摘要
基于间接测量技术,采用国际标准化组织建议的功率谱密度函数(PSD)模拟路面粗糙度等实际因素在车桥耦合模型中的影响,提出一种通过检测车辆在桥梁上运行,并利用安装在检测车辆上的传感器所得的动力响应信号来识别梁弯曲刚度,进而进行结构损伤识别的间接测量新方法。考虑到应用该新方法过程中路面粗糙度等实际因素易产生不利影响,提出利用车频及车辆阻尼比相同的2辆检测车位移信号相减的方法来消除路面粗糙度产生的影响。首先通过理论推导对该方法进行理论验证,接着采用数值模拟的方法分别对采用该方法消除路面粗糙度影响的可行性、桥梁损伤位置识别的可行性以及损伤程度识别的可行性进行验证,最后采用该方法进行实桥实测试验。研究结果表明:所提方法可以有效消除路面粗糙度等实际因素对间接测量技术的不利影响,可以有效地识别梁弯曲刚度,进而达到桥梁损伤识别的目的,有助于推动基于动力测试的间接测量技术在桥梁结构损伤识别工作中的实际应用。
Based on an indirect measurement technique, the power spectral density as suggested by the International Organization for Standardization was used to simulate the influence of road surface roughness on the vehicle-bridge coupling model. A novel method of indirect measurement for structural damage identification is proposed;the bending stiffness of a beam can be identified using the dynamic response signal obtained from sensors installed on test vehicles when the vehicles move over a bridge. Because of the adverse effects of road surface roughness and other practical factors on the application of this method, the displacement signals of two test vehicles with the same frequency and damping ratio are subtracted for reducing the effect of road surface roughness in the subsequent condition assessment results. In this research, the method was verified by theoretical derivation, and then, the feasibility of reducing road surface roughness and identifying the bridge damage location and damage degree was verified by a numerical simulation. Finally, a bridge was evaluated using this method. The results show that this method can reduce the adverse effects of road surface roughness and other practical factors on the indirect measurement technique. The bending stiffness of the beam can be effectively identified for structural damage identification. This result is significant for promoting the practical application of damage identification of bridge structures based on indirect measurement technology using dynamic testing.
作者
阳洋
项超
蒋明真
李卫东
况杨
YANG Yang;XIANG Chao;JIANG Ming-zhen;LI Wei-dong;KUANG Yang(Key Laboratory of New Technology for Construction of Cities in Mountain Area,Ministry of Education,Chongqing University,Chongqing 400030,China;School of Civil Engineering,Chongqing University,Chongqing 400030,China;Chongqing Fuling District Traffic Committee,Chongqing 408000,China)
出处
《中国公路学报》
EI
CAS
CSCD
北大核心
2019年第1期99-106,126,共9页
China Journal of Highway and Transport
基金
国家自然科学基金项目(51778090)
中央高校基本科研业务费专项资金项目(2018CDQYTM0044)
涪陵区科技计划项目(FLKJ 2018BBA3038)
关键词
桥梁工程
间接测量技术
车桥耦合模型
损伤识别
弯曲刚度
路面粗糙度
bridge engineering
indirect measurement technique
vehicle-bridge coupled model
damage identification
bending stiffness
road surface roughness
