基于动态子结构法的异形桥梁动力特性研究

发布时间：2018-01-14 22:03

本文关键词：基于动态子结构法的异形桥梁动力特性研究　出处：《吉林大学》2014年硕士论文　论文类型：学位论文

【摘要】：国内经济的发展带动了城市建设的发展和交通事业的繁荣，异形桥的建设也在城市高架及立交枢纽中兴起，并对疏导交通起到很好的作用。然而对该类桥梁受力性能的研究仍处于滞后状态，至今仍未形成成熟有效的结构静动力特性计算方法。相对于结构的静力分析，结构动力特性分析需要耗费更多的计算机资源，对于大型复杂结构尤其如此。而结构振动分析的子结构法则为解决复杂结构的动力特性问题提供了一条有效途径。子结构法基于“化整为零”的基本思想，将结构按几何构造划分为若干子结构，，仅采用各个子结构的若干低阶动力特性，并结合界面协调条件即可得到结构整体的动力特性。这无疑缩减了计算存储量及计算时间，还容易查错，降低计算失败的可能。本文围绕动态子结构法在求解异形桥梁动力特性中的应用，主要开展了以下几个方面的工作： (1)总结了采用有限元法求解桥梁结构动力响应的基本步骤及方法，并详细介绍了求解结构动力特性的几类子结构方法的基本原理及求解方法。 (2)选取两类典型的异形桥梁模型为研究对象，即相对简单的异形梁桥模型和从实际工程中抽象出来的典型异形箱梁模型，首先利用MATLAB进行整体结构动力性能的传统有限元分析，并与ANSYS有限元模拟结果进行比对验证，确保其准确性；然后，计算结构在各种动态子结构算法下动力特性，以验证各种动态子结构法在异形桥梁动力分析中的可行性及精确度，并结合各类方法的求解精度和操作的复杂程度，对其在不同类型异形桥中的适用性进行探讨。 (3)设计过程往往是反复修正的过程，如果改变设计参数需要重新建立模型，势必增加设计复杂程度，为达到快速设计的目的，选取典型异形箱梁桥为研究对象，采用双协调的自由界面模态综合法来研究匝道半径、暗横梁刚度、各主梁截面形式等设计参数对结构整体动力性能的影响，以期为结构分析作参考。
[Abstract]:The development of the domestic economy has driven the development of city construction and transportation construction boom, special-shaped bridge also rises in the city viaduct and interchange, and a very good effect on traffic. However, the research on the force performance of the bridge is still lagging behind, has not formed a calculation method of static and dynamic characteristics the structure of mature and effective. Compared with the analysis of the structural static analysis, requires more computer resources structure dynamic characteristics, especially for large and complex structures. And the substructure method for structure vibration analysis provides an effective way to solve the problem of dynamic characteristics of complex structure. The substructure method based on the basic idea, will break up the whole into parts "according to the geometry structure is divided into several sub structure, the sub structure is only some low order dynamic characteristics, and the interface structure of the whole coordination condition can be obtained The dynamic characteristics of the body will undoubtedly reduce computation storage and computation time, and it is also easy to check errors and reduce the possibility of computation failure.
(1) summarized the basic steps and methods of solving the dynamic response of bridge structure by finite element method, and introduced the basic principles and solving methods of several substructure methods for solving structural dynamic characteristics in detail.
(2) selected the two typical model of special-shaped bridge as the research object, namely the special-shaped bridge model is relatively simple and typical special-shaped box from the practical engineering abstract the traditional beam model, finite element analysis using MATLAB for the dynamic behavior of the whole structure, and compare the result of finite element simulation and ANSYS verification, to ensure that the then, the calculation accuracy; structural dynamic substructure algorithm in various dynamic characteristics, to verify the dynamic substructure method in special-shaped bridge dynamic analysis of feasibility and accuracy, complexity and accuracy and operation solving method, and discusses its applicability in different types of special-shaped bridge.
(3) the design process is often repeated correction, if change the design parameters need to establish model, is bound to increase the design complexity, in order to achieve the purpose of rapid design, selection of typical special-shaped box girder bridge as the research object, using the free interface mode comprehensive coordination method to study double ramp radius, dark beam stiffness, impact the main beam form design parameters on the dynamic performance of the whole structure, in order to structural analysis for reference.

【学位授予单位】：吉林大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U441

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