基于磁弹效应的电磁弹式钢索(束)应力监测系统
首发时间:2019-02-14
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。本文基于磁弹效应和智能磁电材料,提出和研发了电磁弹式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。从磁弹效应和监测系统的原理出发,通过试验验证了该监测系统的测量精确性和稳定性,并介绍了该监测系统实际工程应用,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,所提出和研发的电磁弹式应力监测系统,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: 桥梁与隧道工程 拉索 预应力筋 磁弹效应 磁电材料 应力监测
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EME Sensors for Total Stress Monitoring of Steel Cables and Prestressed Tendons
Abstract:Steel Cables (tendons) are essential bearing component of cable-supported bridges and prestressing structures, that\'s why the stress monitoring for cables and tendons plays an significant role in structure safety during construction and operation. In this paper, based on elasto-magnetic effect and smart magneto-electric materials, an elasto-magneto-electric(EME) sensor and a data regulating module are proposed and developed for long-term, non-destructive and high-precision stress monitoring of steel cables (tendons). Based on the principle of EME 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 prestressing tendons in Quanzhou Bay Bridge, internal prestressing tendons in Taizhou Viaduct, hangers in Yinma Bridge in Sichuan Province (using after-construction installed sensors). It has been proven that this EME stress monitoring system can realize long-term, non-destructive and high-precision stress monitoring of steel cables and tendons with a relative error of less than 2%.
Keywords: Bridge and tunnel engineering Bridge cables Prestressing tendons Elasto-magnetic(EM) effect Magneto-electric(ME) materials Stress Monitoring
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