Zhang Senhua, Zhou Jianting, Zhou Yi, Zhang Hong, Chen Jingwen
College of Civil Engineering, Chongqing Jiaotong University, Chongqing 400074, China.
Chongqing Yapai Bridge Engineering Quality Inspection Co., Ltd., Chongqing 401120, China.
Materials (Basel). 2019 Jul 10;12(14):2230. doi: 10.3390/ma12142230.
Cable tension monitoring is important to control the structural performance variation of cable-supported structures. Based on the elasto-magnetic effect and the self-induction phenomenon, a new non-destructive evaluation method was proposed for cable tension monitoring. The method was called the elasto-magnetic induction (EMI) method. By analyzing the working mechanism of the EMI method, a set of cable tension monitoring systems was presented. The primary coil and the induction unit of the traditional elasto-magnetic (EM) sensor were simplified into a self-induction coil. A numerical analysis was conducted to prove the validity of the EMI method. Experimental verification of the steel cable specimens was conducted to validate the feasibility of the EMI method. To process the tension monitoring, data processing and tension calculation methods were proposed. The results of the experimental verification indicated that different cables of the same batch can be calibrated by one proper equation. The results of the numerical analysis and the experimental verification demonstrated that the cable tension can be monitored both at the tension-applying stage and the tension-loss stage. The proposed EMI method and the given monitoring system are feasible to monitor the cable tension with high sensitivity, fast response, and easy installation.
索力监测对于控制索支撑结构的结构性能变化至关重要。基于电磁效应和自感应现象，提出了一种用于索力监测的新型无损评估方法。该方法被称为电磁感应（EMI）方法。通过分析EMI方法的工作机制，提出了一套索力监测系统。传统电磁（EM）传感器的初级线圈和感应单元被简化为一个自感应线圈。进行了数值分析以证明EMI方法的有效性。对钢索试件进行了实验验证，以验证EMI方法的可行性。为了处理张力监测，提出了数据处理和张力计算方法。实验验证结果表明，同一批次的不同索可以用一个合适的方程进行校准。数值分析和实验验证结果表明，在施加张力阶段和张力损失阶段都可以监测索力。所提出的EMI方法和给定的监测系统对于高灵敏度、快速响应且易于安装地监测索力是可行的。
