间：2010-04-12 修订日期：2010-07-16 |
| DOI： |
| 中文关键词: 混凝土 细观损伤 CT 损伤变量 本构模型 |
| 英文关键词:concrete meso-damage Computerized tomography damage variable constitutive model |
| 基金项目:国家自然科学基金资助项目(51009010),中央高校基本科研业务费专项基金(CHD2010JC114)和长安大学基础研究支持计划专项基金资助项目;建设部给水排水重点实验室开放基金资助 |
|
| 摘要点击次数: 507 |
| 全文下载次数: 293 |
| 中文摘要: |
| 混凝土是一种非均质的材料,在细观层次上将混凝土看作由骨料、砂浆和两者之间的界面组成的三相复合材料。本文在对混凝土进行单轴压缩试验的基础上,根据CT扫描图像反映的细观破损过程,分析了基于CT数平均值变化规律的特点;将混凝土材料的损伤过程进行了分段,提出了损伤变量的提取方法。随后结合试验得到的宏观应力应变曲线,经过拟合得到损伤变量与宏观应变的关系公式,建立了新的分段损伤演化方程及损伤本构模型。通过对比分析,验证了损伤变量的计算结果和试验结果整体吻合较好。以此深入研究了混凝土材料细观破损机理。 |
| 英文摘要: |
| Concrete is a heterogeneous material and may be considered as a three-phase composite consisting of aggregate, mortar and interface between aggregate and mortar from a mesoscopic view. The variation characteristics of CT average number were analyzed by CT scan images of meso-damage process, based on CT testing of concrete meso-damage evolution under unaxial compression. Concrete damage process may be divided into several stages, and the method of extracting the damage variable was proposed. Considering the experimentally obtained macro stress-strain curve, the relation between the damage variable and macro strain was obtained by data fitting. A new equation of damage evolution damage and a damage constitutive model were established. Through comparing and analyzing, the obtained theory results coincide well with the experimental results. So the concrete meso damage-fracture mechanism was deeply investigated. |
| 查看全文 下载PDF阅读器 |
| 关闭 |
|
|
|
|
|
