广义局部信息熵在简支梁损伤识别中的应用

摘要

For seeking simple damage identification method of concrete bridge,based on comentropy basic theory,damage identification effect in reinforced concrete simply supported beam of index is verified with generalized local comentropy.Using finite element software Midas/civil to build reinforced concrete simply supported beam,and get dynamic property of simply supported beam after operation.The achieved first-or-der and second-order vibration mode data in analysis is used to make up generalized local comentropy dam-age index,which is used to research the effect of generalized local comentropy in simply supported beam single point and multi points damage location,quantifying damage and anti-noise property.The result shows that generalized local comentropy damage index is simple and efficient in identifying damage of simply sup-ported beam,with some anti-noise function.%为了探寻简便的混凝土桥梁损伤识别方法,基于信息熵基本理论,利用广义局部信息熵损伤指标,验证指标在钢筋混凝土简支梁中的损伤识别效果.采用有限元软件Midas/civil建立钢筋混凝土简支梁的数值模型,运行分析得到简支梁的动力特性,采用简支梁一阶和二阶振型数据构建广义局部信息熵损伤指标,分别研究广义局部信息熵在简支梁单点和多点损伤定位、损伤定量和抗噪性方面的效果.结果表明广义局部信息熵损伤指标在简支梁损伤识别中简易、高效,且具有一定的抗噪能力.