【作者】 袁琳；

【导师】 朱涵；

【作者基本信息】 天津大学 ， 结构工程， 2006， 硕士

【摘要】 橡胶集料混凝土又称为弹性混凝土,它是一种绿色的新型建筑材料。其研究刚刚起步,从国外和国内对于橡胶集料混凝土的研究来看,从未有过在橡胶微粒混凝土中加入钢筋用于结构的研究,本文首次对于内部加钢筋的橡胶集料混凝土能否用于建筑结构中进行了理论上的可行性研究。本文采纳现有的规范设计方法——用‘公式法’推导分析了橡胶集料钢筋混凝土梁的受弯力学性能,所得到结论是其比普通钢筋混凝土梁具有更高的承载力和一定的经济效益。混凝土抗压强度是现有钢筋混凝土设计方法中极为重要的参数。本文根据橡胶集料混凝土内部积蓄应变能大的特色,提出一个新的设计理念:抛开混凝土抗压强度,将应变能引入结构设计。用‘能量法’分析其梁受弯的力学性能,发现其正截面最大受弯承载力与其内部应变能参数有密切关系。由此建议尝试用应变能作为钢筋混凝土梁设计参数。并提出用基于能量法的设计原理会对钢筋混凝土梁裂缝分析可能有更好的相关性。本文所作的理论研究是依据橡胶细集料体积掺量为10%~15%的橡胶集料混凝土的一系列材性实验和一些现有的文献成果进行的。基于普通混凝土的理论基础,探讨了橡胶集料钢筋混凝土梁正截面受弯承载力的基本性能,并与C50及以下等级的普通混凝土进行了比较,同时给出在橡胶集料混凝土极限压应变取某一固定值时,相同条件下,橡胶集料钢筋混凝土梁与普通钢筋混凝土梁正截面受弯承载力的设计算例。本文在理论推导分析的同时,又借鉴已有实验,对普通混凝土梁和橡胶集料混凝土梁进行了非线性有限元分析,得出其在破坏过程中的裂缝开展情况和挠度大小,并与理论分析结果进行了比较分析。更多还原

【Abstract】 Crumb Rubber Concrete is also called elastic concrete. It is a new style construction material. This paper makes the first step on the possibility research of introducing the Crumb Rubber Concrete with reinforced bars in to structure engineering.Based on codes standard method—‘formula methed’, this paper presents a bending analysis of a reinforced beam made with CRC within the framework of controlled concrete beam theory. And the analysis result show that the reinforced beam made with CRC’s bearing capacity is higher than that made with plain concrete. Compressive strength is one of the most significant actors of concrete. While Crumb Rubber Concrete (CRC) shows a characteristic of being high in ductility, energy absorption and ultimate compressive failure strain. In comparison to controlled concrete, crumb rubber concrete (CRC) exhibits a higher value of strain energy. So this paper presents a new design conception: ignoring concrete’s compressive strength and introducing the strain energy into design method which is called‘energy method’. And the results show that the ultimate bearing capacity of beam has an intimate relationship with the strain energy.Based on a series of material experiments and some existing literature results, a reinforced CRC (R%=10%~15%) bending beam case study is performed with the ultimate compressive failure strain for CRC being taken 0.6%. This article presents a bending analysis of a reinforced beam made with CRC as well as controlled concrete of C-50 and under.This paper established a finite element model to help studying the beams bend bearing performance. Borrowing ideas from some experiment results, non-linearity finite element analysis was worked out to find reinforced concrete beams made with CRC and controlled concrete’s limit bearing capacity, beams fracture developing and its deflection. Some conclusions were compared with theoretical formula results.更多还原