项目名称： 基于桥梁应变影响线的车辆荷载自动识别理论与算法研究

项目编号： No.51508576

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 建筑科学

项目作者： 王宁波

作者单位： 中南大学

项目金额： 20万元

中文摘要： 根据桥梁动应变响应进行车辆荷载识别是与桥梁监测、状态评估、荷载统计相关联的热点问题，也是发展桥梁动态称重技术的重要理论基础。本项目开展基于桥梁应变影响线的车辆荷载自动识别理论与算法研究；采用由分段多项式和可调幅谐波组成的混合函数对动态标定测试的初始影响线进行拟合，分离并提取具有准静态特性的桥梁应变影响线；针对模糊原始信号提出基于小波变换的车轴信息自动识别方法，并与真实车轴信息进行匹配分析；在准静态影响线提取研究和车轴信息自动识别与匹配的基础上，从影响线选定、多车辆称重等方面进一步探索提升车辆荷载识别精度的理论与算法；建立基于面-面接触的车-桥耦合振动模型，研究桥梁类型、跨度、测点位置、路面不平度、行车速度等因素对车辆荷载识别的影响；采用数值模拟和现场试验验证准静态影响线提取和车辆荷载自动识别理论与算法。研究成果可为桥梁结构评估、桥梁设计与管理提供依据，具有良好的理论与工程应用价值。

中文关键词： 应变影响线；车辆荷载；自动识别；桥梁动态称重；理论与算法

英文摘要： The vehicle load identification based on the response of dynamic strain of bridge, which is an significant theoretical foundation of Bridge Weigh-In-Motion technology, has become an increasingly hot topic relevant to bridge health monitoring and testing, condition assessment and load statistics. This project focuses on vehicle load identification and algorithm investigation based on bridge strain influence line; A hybrid function, composed of sectioned polynomial and harmonics with adjusted amplitude, are employed to fit initial influence line for dynamic calibration test. The bridge strain influence line with quasi-static characteristic can be extracted. The axles information automatic identification method based on wavelet transform is proposed to focus on fuzzy initial signal. The obtained axles information can be used to match with the real axles information. Along the line of quasi-static characteristic influence line extraction and axles information automatic identification and matching, the theory and algorithm used to improve the precision of vehicle load identification are further explored from the viewpoint of choice of influence line, vehicle weigh for multi-vehicle, etc. The vehicle-bridge coupling vibration model is built based on surface to surface contact to investigate the effects on vehicle load identification from type of bridge, span, the location of testing, road surface roughness, speed of vehicle, etc. The theory and algorithm of quasi-static influence line extraction and vehicle load automatic identification are examined by numerical simulation and field test. The obtained results can be used for bridge health and safety assessment, bridge design and management. The theoretical and practical value is of importance.

英文关键词： strain influence line;vehicle load;automatic identification;Bridge Weigh-In-Motion;theory and algorithm