橡胶集料钢筋混凝土构件受弯性能初探
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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。
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.
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。
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.
引文
[1] Eldin, Neil N. & Senouci, A. B. Rubber-tired Particles as Concrete Aggregate [J], Journal of Materials in Civil Engineering. 1993, 5(4), 478 ~ 496.
[2] Savas, B.Z., Ahmad, S. and Fedroff, D. Freeze-Thaw Durability of Concrete with Ground Waste Tire Rubber [J]. Transportation Research Record. 1997,1574, 80~88.
[3] Hernandez-Olivares, F., Barluenga, G., Bollati, M. and Witoszek, B. Static and dynamic behavior of recycled tyre rubber-filled concrete.[J]. Cement and Concrete Research. 2002, 32 (10), 1587~1596.
[4] 宋少民,科娟红和金树新, 橡胶粉改性高韧性混凝土研究 [J].混凝土与水泥制品, 1997(1),11~12.
[5] Han Zhu(朱涵),Rubber Crumbs in Concrete,Concrete Technology Today[J],2003,135(8):30~33
[6]Zhu, H. Crumb Rubber Concrete, Rapra Handbook on Polymers Use in Construction, edited by Gune Ri AKOVLI , Rapra Technology, Shawbury,SY44NR, UK, 2004
[7] 朱传金.钢筋混凝土收缩裂缝机理分析与探讨.安徽建筑.2001,5
[8] 亢景付,金秋莲,彭小平,蒋晓鸥,粉煤灰活性矿物激发剂增强效果研究,天津建设科技,2004,14(1),33~-35.
[9] 中华人民共和国国家标准<硅酸盐水泥>GB175-1999[S],北京:建工出版社,2000
[10] Xiao, C. Engineering characterization and field evaluation for rubber concrete [D]. Arizona: Arizona State University, 2002.
[11] Ilker Bekir Topcu, The Properties of Rubber Concrete, Cement and Concrete Research, 304~310, 1995
[12] 中华人民共和国国家标准<混凝土结构实验方法标准>GB 50152-92,北京:建工出版社,1992。
[13] Han Zhu(朱涵) Adding Crumb Rubber into Exterior Wall Materials .Waste Management and Research [J]. 2003,20:407-413, EI: 02527289494 SCI: 622PY
[14] 程文瀼,康谷贻,颜德姮.混凝土结构.北京.中国建筑工业出版社,2001,28~42
[15] 江见鲸,钢筋混凝土结构非线性有限元分析,西安:陕西科学技术出版社,1994,125~132
[16] 董哲仁,钢筋混凝土非线性有限元法原理与应用,北京:中国铁道出版社,1993,87~95
[17] 严宗达,塑性力学,天津:天津大学出版社,1987,12~15
[18] W.F.Chen,余天庆等译,土木工程材料的本构方程(第二卷 塑性与建模),武汉:华中科技大学出版社,2001,55~63
[19] 沈聚敏,王传志,江见鲸,钢筋混凝土有限元分析与板壳极限分析,北京:清华大学出版社,1993,88~105
[20] 林浩华,混凝土夹心板(CS 板)抗剪性能的试验研究及板式结构体系分析[天津大学硕士学位论文],天津:天津大学,2004
[21] 吕西林,金国芳,吴晓涵,钢筋混凝土结构非线性有限元理论与应用,上海:同济大学出版社,1996,32~49
[22] 陆新征,江见鲸,用 ANSYS Solid65 单元分析混凝土组合构件的复杂应力,北京:建筑结构,2003-6,22~24
[23] 凌 广,吴同乐,贾永刚,钢筋混凝土有限元分析,成都:四川建筑,2003-10, 51~52
[24] A.F.Ashour, C.T.Morley, Three-dimensional nonlinear finite element modeling of reinforced concrete structures, Finite Elements in Analysis and Design, Vol.15, No.1, Dec 1993,P43~55
[2] Savas, B.Z., Ahmad, S. and Fedroff, D. Freeze-Thaw Durability of Concrete with Ground Waste Tire Rubber [J]. Transportation Research Record. 1997,1574, 80~88.
[3] Hernandez-Olivares, F., Barluenga, G., Bollati, M. and Witoszek, B. Static and dynamic behavior of recycled tyre rubber-filled concrete.[J]. Cement and Concrete Research. 2002, 32 (10), 1587~1596.
[4] 宋少民,科娟红和金树新, 橡胶粉改性高韧性混凝土研究 [J].混凝土与水泥制品, 1997(1),11~12.
[5] Han Zhu(朱涵),Rubber Crumbs in Concrete,Concrete Technology Today[J],2003,135(8):30~33
[6]Zhu, H. Crumb Rubber Concrete, Rapra Handbook on Polymers Use in Construction, edited by Gune Ri AKOVLI , Rapra Technology, Shawbury,SY44NR, UK, 2004
[7] 朱传金.钢筋混凝土收缩裂缝机理分析与探讨.安徽建筑.2001,5
[8] 亢景付,金秋莲,彭小平,蒋晓鸥,粉煤灰活性矿物激发剂增强效果研究,天津建设科技,2004,14(1),33~-35.
[9] 中华人民共和国国家标准<硅酸盐水泥>GB175-1999[S],北京:建工出版社,2000
[10] Xiao, C. Engineering characterization and field evaluation for rubber concrete [D]. Arizona: Arizona State University, 2002.
[11] Ilker Bekir Topcu, The Properties of Rubber Concrete, Cement and Concrete Research, 304~310, 1995
[12] 中华人民共和国国家标准<混凝土结构实验方法标准>GB 50152-92,北京:建工出版社,1992。
[13] Han Zhu(朱涵) Adding Crumb Rubber into Exterior Wall Materials .Waste Management and Research [J]. 2003,20:407-413, EI: 02527289494 SCI: 622PY
[14] 程文瀼,康谷贻,颜德姮.混凝土结构.北京.中国建筑工业出版社,2001,28~42
[15] 江见鲸,钢筋混凝土结构非线性有限元分析,西安:陕西科学技术出版社,1994,125~132
[16] 董哲仁,钢筋混凝土非线性有限元法原理与应用,北京:中国铁道出版社,1993,87~95
[17] 严宗达,塑性力学,天津:天津大学出版社,1987,12~15
[18] W.F.Chen,余天庆等译,土木工程材料的本构方程(第二卷 塑性与建模),武汉:华中科技大学出版社,2001,55~63
[19] 沈聚敏,王传志,江见鲸,钢筋混凝土有限元分析与板壳极限分析,北京:清华大学出版社,1993,88~105
[20] 林浩华,混凝土夹心板(CS 板)抗剪性能的试验研究及板式结构体系分析[天津大学硕士学位论文],天津:天津大学,2004
[21] 吕西林,金国芳,吴晓涵,钢筋混凝土结构非线性有限元理论与应用,上海:同济大学出版社,1996,32~49
[22] 陆新征,江见鲸,用 ANSYS Solid65 单元分析混凝土组合构件的复杂应力,北京:建筑结构,2003-6,22~24
[23] 凌 广,吴同乐,贾永刚,钢筋混凝土有限元分析,成都:四川建筑,2003-10, 51~52
[24] A.F.Ashour, C.T.Morley, Three-dimensional nonlinear finite element modeling of reinforced concrete structures, Finite Elements in Analysis and Design, Vol.15, No.1, Dec 1993,P43~55