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吉林大学学报(工学版)&2010,&40(增刊)&222-0227&DOI:
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平行弦钢桁架应力与感应电动势随荷载的变化
陈耕野,王彦召,姚战卫
东北大学 资源与土木工程学院,沈阳 110004
为了探索钢桁架应力的电磁测试方法，对Q235A平行弦钢桁架杆件应力与感应电动势的关系进行了实验研究。将平面和圆弧面两种磁芯传感器分别置于12号工字型钢弦杆表面、竖腹杆翼缘表面和直径为25 mm的斜腹杆圆柱表面，使磁力线穿过杆件局部区域形成交变磁场，在测点处感应出电动势。施加荷载时，同时测量杆件电动势和应变数值。实验表明：在加载范围内，应力与感应电动势的变化规律一致。上弦杆、竖腹杆受压缩，电动势随压应力的增大而减小；下弦杆受拉伸，电动势随拉应力的增大而增加；斜腹杆受拉伸，负电动势代数值随拉应力的增大而增大。实验数据线性拟合结果与由应力使磁矩偏转原理分析得到的荷载和电动势关系相符合。
Stress?induction EMF changing with load for parallel?chord steel trusses
CHEN Geng-ye,WANG Yan-zhao,YAO Zhan-wei
College of Resource and Civil Engineering,Northeastern University|Shenyang 110004,China
In order to investigate the method of electromagnetic measurement of stress, an experimental research of the relation between stress and induction EMF (electromotive force) was performed for Q235A parallel?chord steel truss. Two types of magnetic core sensors, planar or arc, was put respectively in the surface of chord and vertical web member flange, I?shaped steel of 12#, or in the surface of diagonal in diameter 25 mm. The magnetic line of force was made to penetrate the partial area of member and EMF was induced at the point of measurement. When the load was acted on the truss, the data of induction EMF and strain were measured at the same time. The experiment indicates that the change law of stress and induction EMF hold unanimity, within the range of loading. With the compressive stress increasing, EMF of upper chord and vertical web member decreases. With the tensile stress increasing, EMF of bottom chord increases, and the algebraic value of negative EMF of diagonal rises. The experimental data?fitting result accords with the relation between load and EMF from the analysis of stress?magnetic moment deflection.
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高等学校博士学科点专项科研基金项目()
通讯作者: 陈耕野（1955-）,男,教授.研究方向:结构测试技术.E-mail:chengengye@mail.
作者简介: 陈耕野（1955-）,男,教授.研究方向:结构测试技术.E-mail:chengengye@mail.
作者Email: chengengye@mail.
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