基于多尺度分析的高压输电铁塔状态评估基础理论和方法研究

项目名称： 基于多尺度分析的高压输电铁塔状态评估基础理论和方法研究

项目编号： No.51278091

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 建筑科学

项目作者： 刘春城

作者单位： 东北电力大学

项目金额： 80万元

中文摘要： 高压输电铁塔结构复杂、杆件众多，在服役期内由于环境侵蚀、材料老化、疲劳荷载以及突发过载等因素作用下将导致构件以及连接节点的损伤积累和抗力衰减，容易发生极端条件下的动态倒塔破坏。在已有研究的基础上，提出多尺度和多场耦合作用下高压输电铁塔一致多尺度数值模拟、试验研究和分析方法，研究高压输电铁塔在极端环境荷载作用下结构的损伤破坏机理和失效模式；研究关键节点在多场耦合因素下长期动力响应衰减规律，揭示关键节点在复杂交变应力下的疲劳损伤机理，建立基于长期动力响应与多场耦合效应的累积损伤评估方法；基于多尺度分析考虑局部缺陷和损伤演变规律，利用先进信号处理技术并结合试验研究，建立高压输电铁塔的智能损伤识别方法；研究高压输电铁塔结构关键节点、构件层次和整体层次的安全评定理论与方法，建立服役期高压输电塔的状态评估理论模型。本项目的研究成果可为高压输电铁塔的设计、加固维修以及保证电网安全运行具有重要意义。

中文关键词： 多尺度分析；高压输电塔；状态评估；损伤识别；寿命预测

英文摘要： High-voltage transmission tower is complex structure with a considerable number of bars, in the service period, due to environmental erosion, material aging, fatigue loading, sudden overload and other factors, it will lead to damage accumulation and resistance decay of components and connection nodes, and it can be easily collapsed under extreme conditions. On the basis of existing research, the consistent multi-scale numerical simulation, experimental study and structural analysis methods of transmission towers by taking into account multi-scale as well as multi-physics field coupling are presented. The damage mechanism and failure mode of high-voltage transmission tower under extreme environmental loads are investigated. The long-term dynamic response attenuation law of key nodes on tower under multi-field coupling is studied in order to revealing fatigue damage mechanism in the complex alternating stress state, and the cumulative damage assessment method based on long-term dynamic response of multi-field coupling is conducted. Based on multi-scale analysis methodology with consider of local defects and damage evolution process, the advanced signal processing technology is applied to model experiment, and the smart damage identification method of high-voltage transmission tower is proposed. By studying the s

英文关键词： multi-scale analysis；high-voltage transmission tower；state assessment；damage identification；life prediction