【摘要】：溫度荷載是橋梁結(jié)構(gòu)分析中的重要荷載之一,其產(chǎn)生的溫度效應(yīng)對橋梁結(jié)構(gòu)具有顯著的影響,而溫度荷載產(chǎn)生的溫度效應(yīng)不僅跟橋梁結(jié)構(gòu)的剛度有關(guān),同時與橋梁的邊界條件也有重要的關(guān)系,因此在進(jìn)行橋梁結(jié)構(gòu)溫度效應(yīng)的模擬分析中,需要確定橋梁結(jié)構(gòu)的邊界條件參數(shù),從而建立溫度效應(yīng)分析的有效橋梁模型。論文提出了一種基于溫度效應(yīng)的橋梁結(jié)構(gòu)有限元模型邊界條件參數(shù)識別方法。通過分析橋梁結(jié)構(gòu)溫度效應(yīng)與其邊界條件參數(shù)的關(guān)系,建立橋梁結(jié)構(gòu)實測溫度效應(yīng)與有限元模型模擬的溫度效應(yīng)關(guān)于邊界條件參數(shù)的目標(biāo)函數(shù),最后通過非線性最小二乘算法對目標(biāo)函數(shù)進(jìn)行優(yōu)化,得到橋梁結(jié)構(gòu)有限元模型的邊界條件參數(shù),從而獲得橋梁結(jié)構(gòu)溫度效應(yīng)分析的有效模型。論文的主要研究工作如下:1.以梁式結(jié)構(gòu)為例,分析其截面面積、彈性模量、結(jié)構(gòu)長度、熱膨脹系數(shù)以及邊界條件對梁結(jié)構(gòu)溫度效應(yīng)的影響。另外,通過對不同溫度模式作用下的具有不同邊界條件的梁式結(jié)構(gòu)溫度效應(yīng)分析,揭示了邊界條件參數(shù)與溫度效應(yīng)的關(guān)系,并推導(dǎo)出了整體溫差變化下的具有線性和雙線性平動邊界條件的梁結(jié)構(gòu)溫度效應(yīng)的表達(dá)式,以及線性梯度溫度作用下的具有線性和雙線性轉(zhuǎn)動邊界條件的梁結(jié)構(gòu)溫度效應(yīng)的表達(dá)式。2.本文建立了基于溫度效應(yīng)的橋梁模型邊界條件參數(shù)識別的方法與步驟,并通過5個不同荷載狀況下具有不同邊界條件參數(shù)的梁結(jié)構(gòu)數(shù)值模擬例子,驗證該方法在恒載、活載以及溫度荷載作用下依然能夠有效識別梁結(jié)構(gòu)線性和雙線性邊界條件參數(shù)。3.根據(jù)設(shè)計圖紙,建立袁澤橋初始有限元模型,并利用實測的溫度、應(yīng)變數(shù)據(jù),采用基于溫度效應(yīng)橋梁模型邊界條件參數(shù)識別方法識別了袁澤橋有限元模型邊界條件參數(shù),優(yōu)化后的袁澤橋有限元模型模擬的溫度效應(yīng)與實測溫度效應(yīng)相對于初始有限元模型模擬的溫度效應(yīng)更加吻合。
[Abstract]:Temperature load is one of the important loads in bridge structure analysis. The temperature effect produced by temperature load has significant influence on bridge structure, and the temperature effect produced by temperature load is not only related to the stiffness of bridge structure. At the same time, there is an important relationship between the boundary condition and the bridge boundary condition. Therefore, in the simulation analysis of the temperature effect of the bridge structure, it is necessary to determine the boundary condition parameters of the bridge structure so as to establish an effective bridge model for the analysis of the temperature effect. In this paper, a method of boundary condition parameter identification for finite element model of bridge structure based on temperature effect is proposed. By analyzing the relationship between the temperature effect of the bridge structure and the parameters of its boundary conditions, the objective function of the measured temperature effect of the bridge structure and the temperature effect simulated by the finite element model with respect to the parameters of the boundary conditions is established. Finally, the nonlinear least squares algorithm is used to optimize the objective function, and the boundary condition parameters of the finite element model of bridge structure are obtained, thus the effective model of temperature effect analysis of bridge structure is obtained. The main research work of this paper is as follows: 1. Taking the beam structure as an example, the effects of cross section area, elastic modulus, structure length, thermal expansion coefficient and boundary conditions on the temperature effect of the beam structure are analyzed. In addition, by analyzing the temperature effects of beam structures with different boundary conditions under different temperature modes, the relationship between the parameters of boundary conditions and the temperature effects is revealed. The expression of temperature effect of beam structure with linear and bilinear translational boundary conditions under the variation of global temperature difference is derived. And the expression of the temperature effect of beam structure with linear and bilinear rotational boundary conditions under the action of linear gradient temperature. 2. In this paper, the method and steps of boundary condition parameter identification of bridge model based on temperature effect are established. Five numerical simulation examples of beam structure with different boundary condition parameters under different load conditions are used to verify that the method is under dead load. The linear and bilinear boundary condition parameters of beam structure can still be identified effectively under live load and temperature load. 3. According to the design drawings, the initial finite element model of Yuanze Bridge is established, and the boundary condition parameters of the finite element model of Yuanze Bridge are identified by using the measured temperature and strain data and using the identification method of boundary condition parameters based on the temperature effect-based bridge model. The temperature effect simulated by the optimized Yuan Zeqiao finite element model is more consistent with the measured temperature effect than the temperature effect simulated by the initial finite element model.
【學(xué)位授予單位】：合肥工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：U441

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