钢结构承压变形板体磁法探测正演影响研究

Research on Forward Effect of Magnetic Detection forPressure Deformed Plates of Steel Structures

针对传统变形监测存在一定的局限性,且不易探测钢结构微小变形的问题,利用磁场强度与空间位置之间的关系,建立了磁法探测理论在钢结构变形监测中的优化模型,分析对影响磁场强度的主要因素,证明磁法探测可以发现模型的微小变化,且监测精度高;论述不同模型方位、不同的探测距离及挠度与对磁场强度的影响关系。研究结果表明,地磁场的方向、形体与磁场方向的夹角、探测距离与形体的距离等因素影响形体的磁场强度,承压变形板体朝北时,形体获得探测最大挠度,为不规则模型磁场实测提供测量方法依据。

In view of the limitations of traditional deformation monitoring,and it is not easy to detect the small deformation of steel structure,the optimization model of magnetic detection theory in steel structure deformation monitoring is established by using the relationship between magnetic field intensity and spatial position.The main factors influencing the magnetic field strength are analyzed from many aspects.It is proved that magnetic detection can detect the small changes of the model and the monitoring accuracy High.The influence of different model orientation,different detection distance and deflection on magnetic field strength is analyzed in detail.The results show that the direction of the geomagnetic field,the angle between the body and the direction of the magnetic field,and the distance between the detection distance and the body affect the magnetic field strength of the body.When the pressure deformation plate faces north,the maximum deflection of the body is obtained,which provides the measurement method basis for the irregular model magnetic field measurement.