鋼纖維混凝土等效彈性模量的均勻化理論及計(jì)算
發(fā)布時(shí)間：2018-10-16 11:16
【摘要】：鋼纖維混凝土是一種性能優(yōu)良、運(yùn)用較廣的新型復(fù)合材料，鋼纖維混凝土抗拉、抗彎以及抗剪強(qiáng)度比普通混凝土強(qiáng)度高，前人對(duì)鋼纖維混凝土的力學(xué)性能進(jìn)行了廣泛的研究。彈性模量是鋼纖維混凝土的一項(xiàng)重要的力學(xué)性能，前人一般采用實(shí)驗(yàn)法或者理論計(jì)算法對(duì)鋼纖維混凝土彈性模量進(jìn)行研究，本文采用均勻化理論結(jié)合有限元分析研究二維亂向鋼纖維混凝土等效彈性模量。主要研究內(nèi)容及結(jié)論如下： （1）對(duì)鋼纖維的應(yīng)用與發(fā)展、鋼纖維在混凝土內(nèi)大體的分布情況、鋼纖維的基本特性以及鋼纖維混凝土的發(fā)展和應(yīng)用現(xiàn)狀、基本理論研究做了總結(jié)回顧。 （2）對(duì)均勻化理論以及將鋼纖維混凝土進(jìn)行均勻化處理做了詳細(xì)的介紹。 （3）建立3D單胞模型，將幾何模型導(dǎo)入HyperMesh，劃分網(wǎng)格、分配材料屬性、導(dǎo)出模型并導(dǎo)入ANSYS，編寫均勻化程序完成有限元模型后處理。 （4）研究鋼纖維混凝土內(nèi)鋼纖維的不同含量、不同長徑比、不同分布以及基體不同強(qiáng)度對(duì)等效彈性模量的影響，并將得到的數(shù)值與文獻(xiàn)值進(jìn)行對(duì)比。研究結(jié)果表明：鋼纖維含量的增加能提高材料的等效彈性模量、長徑比的改變對(duì)材料的等效彈性模量的影響不是很大、鋼纖維的分布能改變材料的彈性模量、基體強(qiáng)度的改變能改變材料的等效彈性模量、當(dāng)鋼纖維體積率低于1.2%時(shí)，等效彈性模量與現(xiàn)有研究成果基本吻合，可知利用均勻化理論研究二維亂向分布的鋼纖維混凝土彈性模量具有可行性。當(dāng)鋼纖維體積率超過1.2%時(shí)，，不適應(yīng)于運(yùn)用均勻化理論計(jì)算其等效彈性模量。 （5）現(xiàn)今廣泛運(yùn)用的層布式鋼纖維混凝土路面是由二維亂向鋼纖維混凝土組成，當(dāng)鋼纖維含量低于1.2%時(shí)，對(duì)于采用鋼纖維混凝土的剛性路面可用均勻化方法，將路面各層均勻化成為一個(gè)疊層板體系用以研究路面的受力性能。
[Abstract]:Steel fiber reinforced concrete (SFRC) is a new type of composite material with excellent properties and wide application. The tensile, flexural and shear strength of SFRC is higher than that of ordinary concrete. The mechanical properties of SFRC have been studied extensively. Elastic modulus is an important mechanical property of steel fiber reinforced concrete (SFRC). In this paper, the equivalent elastic modulus of two-dimensional steel-fiber reinforced concrete (SFRC) is studied by using homogenization theory and finite element analysis. The main contents and conclusions are as follows: (1) the application and development of steel fiber, the general distribution of steel fiber in concrete, the basic characteristics of steel fiber and the development and application of steel fiber concrete. The basic theoretical research is summarized and reviewed. (2) the homogenization theory and the homogenization of steel fiber reinforced concrete (SFRC) are introduced in detail. (3) the 3D unit cell model is established and the geometric model is introduced into HyperMesh, to mesh. Distribution of material properties, derivation of model and introduction of ANSYS, homogenization program to complete finite element model post-processing. (4) the different content and aspect ratio of steel fiber in steel fiber reinforced concrete are studied. The effects of different distributions and different strength of the matrix on the equivalent elastic modulus are compared with those obtained in the literature. The results show that the increase of steel fiber content can increase the equivalent elastic modulus of the material, and the change of aspect ratio has little effect on the equivalent elastic modulus of the material, and the distribution of steel fiber can change the elastic modulus of the material. The change of matrix strength can change the equivalent elastic modulus of the material. When the volume ratio of steel fiber is lower than 1.2%, the equivalent elastic modulus is basically consistent with the existing research results. It is shown that it is feasible to study the elastic modulus of steel fiber reinforced concrete (SFRC) with the theory of homogenization. When the volume ratio of steel fiber exceeds 1.2, it is not suitable to use homogenization theory to calculate its equivalent elastic modulus. (5) the widely used layered steel fiber reinforced concrete pavement is composed of two-dimensional disorderly steel-fiber concrete. When the steel fiber content is lower than 1.2, the uniform method can be used for the rigid pavement with steel fiber reinforced concrete, and each layer of the pavement can be homogenized into a laminated slab system to study the mechanical properties of the pavement.
【學(xué)位授予單位】：湘潭大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TU528.572
本文編號(hào)：2274187
[Abstract]:Steel fiber reinforced concrete (SFRC) is a new type of composite material with excellent properties and wide application. The tensile, flexural and shear strength of SFRC is higher than that of ordinary concrete. The mechanical properties of SFRC have been studied extensively. Elastic modulus is an important mechanical property of steel fiber reinforced concrete (SFRC). In this paper, the equivalent elastic modulus of two-dimensional steel-fiber reinforced concrete (SFRC) is studied by using homogenization theory and finite element analysis. The main contents and conclusions are as follows: (1) the application and development of steel fiber, the general distribution of steel fiber in concrete, the basic characteristics of steel fiber and the development and application of steel fiber concrete. The basic theoretical research is summarized and reviewed. (2) the homogenization theory and the homogenization of steel fiber reinforced concrete (SFRC) are introduced in detail. (3) the 3D unit cell model is established and the geometric model is introduced into HyperMesh, to mesh. Distribution of material properties, derivation of model and introduction of ANSYS, homogenization program to complete finite element model post-processing. (4) the different content and aspect ratio of steel fiber in steel fiber reinforced concrete are studied. The effects of different distributions and different strength of the matrix on the equivalent elastic modulus are compared with those obtained in the literature. The results show that the increase of steel fiber content can increase the equivalent elastic modulus of the material, and the change of aspect ratio has little effect on the equivalent elastic modulus of the material, and the distribution of steel fiber can change the elastic modulus of the material. The change of matrix strength can change the equivalent elastic modulus of the material. When the volume ratio of steel fiber is lower than 1.2%, the equivalent elastic modulus is basically consistent with the existing research results. It is shown that it is feasible to study the elastic modulus of steel fiber reinforced concrete (SFRC) with the theory of homogenization. When the volume ratio of steel fiber exceeds 1.2, it is not suitable to use homogenization theory to calculate its equivalent elastic modulus. (5) the widely used layered steel fiber reinforced concrete pavement is composed of two-dimensional disorderly steel-fiber concrete. When the steel fiber content is lower than 1.2, the uniform method can be used for the rigid pavement with steel fiber reinforced concrete, and each layer of the pavement can be homogenized into a laminated slab system to study the mechanical properties of the pavement.
【學(xué)位授予單位】：湘潭大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TU528.572
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