干燥和饱和状态下混凝土动静态压缩性能试验研究及其本构关系*
- 摘 要
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(1 合肥工业大学土木与水利工程学院，合肥 230009； 2 中国科技大学近代力学系，合肥 230027；3 安徽省土木工程结构与材料省级实验室，合肥 230009)
［摘要］为研究干燥和饱和状态下混凝土的应力-应变关系，利用MTS试验机和大口径分离式Hopkinson压杆(SHPB)装置进行了一系列的动静态的混凝土试验。结果表明，干燥和饱和状态下混凝土的峰值应力随围压增大而提高，且峰值应力随应变率增大而提高，饱和状态下混凝土较干燥状态下混凝土峰值应力小、变形能力强。采用Hsieh-Ting-Chen四参数破坏准则，基于简化的单轴损伤演化方程，建立了混凝土的损伤本构模型，该模型参数易得，模型曲线与不同条件下的试验曲线基本一致，便于实际工程中应用。［关键词］混凝土; 压缩; 损伤模型; 本构关系中图分类号：TU528.1， O346.5 文献标识码：A 文章编号：1002-848X(2015)12-0023-05
Study on dynamic and static compression performance of concrete for dry and saturated state and its constitutive relationshipZhang Yongliang1,2,3, Zhu Dayong1,3, Yao Huayan1,2,3, Li Yongchi2, Gao Guangfa2, Ying Guozhu1,3(1 School of Civil Engineering, Hefei University of Technology, Hefei 230009, China; 2 Department of Modern Mechanics, University of Science and Technology of China, Hefei 230027, China; 3 Anhui Key Laboratory of Civil Engineering and Materials, Hefei 230009, China）Abstract: To study the stress-strain relationship of dry and saturated state concrete, a series of dynamic and static tests of concrete were taken by using the MTS tester and the large diameter split Hopkinson pressure bar (SHPB) device. The results show that the peak stress of dry and saturated concrete increases with the confining pressure increasing and raises with the strain rate increasing. The peak stress is smaller under saturated state than under dry state with stronger deformation ability. Based on the simplified damage evolution equation of single axis by using Hsieh-Ting-Chen four parameters failure criterion, a concrete damage constitutive model was established, the parameters of which were easy to be got. The model curve and test curve under different conditions are basically the same. The application of the model is convenient in practical engineering.Keywords:concrete; compression; damage model; constitutive relationship
*国家自然科学基金项目（51078123，11102205，11202206， 41402256）。作者简介：张永亮，硕士研究生，Email：docter88zhang@163.com。
