基于多目标遗传算法钢箱连续梁桥静动力有限元模型修正

发布时间：2018-06-05 15:39

本文选题：钢箱连续梁桥 + 静动力荷载试验　；参考：《辽宁工程技术大学》2015年硕士论文

【摘要】：建立精确的桥梁有限元模型,可以使分析结果更加真实反映桥梁技术状况,因此,逐渐产生了有限元模型修正问题以及各种修正方法。本文主要以多目标遗传算法为核心,以静动力荷载试验为基础,对钢箱连续梁桥有限元模型进行修正。主要内容如下：(1)简要介绍了有限元模型修正技术的发展历史及遗传算法的基本概念,并系统研究了有限元模型修正过程中的相关理论及技术问题；(2)以钢箱简支梁为算例,分别利用零阶法和多目标遗传算法对算例有限元模型进行修正,结果发现,多目标遗传算法修正结果更加精确；(3)对钢箱连续梁桥进行静动力荷载试验,得到桥梁固有频率以及各工况下的挠度值、应变值,同时为修正过程提供真实值；(4)建立钢箱连续梁桥初始有限元模型,计算桥梁静动力特性,分析结果为模型修正初始值；(5)基于多目标遗传算法对钢箱连续梁桥静动力有限元模型进行修正。结果可知,目标参数误差百分比在5%以内,修正后模型符合桥梁静动力特性。
[Abstract]:The accurate finite element model of the bridge can make the analysis result reflect the bridge technical situation more truthfully. Therefore, the problem of the finite element model modification and various modification methods are gradually produced. In this paper, the finite element model of steel box continuous beam bridge is modified based on multi-objective genetic algorithm and static and dynamic load test. The main contents are as follows: (1) A brief introduction to the history of the development of finite element model correction technology and the basic concept of genetic algorithm, and a systematic study of the relevant theoretical and technical problems in the process of finite element model modification. The finite element model is modified by zero-order method and multi-objective genetic algorithm respectively. The results show that the modified result of multi-objective genetic algorithm is more accurate and dynamic load test of steel box continuous beam bridge is carried out. The natural frequency of the bridge, deflection value and strain value under various working conditions are obtained. At the same time, the real value is provided for the correction process. (4) the initial finite element model of steel box continuous beam bridge is established, and the static and dynamic characteristics of the bridge are calculated. The results are as follows: (1) based on multi-objective genetic algorithm, the static and dynamic finite element model of steel box continuous girder bridge is modified. The results show that the error percentage of the target parameters is less than 5%, and the modified model accords with the static and dynamic characteristics of the bridge.
【学位授予单位】：辽宁工程技术大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U441

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