基于交通激励的古建筑木结构动力分析模型及应用研究

There are to key problems need to be solved,according to national standard GB / T50452 evaluation traffic excitation on ancient timber structure effects.One is need to establish reasonable dynamic analysis model. And the other is the standard set monitoring point at the top of columns, and the horizontal velocity test in field monitoring is difficult to achieve..The project will study the problems specifically of above-mentioned. Firstly, vibration testing will be carried out on the ancient timber buildings along the traffic line, using the wavelet packet energy variation method, the signal is decomposed into different frequency level, through the extraction of the level signal energy value composition characteristic parameter group, to structural damage identification.Through revising component and a mortise and tenon joint stiffness of the model, to achieve damage simulation in the process of structure analysis, and establish reasonable ancient timber structure analysis model;On the basis of this, according to the typical ancient timber structure of the main vibration model to determine the structure system of lateral displacement shape function. And assume that the horizontal movement of structural system under traffic excitation of is a simple harmonic motion.So,structural displacement mode is obtained. To establish the relationship of different height horizontal velocity, through easy monitoring point horizontal velocity conversion of the top pillar speed, solve the test difficulty according to the standard monitoring points.

依据国家标准GB/T50452评估交通激励对古建筑木结构的影响有两个关键问题需解决：一是采用计算法评估时需建立合理的结构动力分析模型；二是该标准规定监测点在顶层柱顶，而该点水平速度的测试在现场监测中难以实现。.本课题针对交通沿线典型古建筑木结构进行振动监测，利用小波包分解后频带能量变化方法，将信号分解到不同频带的水平上，通过提取各水平信号的能量值组成特征参数组，对结构损伤进行识别，通过不断修正模型中构件及榫卯连接的刚度，实现既有损伤在结构分析中的模拟，建立合理的古建筑木结构分析模型；在此基础上，依据典型古建筑木结构的主要模态确定结构体系的侧移形状函数，并假定结构体系在交通激励下的水平运动为简谐运动，得到结构的位移模式，建立不同高度处水平速度间的相关关系，将易监测点的水平速度换算为顶层柱顶的水平速度，解决标准规定监测点的测试困难。

本课题针对交通沿线典型古建筑木结构——聊城光岳楼为研究对象，进行了动力特性和动力反应测试，获取动力分析参数，并据此反演出梁柱榫卯连接的刚度，构建反应实际损伤的动力分析模型；依据典型的古建筑木结构的主要模态确定结构体系的侧移形状函数，建立不同高度处水平速度的相关关系，将易监测点的水平速度换算为顶层柱顶的水平速度，解决了国家标准（GB/T50452-2008）规定的监测点的测试困难；同时，针对古木结构的损伤定位提出了小波包能量曲率差损伤识别指标。此外，就交通振动作用下古建筑木结构的保护措施，提出一种新型的减振措施―“振源传导桩”隔振系统。