【作者】 韩星星；

【导师】 王博； 徐建国；

【作者基本信息】 郑州大学 ， 岩土工程， 2009， 硕士

【摘要】 桥梁作为交通枢纽及生命线工程,是交通干线的重要组成部分,是国家和社会发展的重要基础设施。由于刚构—连续组合梁桥放松了多跨连续刚构桥对边主墩高度的要求,因此这种桥型适用于不同的地形、地质条件、通航要求,刚构—连续组合梁是连续梁和连续刚构的组合,它兼顾了两者的优点而扬弃各自的缺点,集连续刚构、连续梁优点于一身,具有整体性好,抗震能力强,结构受力合理,线形优美等特点,在结构受力、使用功能和适应环境等方面均具有一定的优越性,近十几年中在国内也得到了快速发展,并有加快发展的趋势。地震是一种破坏力巨大而又难以预测的自然灾害,由于其随机性和突发性,地震难以准确预测,往往导致灾难性后果,带来巨大的生命及财产损失,而我国是世界上的多地震国家之一,如何确保结构物在地震中的安全,始终是桥梁发展中的重要问题。传统的抗震方法通过加强结构自身抗力来抵抗地震作用,往往由于地震发生的不确定性,使得结构既不经济也不安全,近年来,基于结构振动控制理论的桥梁抗震技术已经受到各国学者的广泛重视,由于刚构—连续梁桥结构的复杂性,其振动控制方法的研究还处于起步阶段。因此,本文尝试利用主动变阻尼装置对一刚构—连续梁桥的地震震动进行控制,研究其控制效果及工程可行性,为工程应用提供参考。本文基于结构振动控制的理论,以一实际刚构—连续梁桥为背景,将主动变阻尼装置应用到桥梁的减震控制中,采用限界Hrovat最优半主动控制算法,利用Matlab软件仿真分析了三种地震波(EL-Centro波、Taft波、天津波)无控和半主动控制下的地震反应规律,分别讨论分析了相应的计算结果,对桥梁纵向施加一致地震激励下刚构—连续梁桥地震响应的减震效果进行研究,得出了主动变阻尼装置对刚构—连续梁桥的控制规律。(1)简介空间梁系有限元分析方法,阐述了利用空间梁单元建立结构有限元模型基本理论,然后利用空间梁单元建立了刚构—连续组合梁桥的空间动力分析模型,为抗震计算和减震研究提供分析对象,说明了结构动力分析地震波的选取和调幅规则和动力微分方程的求解方法;总结了结构振动控制的基本理论和方法。(2)主动变阻尼装置控制策略分析。基于LQR经典线性二次型最优控制算法,利用主动变阻尼装置对一实例进行振动控制,仿真分析了三种半主动控制策略和被动控制策略的减震效果。研究结果表明:在桥梁结构中附设主动变阻尼装置可有效控制结构在地震作用下的纵向振动;合理的半主动控制算法(限界Hrovat最优控制算法)可以起到较好的控制效果。(4)刚构—连续组合梁桥纵向无控、主动变阻尼装置半主动控制研究。通过在刚构—连续组合梁桥上安装主动变阻尼装置,采用限界Hrovat最优控制算法,利用Matlab软件研究其沿桥梁纵向输入三种地震波作用下桥梁无控和主动变阻尼装置的半主动控制效果,最后比较分析了控制前后的地震反应,研究结果表明:采用主动变阻尼装置对刚构—连续梁桥进行控制是可行的,有很好的控制效果。(5)研究了主动变阻尼装置在控制过程中控制算法的实现情况,并比较了半主动控制输出控制力与主动控制力的关系。研究结果表明:主动变阻尼装置很好的实现了本文采用的限界Hrovat最优算法;主动变阻尼装置的半主动控制力与主动控制力有很大差别,采用主动变阻尼装置对桥梁进行控制时只能尽可能接近主动控制力,而不能完全实现主动控制力。更多还原

【Abstract】 The bridge as the transport hub and the lifeline project and the main lines of communication important component, is national and the social development important basis facility.As Bridge of rigid frame-continuous girders reduced the* side main pillar high requirment with multi-span continuous rigid-framed bridge, therefore this kind of bridge is suitable for the different terrain, the geological condition and the navigation request. Bridge of rigid frame-continuous girders is the combination of continuous beam and continuous rigid frame,it has given consideration to both’s merit to develop the good and discarded the respective shortcomings and gathered the advantages of two structures,besides,it has also many characteristics,such as powerful strong seismic capacity, good integrality, reasonable structure stress,beautiful line shape,so it has many superiorities in the acclimatization, mechanical behavior of structure and application functions aspects,and so on. it has also obtained the fast development, and have the tendency. of speeding up the development in near several years.As a result of its randomness and burst characteristics,the earthquake often causes the disastrous consequence,and brings the huge life and the property damage, is a natural disaster which possesses great destructive power and forecasted with difficulty in advance.How to guarantee that the structure security in earthquake is important question throughout in the bridge development for our country, because the country is one of multi-earthquake countries in world.The traditional earthquake resistance methods by resisting the earthquake function through superstructure own resistance, often can make the structure not only uneconomical but also insecurely due to the uncertainty of earthquake .In recent years, the bridge earthquake resistance technology which is based on the structure vibration control theory already received various countries’ scholar widely to take seriously, As a result of the structure complexity for Bridge of rigid frame-continuous girders, its vibration control method’s research is also at the start stage.so this paper carried on the control to the bridge earthquake vibration with the active variable damper device,studied its control effect and the project feasibility for the reference of the project applicationThis paper which was taked an actual Bridge of rigid frame-continuous girders as the background, based on structure vibration control theory, applied the active variable damper in the vibration control for Rigid Frame-Continuous Girders under earthquake action.the control system is simulated during respectively inputting three earthquake waves—EL-Centro wave,Taft wave,Tianjin wave,and studied by the optimal bounding criterion semi-active control algorithms (Hrovat) with MATLAB.the earthquake response of Bridge of rigid frame-continuous girders are given out respectively without control devices and semi-active control.,the corresponding computed result is analyzed and discussed,the research of vibration absorbing effect of earthquake respond of Bridge of rigid frame-continuous girders is conducted,with uniform earthquake excitation which is imposed longitudinally, obtained the vibration control rule of active variable damper device to Bridge of rigid frame-continuous girders.1、At first,this paper introduces finite element method on spatial beam element and illustrates the base theory for establishing structure finite element model, earthquake wave selection and amplitude modulation rule and solving method of dynamic differential equation,then a model for spatial dynamic analysis of Bridge of rigid frame-continuous girders is presented in order to provide the analysis basis for seismic calculation and vibration reduction analysis.in addition, summarize the structure vibration control elementary theory and the method.2、Control-strategy analysis of active variable damper device.Based on classical linear optimal control algorithm (LQR), the control policy absorption of shock effect of semi-active control algorithm and passive strategy are analysed.The results calculated indicate that, that active variable damper as a semi-active control device on bridge can effectively control response of longitudinal vibration response; An excellent control effectiveness has been achieved for the control structure. The reasonable control algorithm (Hrovat)may have the good control effect.3、The research of Longitudinal free vibrations and semi-active control effect for Bridge of rigid frame-continuous girders. applied the active variable damper in the vibration control for Rigid Frame-Continuous Girders under earthquake action.the control system is simulated during respectively inputting three earthquake waves—EL-Centro wave,Taft wave,Tianjin wave,and studied by the optimal bounding criterion semi-active control algorithms (Hrovat) with MATLAB.The results of earthquake responses of pre and post control are comparatively analyzed. The findings indicated that the control for Bridge of rigid frame-continuous girders is feasible, an excellent control effectiveness has been achieved for the control structure.4、The situation which is realized to the control algorithm is studied about active variable damper in control,and control force between active control and semi-active are compared and analyzed.The results show that the device very good has realized the optimal algorithm(Hrovat); Two kind of control forces exist the very wide difference, the control using active variable damper device for Bridge of rigid frame-continuous girders can only as far as possible the close controlling force, but cannot realize the controlling force completely.更多还原