目 录
摘 要
ABSTRACT
第一章 桥梁结构损伤检测概论.....................................................................................1
§1.1 桥梁结构损伤实例回顾...................................................................................1
§1.2 桥梁结构损伤检测的目的及意义...................................................................4
§1.3 桥梁结构检测方法...........................................................................................6
§1.3.1 静态检测方法................................................................................................6
§1.3.2 动态检测方法................................................................................................8
§1.3.3 桥梁结构动态检测的主要问题..................................................................10
§1.4 桥梁结构检测常规仪器.................................................................................11
§1.5 国内外桥梁结构检测研究的现状与发展.....................................................15
§1.6 本论文的主要研究内容................................................................................18
第二章 桥梁结构模态参数识别法...............................................................................19
§2.1.结构的传递函数和频响函数.........................................................................19
§2.2 结构激振方法及选择.....................................................................................24
§2.2.1 脉冲锤击激振..............................................................................................24
§2.2.2 正弦稳态激振..............................................................................................27
§2.2.3 环境随机激振..............................................................................................27
§2.2.4 激振方法的选择..........................................................................................28
§2.3 单自由度结构体系的模态参数识别.............................................................28
§2.3.1 幅值法[9,14] ................................................................................................... 28
§2.3.2 分量法..........................................................................................................30
§2.3.4 导纳圆法......................................................................................................31
§2.4 多自由度结构体系的模态参数识别.............................................................34
§2.4.1.单模态 SISO 识别法 ...................................................................................34
§2.4.2 多模态 SISO 识别法 ...................................................................................36
§2.4.3 多模态 SIMO 识别法[1,32] ........................................................................... 46
§2.5 结构模态参数的时域识别法介绍[1,32] .......................................................... 47
第三章 基于频率平方变化比的桥梁结构损伤检测...................................................50
§3.1 理论分析.........................................................................................................50
§3.2 损伤判据.........................................................................................................52
§3.3 验伤步骤.........................................................................................................53
§3.4 有限元算例[34] ................................................................................................ 54
§3.4.1 单元①损伤 50%时的算例.........................................................................54
§3.4.2 单元①损伤 5%时的算例...........................................................................63