基于模态参量的预损伤钢筋混凝土梁损伤识别研究

项目名称： 基于模态参量的预损伤钢筋混凝土梁损伤识别研究

项目编号： No.51278235

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： 马琨

作者单位： 昆明理工大学

项目金额： 80万元

中文摘要： 项目以预置损伤的钢筋混凝土试验梁为研究对象，开展在动静态交变荷载作用下预损伤钢筋混凝土梁的损伤识别研究。采用数值模拟及实验研究方法，结合小波变换等理论，研究钢筋混凝土梁在不同损伤状况下频率、阻尼、模态振型、应变模态，曲率模态等模态参量的不同响应及参量间的耦合关系；研究不同载荷作用下钢筋混凝土梁力学性能衰变过程及损伤机理；探索和寻找具有高抗噪性、高灵敏性的钢筋混凝土梁结构损伤识别方法和评价指标；建立能够反映非线性钢筋混泥土梁结构损伤演化过程的数学模型及基于多参数融合可用于工程实际的钢筋混凝土桥梁结构损伤识别检测方法。项目研究将极大的丰富和完善结构损伤识别理论及实验检测方法体系。项目研究涉及振动理论、结构工程、检测技术、数值模拟，信号处理等多学科交叉领域。研究成果对我省乃至我国大量新建和在役钢筋混泥土桥梁结构检测、监测、耐久性分析、剩余寿命评估等均具有重要的理论学术意义和工程应用价值。

中文关键词： 模态识别；预损伤钢筋混凝土梁；模态振型；频率；小波变换

英文摘要： The damage identification research is based on the study of preset damage reinforced concrete test beams on the static and dynamic alternating loads. The different coupled response of modal parameters such as frequencey，damp，modal shapes，strain modal,corvature mode shapes studied by the wavelet transformation theory, numerical simulation and experimental research methods on the condition of preset damaged. In order to explore and identify the damage mechanism and capability decay process, to establish mathematic modal to show the damage the nonlinear damage evolution, the experiment under static and dynamic alternating loads of reinforced concrete test beams will be carried out. Detection methods evaluation indexes have high noise anti-noise and high sensitivity merged by multi-parameter for engineering practice will be realized。The research is related to theory of vibration, structural engineering, detection technology, numerical simulation, signal processing will enrich and improve the damage theory of contracture and experimental detection system. The conclusion is theoretical academic significance value of engineering application to the monitor, analysis, remaining life assess of new and in service reinforced concrete bridge structure examination

英文关键词： Mode identification；Pre- damaged reinforced concrete beam；Modal Shape；Frequency；Wavelet transform