基于多阶段分区域动力测试的桥梁结构损伤评估
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摘要
针对桥梁结构损伤评估时存在的传感器布置数目过多和测点最优化等问题,基于连续体位移协调条件和状态随机空间理论,通过引入子区域的概念,提出了多阶段分区域移动测试法,从而得到桥梁整体结构模态振型。建立了以模态柔度系数对角元素为损伤指标的诊断方法。分析结果表明:提出的多阶段分区域移动测试法,能以较少的设备条件获得完整的结构动态响应数据,方便快捷地实现桥梁的振动测试,并从仅有的输出移动测试数据中得到结构的模态柔度对角元素。算例表明:模态柔度系数能较好地反映结构损伤区域和程度。
To solve the problem of excessive number of sensors and to optimize the measuring points in damage assessment of bridge structures, a method of multi-stage subregion mobile test was presented based on the displacement coordination condition of continuum and state stochastic space theory. This method can be used to identify the mode shape of overall structure by sub-region.The diagnosis method based on modal flexibility coefficient for angle element as damage index is proposed. The analysis results show that the new approach can exactly and efficiently obtain complete structural dynamic response data with less equipment conditions, and gain more precise outcome.
To solve the problem of excessive number of sensors and to optimize the measuring points in damage assessment of bridge structures, a method of multi-stage subregion mobile test was presented based on the displacement coordination condition of continuum and state stochastic space theory. This method can be used to identify the mode shape of overall structure by sub-region.The diagnosis method based on modal flexibility coefficient for angle element as damage index is proposed. The analysis results show that the new approach can exactly and efficiently obtain complete structural dynamic response data with less equipment conditions, and gain more precise outcome.
引文
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[3]周云,蒋运忠,易伟建,等.基于模态柔度理论的结构损伤诊断试验研究[J].湖南大学学报:自然科学版,2015,42(5):36-45.Zhou Yun,Jiang Yun-zhong,Yi Wei-jian,et al.Experim-ental research on structural damage detection base on modal flexibility theory[J].Journal of Hunan University(Natural Sciences),2015,42(5):36-45.
[4]林贤坤,张令弥,郭勤涛,等.基于模态挠度法的预应力连续箱梁桥状态评估[J].土木工程学报,2010,43(10):83-90.Lin Xian-kun,Zhang Ling-mi,Guo Qin-tao,et al.Application of modal deflection method for condition assessment of prestressed concrete continuous boxgirder bridges[J].China Civil Engineering Journal,2010,43(10):83-90.
[5]林贤坤,覃柏英,张令弥,等.基于不中断交通运行模态分析的模态挠度法在桥梁状态评估中的应用[J].振动与冲击,2013,32(14):52-57.Lin Xian-kun,Qin Bo-ying,Zhang Ling-mi,et al.Application of modal deflection method in condition assessment of a bridge on operation modal analysis without interrupting traffic[J].Journal of Vibration and Shock,2013,32(14):52-57.
[6]邱飞力,张立民,张卫华.基于模态柔度矩阵的结构损伤识别[J].噪声与振动控制,2015,35(4):101-106.Qiu Fei-li,Zhang Li-ming,Zhang Wei-hua.Structure damage detection based on modal flexibility[J].Noise and Vibration Control,2015,35(4):101-106.
[7]曹晖,Michael I F.基于模态柔度曲率的损伤检测方法[J].工程力学,2006,23(4):33-38.Cao Hui,Michael I F.Nondestructive damage evaluation indicator based on modal flexibility curvature[J].Engineering Mechanics,2006,23(4):33-38.
[8]刘寒冰,焦峪波,程永春,等.基于模态曲率理论及神经网络的简支梁桥损伤识别[J].吉林大学学报:工学版,2011,41(4):963-967.Liu Han-bing,Jiao Yu-bo,Cheng Yong-chun,et al.Damage identification for simply supported beam bridge based on modal curvature theory and neuralnetwor[J].Journal of Jilin University(Engineering and Technology Edition),2011,41(4):963-967.
[9]赵云鹏,于天来,焦峪波,等.异形桥梁损伤识别方法及参数影响分析[J].吉林大学学报:工学版,2016,46(6):1858-1866.Zhao Yun-peng,Yu Tian-lai,Jiao Yu-bo,et al.Damage identification method and factor evalution for irregular-shaped bridge[J].Journal of Jilin University(Engineering and Technology Edition),2016,46(6):1858-1866.
[10]徐士代.环境激励下工程结构模态参数识别[D].南京:东南大学仪器科学与工程学院,2006.Xu Shi-dai.Applied investigation of the modal identification for engineering structures undergoing ambient excitation[D].Nanjing:College of Instrumental Science and Engineering,Southeast University,2006.
[11]Peeters B,Maeck J,De Roeck G.Vibration based damage detection in civil engineering:excitation sources and temperature effects[J].Smart Materials and Structures,2001,10(3):518-527.
[12]Lopez-Aenlle M,Brincker R,Pelayo F,et al.On exact and approximated formulations for scaling mode shapes in operational modal analysis by mass and stiffness change[J].Journal of Sound and Vibration,2012,331(3):622-637.