基于混杂系统理论的斜拉桥桥塔及主梁控制方法研究

发布时间：2018-05-13 10:18

本文选题：混杂系统 + MLD　；参考：《北京交通大学》2014年硕士论文

【摘要】：摘要：斜拉桥属柔性结构体系,在风或地震作用下,其动力响应对结构安全的影响非常重要,通常会采取相应的控制措施。目前,针对特大型桥梁控制问题,有很多理论研究和工程应用,但对于多灾害的协同防御还缺乏深入的研究。本文论题来自2011年交通运输建设重大科技专项“特大型桥梁防灾减灾与安全控制技术”,其中,课题“基于混杂系统的特大型桥梁防灾减灾理论研究”作为一种新的理论探索,将混杂系统理论应用于桥梁系统的控制当中,旨在为我国已建或将要建设的桥梁提供新的灾害理论分析和控制优化技术。本文以斜拉桥构件—桥塔和主梁作为主要研究对象,探索混杂系统理论的应用,为进一步研究桥梁系统的混杂控制打下基础。首先,在综述了结构振动控制以及混杂系统理论及应用现状的基础上,通过对混合逻辑动态模型(MLD)的相关介绍,探讨了结构的混杂特性,进行了结构混杂系统理论的适用性分析。其次,进行了施工状态下斜拉桥桥塔的风振MLD控制方法研究。建立桥塔模型,进行结构的自振特性分析及相关的动力响应分析,基于此设计控制方案,并根据MLD建模理论,进行桥塔-ATMD系统的MLD模型推导,最后,运用MATLAB软件编制程序进行数值模拟,分析桥塔的减振效果,并和传统的控制方法进行对比。再次,对地震荷载作用下成桥状态的桥塔及主梁进行了MLD控制方法研究。建立斜拉桥模型并对其进行自振特性分析,分别针对桥塔和主梁进行相应的动力响应分析,综合以上分析结果设计控制方案并进行桥塔-ATMD和主梁-VDTMD系统的MLD模型推导,然后运用MATLAB软件模拟分析减振效果,并和传统的控制方法进行对比。最后,对比分析结果,得出结论：MLD对施工状态的桥塔风振控制以及地震荷载作用下成桥状态的桥塔和主梁减振都有一定的效果,且效果相对较好,介于传统主动控制和被动控制之间,验证了其应用的有效性和适用性,为进一步的研究奠定了基础。
[Abstract]:Absrtact: cable-stayed bridge is a flexible structure system. Under the action of wind or earthquake, the dynamic response of cable-stayed bridge is very important to the safety of the structure, and the corresponding control measures are usually taken. At present, there are a lot of theoretical research and engineering applications for super large bridge control problems, but there is still a lack of in-depth research on cooperative prevention of multiple disasters. The topic of this paper comes from the important scientific and technological project of transportation construction in 2011, "Super large bridge disaster prevention and reduction and safety control technology", among which, the topic "the theoretical study of super large bridge disaster prevention and mitigation based on hybrid system" is a new theoretical exploration. The hybrid system theory is applied to the control of bridge system in order to provide new disaster theory analysis and control optimization technology for the bridges built or to be built in China. In this paper, the cable-stayed bridge members, the bridge tower and the main beam are taken as the main research objects, and the application of hybrid system theory is explored, which lays a foundation for further study on hybrid control of bridge system. Firstly, on the basis of summarizing the theory and application of structural vibration control and hybrid system, the hybrid characteristics of the structure are discussed by introducing the hybrid logic dynamic model (MLDs). The applicability of structural hybrid system theory is analyzed. Secondly, the wind vibration MLD control method of cable-stayed bridge tower under construction condition is studied. The bridge tower model is established, the natural vibration characteristic of the structure and the related dynamic response analysis are carried out. Based on this design control scheme, the MLD model of the bridge tower-ATMD system is deduced according to the MLD modeling theory. Finally, the model of the bridge tower-ATMD system is derived. The MATLAB software is used to program the numerical simulation to analyze the vibration reduction effect of the bridge tower, and to compare with the traditional control method. Thirdly, the MLD control method of bridge tower and main beam under seismic load is studied. The model of cable-stayed bridge is established and its natural vibration characteristic is analyzed. The corresponding dynamic response analysis is carried out for the tower and the main girder respectively. The control scheme is designed and the MLD model of the tower and main girder is derived by synthesizing the above analysis results. Then MATLAB software is used to simulate and analyze the damping effect, and compared with the traditional control method. Finally, by comparing and analyzing the results, we draw a conclusion that the wind vibration control of the bridge tower under the construction state and the vibration reduction of the bridge tower and the main girder under the earthquake load have certain effect, and the effect is relatively good. Between the traditional active control and passive control, the validity and applicability of the application are verified, which lays a foundation for further research.
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U448.27

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