【作者】 车顺利；

【导师】 郑山锁；

【作者基本信息】 西安建筑科技大学 ， 防灾减灾工程及防护工程， 2006， 硕士

【摘要】 型钢混凝土结构以其优越的受力性能,良好的综合效益,成为本世纪工程结构的重要发展方向,在工业与民用建筑、桥梁结构等领域具有广阔的应用前景。型钢混凝土结构的各项性能取决于型钢和混凝土的性能,在型钢混凝土结构中以高强高性能混凝土(HSHPC)取代普通混凝土,可以保证两种不同性质的材料更好的协同工作,从而实现组合结构的可持续性发展。 目前国内外对高强高性能混凝土的研究较多,但大多数学者只是针对混凝土组料中的某一成分展开研究,而混凝土作为一种复合材料,在考虑各组分各自性质的同时,必须考虑其相关作用,通过微细观作用机理的分析,了解掌握材料微细观结构特征的变化,从而研制出适用于型钢混凝土组合结构的高强高性能混凝土;在混凝土本构关系方面,各国学者提出了多种本构模式,但彼此之间差异较大,且适用于普通混凝土的本构理论对高强高性能混凝土不一定适用,因此应对高强高性能混凝土的本构关系展开相应研究。 本文以研制适用于型钢混凝土组合结构的高强高性能混凝土为切入点,结合当前国内外高强高性能混凝土的研制情况,从材料学角度分析配制高强高性能混凝土所需原材料的性能,并对其作了初步的选择。结合实验研究,分析了不同配比或不同工艺参数材料对混凝土性能的影响,以寻求原材料的最佳组合条件,确定高强高性能混凝土最佳配合比。为寻求适用于型钢混凝土组合结构的高强高性能混凝土的本构关系,借助损伤力学和统计理论相关知识,分析了材料的受力破坏机理,得出含有损伤变量的材料本构关系,通过试验确定本构关系中的系数,并加以验证。该本构关系考虑了损伤对混凝土材料性能的影响,从而更接近混凝土材料的真实特性,并便于工程应用。 本文首先概述了混凝土的发展历程,总结和给出了高性能混凝土概念,指出研究适用于组合结构的高强高性能混凝土的意义;结合国内外关于高强高性能混凝土的研究动态,分析现有研究成果,总结高强高性能混凝土需进一步研究的问题;分析高强高性能混凝土对各组成材料的特殊要求,结合高强高性能混凝土与型钢的粘结作用机理,对高强高性能混凝土的原材料进行深入细致的选择和分析,用材料学微细观理论对混凝土材料的成型机理做了分析;以试验为基础,结合统计理论相关更多还原

【Abstract】 Compared with reinforced concrete structure and steel structure, steel reinforced concrete structure has superior mechanical behaviour and good comprehensive benefit. It has alreadly become important development direction of structure system in this century, and will be applied more and more in public building and the bridge structure, etc. Various performance of composite structures is decided by performance of steel and concrete, so it is of great significance to seek for the high strength and high performance concrete (HSHPC) to replace normal concrete in steel reinforced concrete composite structure to guarantee two kinds of the material work better together, by which fulfilling sustainable development of composite structures.Up till now, the research of HSHPC was maked by many scholars in the world, but their common characteristics are all to aim at one or several components of concrete. Because concrete is a sort of compound material, the properties of each component and their interaction should be considered. By analysis of microscopic action mechanism and the change of microstructure, HSHPC applied to composite structures can be developed. Related to constitutive relationship for concrete, many models were put forward and they are of great difference. They maybe adapt to normal concrete but uncertain to HSHPC, so the constitutive relationship of HSHPC applied to composite structures should be researched.The paper takes HSHPC applied to steel reinforced concrete (SRC) composite structures as research object. The current domestic and overseas researches were reviewed, and the property of each component of concrete was analysed by theory of material microstructure and preliminary selection for raw material was made. The experiment was made to discuss the influence of the material performance of different composition ratio orprocessing parameters. As a result, the best combination condition and the best-mixed proportion were obtained. In the light of damage mechanics and statistics knowledge, the material failure mechanism was analyzed, and the damage constitutive relationships as well as corresponding parameters of HSHPC were concluded. Material coefficient was got from the experiment and verification was made. In the constitutive relationships, the influence of damage on concrete material characteristic was considered, so they approach to the true characteristic of HSHPC, and is convenient to engineering application.First, the development process of the concrete was reviewed simply;the high performance concrete conception was given;the significance for this research was pointed out;the domestic and overseas related research results were retrospected, and the studied problems were brought forward. Then, the special requests to different components of concrete were discussed, and each component was conscientiously chosen;the forming mechanism was analyzed by microscopic theories. Based on experiment, the main factors that affect the performance of concrete, such as the different material category, different composition ratio, etc. were discussed. So the best raw material combination and the best match ratio were found. Finally, the damage constitutive relationships as well as corresponding parameters of HSHPC were concluded by means of analyzing microscopic action mechanism and using damage theories.The research results will avail the development of composite structures and provide the technique guidance and the theory supports for HSHPC applied to composite structures. It will make more engineers understand and master the action mechanism of concrete material. The results can be applied directly to practical projects and will contribute to establish corresponding structural code.更多还原