环境温度影响下基于振动模态柔度曲率的结构损伤监测方法  

Damage Identification Method Research under the Influence of Environmental Temperature Based on Structural Vibration Mode Flexibility Curvature

作　　者：黄江[1,2] 梁亚斌[3] 冯谦[1,2] 

机构地区：[1]中国地震局地震研究所(地震预警湖北省重点实验室),武汉市洪山侧路40号430071 [2]武汉地震工程研究院有限公司,武汉市洪山侧路40号430071 [3]大连理工大学建设工程学部,大连市凌工路2号116024

出　　处：《大地测量与地球动力学》2016年第12期1121-1125,共5页Journal of Geodesy and Geodynamics

基　　金：国家自然科学基金青年科学基金(51608493);国家自然科学基金创新研究群体科学基金(51121005)~~

摘　　要：提出一种基于振动模态柔度曲率指数和突变指数的损伤识别方法,利用温度在结构内部连续平缓的分布特性,通过对柔度曲率进行二阶差分求导消除环境温度变化对损伤识别结果的影响,并基于协整理论给出所提方法的物理解释。最后,结合一个简支梁算例验证所提方法的有效性,利用连续监测数据对上述指标多次统计平均处理来提高抗噪性。A novel detection approach using curvature index of modal flexibility curvature and its curvature damage diagnosis index is proposed in this paper.The proposed method is based on the unique character of temperature propagation and distribution in structure;the temperature disturbance can be eliminated by differentiating a second time for flexibility curvature.A physical interpretation is demonstrated for the proposed method based on cointegration theory.The validity and effectiveness of the proposed method are illustrated through a simple supported beam simulation,and a statistical averaging technique is utilized to improve the noise resistance of these damage indexes.Thus,the proposed method has the potential to be implemented in practical applications.

关 键 词：结构振动 模态柔度曲率 环境温度 结构健康监测 

分 类 号：P315[天文地球—地震学]