静力模型修正与统计分析在混凝土梁桥评定中的应用
发布时间：2018-12-08 10:33
【摘要】：桥梁是道路交通网中的重要结构,也是各线路早日通车的关键,因此必须保证其在设计使用年限中安全运营。装配式混凝土梁桥在实际工程中应用广泛,然而随着时间的推移,由于受到各种各样的外部环境因素影响,其结构性能必将出现不同程度的下降,我们必须了解其工作状态,以便及时作出应对措施。荷载试验是工程师最常利用的手段,通过荷载试验所得结果,可以对桥梁的工作状态给出评价,同时也可以判断桥梁的安全承载能力与营运质量。本文提出了一种基于位移误差的静力参数识别算法,依托实桥成桥荷载试验,建立实桥有限元模型,构造实测挠度数据与模型计算值之间的位移误差向量。并基于观测自由度对静力平衡方程进行推导,构造迭代方程,通过位移误差的逐步减小,来获取单元刚度的修正量,完成实桥模型的修正。同时,在确定损伤单元与最需要修正的参数时,本文提出了一种基于多元统计分析理论的待识别单元选择的方法,计算各片梁挠度实测数据的相关系数对梁间横向联系进行分析,并将主成分分析应用于挠度计算值与实测值偏差的分析,给出了通过统计学的思想分析数据的步骤与物理意义,通过两种手段的结合,获取桥梁结构中的相关参数,并分析该桥的实际工作状态。有限元模型修正的目的是对参数进行识别与修正,修正后的模型可以更好地代表实桥模型,参数识别的结果可以为桥梁损伤部位的判别以及后续的修复工作给出指导。
[Abstract]:Bridge is an important structure in road traffic network, and it is also the key to the early opening of each line. Therefore, it is necessary to ensure the safe operation of the bridge in its design service life. Fabricated concrete beam bridges are widely used in practical projects. However, with the passage of time, due to the influence of various external environmental factors, the structural performance of fabricated concrete girder bridges is bound to decline in varying degrees, so we must understand its working state. In order to make timely response measures. Load test is the most common means used by engineers. Through the results of load test, the working state of the bridge can be evaluated, and the safe bearing capacity and operation quality of the bridge can also be judged. In this paper, a static parameter identification algorithm based on displacement error is proposed. The finite element model of the real bridge is established based on the load test of the real bridge, and the displacement error vector between the measured deflection data and the calculated value of the model is constructed. Based on the observation degree of freedom, the static equilibrium equation is deduced, and the iterative equation is constructed. Through the gradual reduction of the displacement error, the correction of the element stiffness is obtained and the real bridge model is modified. At the same time, when determining the damage element and the most needed parameters, this paper proposes a method of selecting the unit to be identified based on the theory of multivariate statistical analysis. The correlation coefficient of calculating the measured data of deflection of each beam is used to analyze the transverse relation between the beams, and the principal component analysis is applied to the analysis of the deviation between the calculated and measured values of deflection. The steps and physical significance of analyzing the data through the thought of statistics are given. Through the combination of the two methods, the relevant parameters of the bridge structure are obtained, and the actual working state of the bridge is analyzed. The purpose of the finite element model modification is to identify and modify the parameters. The modified model can better represent the real bridge model. The result of the parameter identification can provide guidance for the identification of the damaged site of the bridge and the subsequent repair work.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U446
本文编号：2368202
[Abstract]:Bridge is an important structure in road traffic network, and it is also the key to the early opening of each line. Therefore, it is necessary to ensure the safe operation of the bridge in its design service life. Fabricated concrete beam bridges are widely used in practical projects. However, with the passage of time, due to the influence of various external environmental factors, the structural performance of fabricated concrete girder bridges is bound to decline in varying degrees, so we must understand its working state. In order to make timely response measures. Load test is the most common means used by engineers. Through the results of load test, the working state of the bridge can be evaluated, and the safe bearing capacity and operation quality of the bridge can also be judged. In this paper, a static parameter identification algorithm based on displacement error is proposed. The finite element model of the real bridge is established based on the load test of the real bridge, and the displacement error vector between the measured deflection data and the calculated value of the model is constructed. Based on the observation degree of freedom, the static equilibrium equation is deduced, and the iterative equation is constructed. Through the gradual reduction of the displacement error, the correction of the element stiffness is obtained and the real bridge model is modified. At the same time, when determining the damage element and the most needed parameters, this paper proposes a method of selecting the unit to be identified based on the theory of multivariate statistical analysis. The correlation coefficient of calculating the measured data of deflection of each beam is used to analyze the transverse relation between the beams, and the principal component analysis is applied to the analysis of the deviation between the calculated and measured values of deflection. The steps and physical significance of analyzing the data through the thought of statistics are given. Through the combination of the two methods, the relevant parameters of the bridge structure are obtained, and the actual working state of the bridge is analyzed. The purpose of the finite element model modification is to identify and modify the parameters. The modified model can better represent the real bridge model. The result of the parameter identification can provide guidance for the identification of the damaged site of the bridge and the subsequent repair work.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U446
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，本文编号：2368202
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