基于温度效应的桥梁模型边界条件参数确定
发布时间：2019-03-11 11:31
【摘要】：温度荷载是桥梁结构分析中的重要荷载之一,其产生的温度效应对桥梁结构具有显著的影响,而温度荷载产生的温度效应不仅跟桥梁结构的刚度有关,同时与桥梁的边界条件也有重要的关系,因此在进行桥梁结构温度效应的模拟分析中,需要确定桥梁结构的边界条件参数,从而建立温度效应分析的有效桥梁模型。论文提出了一种基于温度效应的桥梁结构有限元模型边界条件参数识别方法。通过分析桥梁结构温度效应与其边界条件参数的关系,建立桥梁结构实测温度效应与有限元模型模拟的温度效应关于边界条件参数的目标函数,最后通过非线性最小二乘算法对目标函数进行优化,得到桥梁结构有限元模型的边界条件参数,从而获得桥梁结构温度效应分析的有效模型。论文的主要研究工作如下:1.以梁式结构为例,分析其截面面积、弹性模量、结构长度、热膨胀系数以及边界条件对梁结构温度效应的影响。另外,通过对不同温度模式作用下的具有不同边界条件的梁式结构温度效应分析,揭示了边界条件参数与温度效应的关系,并推导出了整体温差变化下的具有线性和双线性平动边界条件的梁结构温度效应的表达式,以及线性梯度温度作用下的具有线性和双线性转动边界条件的梁结构温度效应的表达式。2.本文建立了基于温度效应的桥梁模型边界条件参数识别的方法与步骤,并通过5个不同荷载状况下具有不同边界条件参数的梁结构数值模拟例子,验证该方法在恒载、活载以及温度荷载作用下依然能够有效识别梁结构线性和双线性边界条件参数。3.根据设计图纸,建立袁泽桥初始有限元模型,并利用实测的温度、应变数据,采用基于温度效应桥梁模型边界条件参数识别方法识别了袁泽桥有限元模型边界条件参数,优化后的袁泽桥有限元模型模拟的温度效应与实测温度效应相对于初始有限元模型模拟的温度效应更加吻合。
[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.
【学位授予单位】：合肥工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U441
[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.
【学位授予单位】：合肥工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U441
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