Sensor-Based Damage Detection and Quantification in Bridges Under Traffic and Environmental Effects

交通和环境影响下桥梁基于传感器的损坏检测和量化

• 批准号: 0700558
• 负责人: Surot Thangjitham
• 金额: $ 10万
• 依托单位: Virginia Polytechnic Institute and State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2007
• 资助国家: 美国
• 起止时间: 2007-05-01 至 2012-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0700558&HistoricalAwards=false
• 关键词: Sensor; Based; Damage; Detection; Quantification

This project will develop a robust approach for damage identification (detection and quantification) of bridges exposed to environmental temperature and solar radiation variations and traffic loads. The approach will utilize the modal properties extracted from vibration response data with appropriate adjustments for thermal effects for damage identification. The traffic induced vibration data along with measurements on the moving loads will be used for the extraction of the modal parameters. For the validation of the proposed modal estimation approach, the field data collected on two concrete bridges in Hong Kong will be utilized. For damage identification, the methods based on the improved estimation of the curvature flexibility will be developed. A comprehensive study will be conducted to evaluate the effect of thermal conduction on the modal parameters to propose simple methods utilizing only the yearly and diurnal temperature trends and spot measurements of the temperature at the time of data recording to calculate the temperature affected modal parameters. For damage quantification, the flexibility characteristics of damaged structure will be compared with those of the undamaged baseline structure adjusted to reflect the effect of the temperature environment at the time of the data measurements.

该项目将开发一种可靠的方法，用于暴露在环境温度、太阳辐射变化和交通荷载下的桥梁损伤识别（检测和量化）。该方法将利用从振动响应数据中提取的模态特性，并对热效应进行适当的调整，以进行损伤识别。交通诱发振动数据以及对移动荷载的测量将用于模态参数的提取。为了验证所提出的模态估计方法，将使用在香港两座混凝土桥梁上收集的现场数据。在损伤识别方面，将发展基于曲率柔度改进估计的方法。将进行全面的研究，以评估热传导对模态参数的影响，并提出简单的方法，仅利用年和日温度趋势和现场测量的温度在数据记录时计算温度影响的模态参数。对于损伤量化，将受损结构的柔韧性特征与未受损基线结构的柔韧性特征进行比较，以反映数据测量时温度环境的影响。