移动载荷作用下梁响应及小波损伤检测

发布时间：2018-01-05 08:36

本文关键词：移动载荷作用下梁响应及小波损伤检测　出处：《太原科技大学》2014年硕士论文　论文类型：学位论文

【摘要】：随着桥梁结构被大范围应用于交通道路建设中，其为经济发展和人们生活便捷产生了巨大的推动作用。然而桥梁在建造、长久使用等过程中不可避免的会出结构损伤，这严重威胁桥梁的安全使用和人们的生命财产安全。为此本文结合移动载荷作用下梁响应及小波损伤检测思路进行了如下几个方面的研究工作： (1)利用梁结构在移动载荷作用下的速度响应作为“Gaussian-5”小波输入信号进行损伤识别研究，并利用“车辆-桥梁”动力学分析模型从理论角度分析讨论了该方法的可行性； (2)针对不能被简化为单轴载荷的工况，本文对多轴载荷作用下桥梁损伤识别方法进行了理论分析和数值模拟，研究了将多轴载荷作用下的挠度响应作为“Gaussian-4”小波输入信号进行损伤识别的可行性； (3)运用数值模拟方法对比分析本文所提两种损伤识别方法的优缺点，在此基础上讨论了各个参数对损伤识别结果的影响； (4)利用搭建实验平台模型几何、力学特征绘制BEAM188单元横截面，，在此基础上分别将测得的前五阶固有频率和一阶振型输入到Ansys高级优化分析模块进行损伤识别分析和有限元模型可靠性分析，为进一步的实验分析提供数值模拟依据。
[Abstract]:With the wide application of bridge structure in traffic road construction, it has played a huge role in promoting economic development and people's convenience. However, bridges are being built. Structural damage will inevitably occur in the process of long-term use. This is a serious threat to the safety of the bridge and the safety of people's life and property. Therefore, this paper combines the beam response and wavelet damage detection under moving load to carry out the following research work: 1) using the velocity response of beam structure under moving load as "Gaussian-5" wavelet input signal to study damage identification. The feasibility of the method is discussed theoretically by using the "vehicle-bridge" dynamic analysis model. 2) aiming at the condition which can not be simplified as uniaxial load, this paper makes theoretical analysis and numerical simulation of bridge damage identification method under multi-axial load. The feasibility of using the deflection response under multiaxial load as the input signal of "Gaussian-4" wavelet is studied. 3) the advantages and disadvantages of the two damage identification methods proposed in this paper are compared and analyzed by using the numerical simulation method, and the influence of each parameter on the damage identification results is discussed. (4) the cross section of BEAM188 element is drawn by using the geometry of the experimental platform model and the mechanical characteristics. On this basis, the first five natural frequencies and the first mode are input into the Ansys advanced optimization analysis module for damage identification and finite element model reliability analysis. It provides the basis of numerical simulation for further experimental analysis.
【学位授予单位】：太原科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U441.3;O174.2

【参考文献】