摘要
为利用常规二轴过桥车辆振动响应间接识别桥梁损伤,提出了采用接触点响应残差的驱车频率成分构建瞬时振幅IAS指标,根据IAS指标局部突变特性定位和量化桥梁损伤.基于理论推导构建了二轴车通过简支梁的接触点响应残差驱车频率成分的IAS指标解析表达式,通过车桥耦合有限元仿真分析验证了IAS指标理论推导及用于损伤识别的准确性.研究表明,当车桥耦合效应可忽略时,接触点响应残差可以完全消除车体振动和路面粗糙度的影响,用于识别桥梁损伤.在考虑路面粗糙度情况下接触点残差也能准确识别桥梁多阶频率,所构建的IAS指标可以准确识别单点或多点损伤.
To indirectly identily bridge damage using the vibration responses of a regular two axle passing vehicle,the components of driving frequencies of the residual contact-point response were processed to establish the instantaneous amplitude square(lAS)indicator.This indicator was employed to localize and quantify bridge damags solely based on its local change features,The closed-form solution for the residual contact-point acceleration of a two axle vehicle passing through a simply beam was derived,and the lAS indicator was established using the com ponents of driving frequencies.A finite element simulation program of the vehicle-bridge interaction system was established to validate the theoretical derivation of the lAS indicator and its ability to detect damage,The results indicate that the residual contact-point response can completely eliminate the influence of vehicle vibration and road roughness,and is effective to detect damage when the coupling effect between the vehicle and the bridge can be ignored.'The residual contact-point response can accurately identily multiple bridge frequencies even when consider ing road roughness.The constructed lAS indicator can accurately identify single or multiple points of damage.
作者
程俭廷
林梓康
吴晓生
胡朝辉
周军勇
CHENG Jianting;LIN Zikang;WU Xiaosheng;HU Chaohui;ZHOU Junyong(Guangzhou Chengan Road&,Bridge Testing Co.Ltd.,Guangzhou 510420,China;School of Civil Engineering,Guangzhou University,Guangzhou 510006,China)
出处
《石家庄铁道大学学报（自然科学版）》
2024年第3期18-24,共7页
Journal of Shijiazhuang Tiedao University(Natural Science Edition)
基金
国家自然科学基金(52178280)
广州市市校联合资助项目(SL2023A03J00897)。
关键词
桥梁工程
间接测量
损伤识别
二轴车
接触点残余谱响应
bridge engineering
indirect measurement
damage identification
two-axle vehicle
residual contact-point response
