古建筑木结构模态参数识别和人致振动评估

发布时间：2018-03-18 11:28

本文选题：木结构　切入点：动力特性　出处：《北京交通大学》2017年硕士论文　论文类型：学位论文

【摘要】：中国的木结构古建筑有着极高的历史意义和艺术价值,很多结构年代代久远而且已经存在了比较严重的残损现象,而且目前国内外的许多针对古建筑的研究多是从建筑形制和静力性能着手,关于动力方面的研究较少。因此,关注古建筑的动力性能,进行古建筑的振动评估方面的研究工作有着重要的意义。本文的研究对象是以布达拉宫和故宫为代表的木结构古建筑,在进行现场动力实测的基础上,获得了结构的基本模态参数;此外,采集了长期人致结构振动的振动信号,在此基础上进行人致振动评估。主要包括以下几个方面的内容:首先,本文探究了木结构的自身结构特性,并对比分析了多种模态参数识别方法,探究一种适宜于古建筑木结构的参数识别方法,并用数值模拟来对该方法进行验证。其次,在故宫和布达拉宫进行了现场动力实测,在获取了现场实测数据的基础上,结合之前提出的模态参数识别方法,提取了结构的模态参数,并对该方法下模态参数识别的拟合优度进行了分析评估。最后,在获得了结构的动力参数的基础上,对结构在正常工作状态下的振动进行分析评估。以布达拉宫回廊为例,进行了长达两年的人致振动监测,提出了基于均方根值的信号剔除方法,并从理论分析,数值模拟,现场试验三个角度论证该方法的实用性,然后通过该方法对长期监测数据进行了过滤,对人致结构振动进行了分析评估。
[Abstract]:The ancient wooden structures in China are of great historical significance and artistic value. Many of them are old and have been badly damaged. And at present, many researches on ancient buildings at home and abroad begin from the shape and static performance of buildings, but there is little research on dynamic aspects. Therefore, the study of dynamic performance of ancient buildings is concerned. It is of great significance to study the vibration assessment of ancient buildings. The research object of this paper is the ancient wooden structures represented by Potala Palace and The Imperial Palace. The basic modal parameters of the structure are obtained. In addition, the vibration signals of the long-term man-made structure are collected, and the evaluation of the man-made vibration is carried out on this basis. The main contents are as follows: first, This paper probes into the structural characteristics of wood structure, compares and analyzes various modal parameter identification methods, explores a parameter identification method suitable for ancient building wood structure, and verifies the method by numerical simulation. Field dynamic measurements were carried out at The Imperial Palace and Potala Palace. On the basis of the field measured data, the modal parameters of the structure were extracted based on the modal parameter identification method previously proposed. Finally, on the basis of obtaining the dynamic parameters of the structure, the vibration of the structure under normal working condition is analyzed and evaluated. Taking the Potala Palace Corridor as an example, The method of signal elimination based on root mean square value (RMS) is put forward, and the practicability of the method is demonstrated from three aspects: theoretical analysis, numerical simulation and field test. Then the long-term monitoring data are filtered by this method, and the vibration of human-induced structures is analyzed and evaluated.
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU366.2;TU317

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