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基于磁弹效应的电磁弹式钢索(束)应力 监测系统

发表时间:2019-10-31  浏览量:108  下载量:6
全部作者: 段元锋,胡孝阳,段元昌,李娜
作者单位: 浙江大学建筑工程学院;杭州健而控科技有限公司;中交公路规划设计院有限公司
摘 要: 钢索(束)是索承桥梁和预应力结构的重要承重构件,因此施工及运营阶段的钢索(束)应力监控对确保结构安全极其重要。研究基于磁弹效应和智能磁电材料,提出和研发了电磁弹式(elasto-magneto-electric,EME)应力传感器和电磁弹仪,用于钢索(束)长期、无损、高精度应力监测。从EME应力传感器的原理出发,通过试验验证了该监测系统的测量精确性和稳定性。该系统已应用于多个桥梁的智能应力监测,包括椒江二桥斜拉索索力监测、泉州湾大桥体外预应力筋监测、台州高架桥体内预应力筋监测、四川饮马桥拱桥吊杆索力监测(后装哈弗式传感器)。长期研发和工程实践证明,所提出和研发的EME应力监测系统可以实现对钢索(束)的长期、无损、高精度(相对误差2%)应力监测。
关 键 词: 土木建筑结构;应力监测;磁弹效应;磁电材料;拉索;预应力筋
Title: Elasto-magnetic-electric (EME) stress monitoring system of steel cables (tendons) based on elasto-magnetic effect
Author: DUAN Yuanfeng, HU Xiaoyang, DUAN Yuanchang, LI Na
Organization: College of Civil Engineering and Architecture, Zhejiang University; Monitoring and Control Hangzhou Co. Ltd.; CCCC Highway Consultants Co. Ltd.
Abstract: Steel cables (tendons) are essential bearing component of cable-supported bridges and prestressed structures, that’s why the stress monitoring for steel cables (tendons) plays a significant role in structure safety during construction and operation phases. In this paper, based on elasto-magnetic effect and smart magneto-electric materials, an elasto-magneto-electric (EME) stress sensor and a magnetic demodulator are proposed and developed for long-term, non-destructive and high-precision stress monitoring of steel cables (tendons). Starting from the principle of EME stress sensors, the measuring accuracy and stability of the monitoring system are verified through experiments. The developed systems have been applied for intelligent stress monitoring for steel cables in the 2nd Jiaojiang bridge, external prestressed tendons in Quanzhou Bay bridge, internal prestressed tendons in Taizhou viaduct, hangers in Yinma bridge in Sichuan (using after-construction installing Harvard sensors). After long-term R&D and engineering, it has been proven that the EME stress monitoring system can realize long-term, non-destructive and high-precision stress monitoring of steel cables (tendons) with a relative error of less than 2%.
Key words: civil construction structure; stress monitoring; elasto-magnetic effect; magneto-electric materials; cables; prestressed tendons
发表期数: 2019年10月第5期
引用格式: 段元锋,胡孝阳,段元昌,等. 基于磁弹效应的电磁弹式钢索(束)应力 监测系统[J]. 中国科技论文在线精品论文,2019,12(5):761-768.
 
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