山区高速公路连续梁桥智能磁流变阻尼器减震控制研究

【作者】 刘朝晖；

【导师】 李德建；

【作者基本信息】 中南大学 ， 桥梁与隧道工程， 2008， 硕士

【摘要】 预应力钢筋混凝土连续梁桥是山区高速公路上常见的一种桥型,作为山区与外界联系的交通枢纽和生命线工程,其抗震性能一直是工程界关注的焦点。5.12汶川大地震的灾难性后果表明,山区高速公路桥梁的抗震性能关系到灾区抗震抢险能否顺利开展和灾后重建能否顺利进行,其重要性不言而喻。本文以山区高速公路上一座预应力钢筋混凝土连续梁桥—七方桥为工程背景,在桥梁结构纵向地震反应控制和各种算法减震控制效果的比较等方面做了一些工作,主要包括以下几个方面:1.综述国内外结构振动控制现状,详细介绍结构振动控制的发展历史、基本概念、研究应用情况,特别是桥梁工程中振动控制的现状。比较各类控制方法的优缺点,阐述采用智能磁流变阻尼器的半主动减震控制的优越性。2.为了更精确更方便地模拟磁流变阻尼器在桥梁上的减震效果,必须建立或寻求一个能较好地反映磁流变阻尼器强非线性特性的力学模型。总结前人对磁流变阻尼器力学性能和基于实验提出的力学模型的研究,选择介绍了具有代表性的Bingham模型、修正的Bingham模型、Bouc-Wen模型、现象模型,并用SIMULINK对Bingham模型进行了仿真分析,为合理选取本文采用的模型提供依据。3.对于超长联连续梁桥的地震反应,基于一致地面激励建立经典的运动方程已不再适用。本文建立并推导了地震动多点输入下的桥梁结构半主动控制系统运动方程,通过引入状态向量,推导了控制系统的状态方程。与此同时,讨论了质量矩阵、阻尼矩阵和刚度矩阵的选取,地震动的输入;介绍了结构主动最优控制算法以及磁流变半主动控制算法。为后续工作奠定理论基础。4.为探讨高速公路桥梁地震反应智能磁流变控制效果,将无控与被动控制(passive-off控制及passive-on控制)、智能磁流变半主动控制、主动控制的减震控制效果进行对比分析,得出智能磁流变半主动控制的特点和优越性。更多还原

【Abstract】 Prestressed reinforced concrete (PC) continuous beam bridge is a common type in expressway in the mountain area. As the transport junction and crucial engineering between the mountain area and the outside, its aseismatic capability attracts the engineers’ attention all the time. The disastrous consequences of Wen Chuan earthquakes on 5.12 showed that the aseismatic capability of expressway bridge in mountain area affects whether the rescue work in the disaster area can carry out smoothly and whether the reconstruction can proceed successfully after earthquake, the importance is self-evident. Based on the case of a PC continuous beam bridge, Qi Fang Bridge, this paper analyzed the seismic response control on the bridge structure lengthways and compared the efforts of various algorithms, and etc, including mainly the follows:1. This paper summarized the status quo of vibration control at home and abroad, introduced detailedly its development history, basic notions, the ways of researching and applying in the structure vibration control, especially in bridge engineering. The superiority of the control performance of intelligent Magnetorheological(MR) damper was expounded by means of comparing the merits and demerits of various methods in vibration control.2. In order to simulate the damping effect more accurately and conveniently in bridges with MR dampers, the mechanical model must be sought or established, which can reflect the strongly non-liner characteristic better. After generalized the predecessors’ study on the mechanical property and mechanical model of MR damper based on the experiments, introduced a set of representative models such as Bingham model, revised Bingham model, Bouc-Wen model and phenomenon model and simulated the Bingham model in SIMULINK, the basis of the reasonable selection of MR damper model is provided.3. As to the earthquake responses of the long span continuous beam bridges, the classic motion equation based on the identical ground motion, cannot be applied any more. This paper establishes and deduces the motion equation of the semi-active control system, which is subjected to seismic multi-support import, and deduces the state equation of the control system by introducing the state vector. At the same time, it discusses about the selection of mass matrix, damping matrix, stiffness matrix, the input of the seismic waves and introduces the optimal control algorithm method for the active structural control and of semi-active control of MR dampers, laying the theoretical foundation for the future study.4. By investigating control effort of the intelligent MR damper of the expressway bridge seismic response, comparing the damping control effort of uncontrolled strategy with the efforts of passive-off and passive-on control strategies, semi-active control and active control of intelligent MR damper, then analyzing them, we can obtain the characteristics and its superiority of semi-active control of the intelligent MR damper.更多还原