本文關(guān)鍵詞： 活性粉末混凝土 組合構(gòu)件 彎曲性能 收縮徐變 界面剪應(yīng)力　出處：《北京交通大學(xué)》2013年碩士論文　論文類型：學(xué)位論文

【摘要】：活性粉末混凝土RPC (Reactive Powder Concrete)是一種具有高強(qiáng)度、高韌性、高耐久性的超高性能混凝土材料,能有效地克服目前普通混凝土結(jié)構(gòu)中存在的問題。但由于RPC的基本配制和普通混凝土不同,造成了它對各組分及生產(chǎn)過程的要求較高,硅粉的摻入、高效減水劑和鋼纖維的使用以及較高的成型和養(yǎng)護(hù)條件,都提高了RPC的生產(chǎn)成本,故本文提出采用普通混凝土和RPC的組合構(gòu)件,即在受拉區(qū)使用活性粉末混凝土,在受壓區(qū)二次澆注普通混凝土,從而充分利用兩種材料的材料特性。 本文主要對組合構(gòu)件的彎曲受力性能進(jìn)行研究,對組合構(gòu)件在彎矩作用下的受力和變形性能進(jìn)行理論分析,得到二者共同工作以及最后破壞的全過程,根據(jù)組合構(gòu)件的應(yīng)力分布分析其抗裂性,推導(dǎo)組合構(gòu)件在彎矩作用下的開裂彎矩和正截面承載力,為組合構(gòu)件應(yīng)用于工程實(shí)踐提供相關(guān)的數(shù)據(jù)以供設(shè)計施工參考。 由于普通混凝土的受壓本構(gòu)關(guān)系和RPC的受拉本構(gòu)關(guān)系均采用非線性本構(gòu)關(guān)系,故本文采用ABAQUS軟件對組合構(gòu)件進(jìn)行建模分析,通過對模型計算分析得到構(gòu)件的正截面抗彎承載力、剛度和撓度等數(shù)據(jù),并與普通鋼筋混凝土梁的建模計算結(jié)果進(jìn)行對比。 由于二次澆注的普通混凝土和RPC之間會產(chǎn)生較大的收縮徐變差,本文通過模擬普通混凝土的收縮和前期徐變,利用力學(xué)原理和變形協(xié)調(diào)推導(dǎo)出普通混凝土的拉應(yīng)力以及活性粉末混凝土RPC中的拉壓應(yīng)力公式。 對于組合構(gòu)件,由于普通混凝土與RPC的結(jié)合面是受力的薄弱環(huán)節(jié),研究提高結(jié)合面的抗剪強(qiáng)度,確保結(jié)合面能有效傳力的方法,并推導(dǎo)計算界面剪應(yīng)力,分析二者連接界面是否會產(chǎn)生滑移,以解決普通混凝土和RPC共同工作問題。
[Abstract]:Reactive Powder reactive concrete (RPC) is a kind of super high performance concrete material with high strength, high toughness and high durability. It can effectively overcome the problems existing in ordinary concrete structures at present. However, because of the difference between the basic preparation of RPC and ordinary concrete, the higher requirements for each component and the production process, the incorporation of silica fume, The use of superplasticizer and steel fiber, as well as the high conditions of forming and curing, all increase the production cost of RPC. Therefore, this paper proposes to adopt the combination of ordinary concrete and RPC, that is, to use reactive powder concrete in tensile zone. The second pouring of ordinary concrete in the compression zone makes full use of the material properties of the two kinds of materials. In this paper, the bending behavior of composite members is studied, and the mechanical and deformation behaviors of composite members under the action of bending moment are analyzed theoretically, and the whole process of joint work and final failure of composite members is obtained. According to the stress distribution of composite members, the crack resistance of composite members is analyzed, and the cracking moment and normal section bearing capacity of composite members under the action of bending moment are deduced, which provides relevant data for the application of composite members in engineering practice to provide reference for design and construction. Because the compressive constitutive relation of ordinary concrete and the tensile constitutive relation of RPC are both nonlinear constitutive relations, the ABAQUS software is used to model and analyze the composite members in this paper. The data of flexural bearing capacity, stiffness and deflection of normal section are obtained by the model analysis, and the results are compared with those of ordinary reinforced concrete beams. Due to the large shrinkage and creep difference between the secondary pouring ordinary concrete and RPC, this paper simulates the shrinkage and early creep of ordinary concrete. The formula of tensile stress of ordinary concrete and tension-compression stress of reactive powder concrete (RPC) is derived by means of mechanical principle and deformation coordination. For composite members, because the joint plane between ordinary concrete and RPC is the weak link of the force, the method of improving the shear strength of the bonding plane to ensure the effective transfer of force on the joint surface is studied, and the interface shear stress is deduced and calculated. In order to solve the problem of common concrete and RPC, the paper analyzes whether the interface between them will slip.
【學(xué)位授予單位】：北京交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2013
【分類號】：TU375.1

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 張明波;閻貴平;閆光杰;安明U，

本文編號：1523763