再生粗骨料混凝土应力-应变关系  

STRESS-STRAIN RELATIONSHIP OF RECYCLED COARSE AGGREGATE CONCRETE

作　　者：肖建庄[1,2,3] 唐宇翔 张凯建 杨海峰 XIAO Jian-zhuang;TANG Yu-xiang;ZHANG Kai-jian;YANG Hai-feng(College of Civil Engineering,Tongji University,Shanghai 200092,China;College of Civil and Architecture Engineering,Guangxi University,Nanning 530004,China;Institute of Science and Technology for Carbon Peak&Neutrality,Nanning 530004,China;College of Civil Engineering,Fuzhou University,Fuzhou 350108,China)

机构地区：[1]同济大学土木工程学院,上海200092 [2]广西大学土木建筑工程学院,南宁530004 [3]广西大学双碳科学与技术研究院,南宁530004 [4]福州大学土木工程学院,福州350108

出　　处：《工程力学》2024年第2期43-55,共13页Engineering Mechanics

基　　金：国家自然科学基金项目(51325802,51178340,52078358,52008304,52178123);国家重点研发计划项目(2022YFE0198300,2022YFC3803400)。

摘　　要：再生粗骨料混凝土应力-应变关系是实现其材料到结构力学分析的桥梁纽带,成为再生粗骨料混凝土结构基础理论的基石。介绍了作者团队多年来在再生粗骨料混凝土应力-应变关系方面取得的研究进展:采用模型化再生粗骨料方法,研究了复杂界面过渡区对再生粗骨料混凝土破坏行为的影响,揭示了再生粗骨料混凝土细观损伤本质与演化机理;从静力作用到动力作用,系统地开展了不同工况下再生粗骨料混凝土应力-应变行为试验研究,探明了载荷条件对再生粗骨料混凝土应力与变形的影响规律并建立了相适应的力学与数学模型;进一步考虑再生粗骨料性能时空变异性,发现了再生粗骨料混凝土力学响应的概率分布特征,提出了再生粗骨料混凝土随机损伤本构关系;基于获得的本构模型,完成了再生粗骨料混凝土构件时变可靠度分析和结构动力非线性分析,为再生粗骨料混凝土在实际工程中的安全应用提供了理论支撑;提炼了相关研究结论并对未来研究工作进行了展望。The stress-strain relationship of recycled coarse aggregate concrete is the bridge to realize its mechanical analysis from material level to structural level,and becomes the cornerstone of the basic theory of recycled coarse aggregate concrete structure.The research progress made by the author's group in the stress-strain relationship of recycled coarse aggregate concrete over the years was introduced.The influence of complex interfacial transition zones on the failure behavior of recycled coarse aggregate concrete was investigated by using the method of modeling recycled coarse aggregate,and the microscopic damage and evolutionary mechanism of recycled coarse aggregate concrete were revealed.From static to dynamic loading,the experimental studies of stress-strain behaviors of recycled coarse aggregate concrete were carried out systematically under different working conditions,the influence of loading conditions on the internal stress and deformation of recycled coarse aggregate concrete was investigated,and the corresponding mechanical and mathematical models were established.Furthermore,considering the temporal and spatial variability of the performance of recycled coarse aggregates,the probabilistic distribution characteristics of the mechanical response of recycled coarse aggregate concrete were found,and the stochastic damage constitutive relationship of recycled coarse aggregate concrete was proposed.Based on the obtained constitutive model,the time-dependent reliability analysis and dynamic nonlinear analysis of recycled coarse aggregate concrete components and structures were carried out,providing theoretical support for the safe application of recycled coarse aggregate concrete in practical engineering.Relevant conclusions were extracted and future research work was prospected.

关 键 词：再生粗骨料混凝土 应力-应变关系 多工况受力 随机性 时变可靠度 非线性分析 

分 类 号：TU528.01[建筑科学—建筑技术科学]