DOI: 10.11908/j.issn.0253-374x.19094

作者:

作者单位: 1.同济大学 土木工程学院，上海 200092;2.上海临港经济发展(集团)有限公司 规划设计管理中心，上海 201306;3.同济大学 土木工程防灾国家重点实验室，上海 200092


作者简介: 夏 烨（1983—)，男，副研究员，硕士生导师，工学博士，主要研究方向为桥梁健康监测。E-mail: yxia@tongji.edu.cn


通讯作者: 孙利民（1963—)，男，教授，博士生导师，工学博士，主要研究方向为桥梁健康监测与振动控制。E-mail: lmsun@tongji.edu.cn

中图分类号: TU997


基金项目: 国家重点研发计划（2017YFC1500605）；国家自然科学基金（51978508）




Long-Term Monitoring and Performance Assessment for Concrete Beam Bridge Based on Neutral Axis Index
Author:

Affiliation: 1.College of Civil Engineering, Tongji University, Shanghai 200092, China;2.Planning and Design Management Center, Shanghai Lingang Economic Development (Group) Co., Ltd., Shanghai 201306, China;3.State Key Laboratory of Disaster Reduction in Civil Engineering, Tongji University, Shanghai 200092, China


Fund Project:




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摘要:提出基于中性轴的长期监测指标体系与性能评估方法。依托河北高速某分离式立交桥，建立基于监测指标的健康监测系统，并采集结构应变信息；采用多分辨率小波分析，从原始应变中分离由交通荷载引起的静态响应，根据设定的峰值显著程度拾取峰值-谷值对，拟合应变幅分布并导出实测中性轴参数序列；从累积数据中提取中性轴指标，比较分析不同评估周期的统计特性差异。结果表明，日周期下中性轴指标受环境干扰少，可表征结构在长期监测中的性能退化。



Abstract:A long-term monitoring index system based on neutral axis（NA) position and the corresponding performance assessment method were proposed. Based on a detachable viaduct in Hebei expressway, a health monitoring system based on monitoring indicators was established, and the structural strain information was collected. Static response caused by traffic loads was separated from original strain signals by the multi-resolution wavelet analysis. The peak-valley pairs were picked in accordance with the designated peak prominence. Then the strain amplitude distribution was fitted and the measured NA arrays were derived. Finally, the neutral axis index was extracted from the accumulated data, and the statistical characteristics of different evaluation periods were compared and analyzed. The results show that the proposed neutral axis index in daily periods is less disturbed by the environment, which can represent the performance degradation of the structure in the long-term monitoring.





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