本文選題：混凝土梁 + 受剪承載力�。� 參考：《華南理工大學(xué)》2015年碩士論文

【摘要】：鋼筋混凝土結(jié)構(gòu)受剪性能的研究已有百余年歷史,但由于其破壞形態(tài)復(fù)雜,影響因素眾多,對受剪機理的認識還存在不足,至今尚未找到一種合理的理論模型去很好地預(yù)測結(jié)構(gòu)的受剪性能。非線性有限元方法的快速發(fā)展為鋼筋混凝土結(jié)構(gòu)受剪性能的研究注入新的活力,在非線性有限元軟件計算中,采用不同的混凝土等材料的本構(gòu)模型計算結(jié)果往往不同,甚至有較大的差別�；诖�,本文研究的主要內(nèi)容有:(1)介紹幾種主要的受剪分析方法,如桁架理論、極限平衡理論、塑性理論、非線性有限元分析法等�；炷恋谋緲�(gòu)模型對鋼筋混凝土結(jié)構(gòu)的非線性分析的準確性有重大的影響,因此對已有的理論模型如彈性理論、非線性彈性理論、彈塑性理論、斷裂力學(xué)理論、損傷力學(xué)理論和內(nèi)時理論等做了介紹。(2)運用混凝土彈塑性模型和塑性損傷模型通過ABAQUS軟件建立兩個非線性有限元模型,分析鋼筋混凝土梁和預(yù)應(yīng)力混凝土梁的受剪性能,并與試驗數(shù)據(jù)進行比對,研究模型在抗剪分析方面的適用性和可靠性。結(jié)果表明,混凝土塑性損傷模型的計算結(jié)果不僅受剪承載力與試驗結(jié)果吻合,而且各根梁的破壞現(xiàn)象與實際試驗現(xiàn)象也吻合,變形分析則需要注意混凝土截面開裂后的剛度折減。(3)應(yīng)用顯示非線性動態(tài)分析,對在地震加速度荷載作用下的鋼筋混凝土梁和預(yù)應(yīng)力混凝土梁進行數(shù)值模擬,分析梁的受剪性能。結(jié)果顯示,在加速度荷載作用下,RC梁及PC梁的受剪承載力相對靜載作用有不同程度的提升;鋼筋混凝土梁在加速度荷載作用下的破壞形態(tài)與靜載相比基本相同,而預(yù)應(yīng)力混凝土梁在加速度荷載作用下的破壞形態(tài)與靜載作用相比,則有較大不同。
[Abstract]:The shear behavior of reinforced concrete structures has been studied for more than a hundred years. However, because of its complex damage morphology and many factors affecting the shear mechanism, there are still shortcomings in the understanding of shear mechanism. So far, a reasonable theoretical model has not been found to predict the shear performance of the structure well. The rapid development of the non linear finite element method is a reinforced concrete junction. In the nonlinear finite element software calculation, the calculation results of the constitutive models of different concrete and other materials are often different and even different. Based on this, the main contents of this paper are as follows: (1) several main shear analysis methods, such as truss theory and limit equilibrium theory, are introduced. Plastic theory, nonlinear finite element analysis, and so on. The constitutive model of concrete has a great influence on the accuracy of nonlinear analysis of reinforced concrete structures. Therefore, the existing theoretical models, such as elastic theory, nonlinear elastic theory, elastoplastic theory, fracture mechanics theory, damage mechanics theory and internal time theory, are introduced. (2) Two nonlinear finite element models are established by using the concrete elastoplastic model and plastic damage model through the ABAQUS software. The shear behavior of reinforced concrete beams and prestressed concrete beams is analyzed and compared with the experimental data. The applicability and dependability of the model are studied in the shear analysis. The results show that the plastic damage model of concrete is made. The calculation results are not only in accordance with the experimental results, but also in the failure of the root beams and the actual test phenomena. The deformation analysis needs to pay attention to the stiffness reduction after the cracking of the concrete section. (3) the application of nonlinear dynamic analysis is shown to the reinforced concrete beams and prestressed concrete under the loading of seismic acceleration. The beam is simulated and the shear behavior of the beam is analyzed. The results show that the shear bearing capacity of the RC beam and the PC beam is improved to some extent under the acceleration load. The failure mode of the reinforced concrete beam under the acceleration load is basically the same as the static load, while the prestressed concrete beam is subjected to the acceleration load. The failure mode is quite different from that of static loading.

【學(xué)位授予單位】：華南理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TU375

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本文編號：1864972