建筑中大面积金属构造物的工频磁场屏蔽效果

Experimental Investigation of Power-frequency Magnetic Shielding by Large Metallic Structure in Buildings

架空活动地板和金属装饰板在商用建筑物中常被采用,这种建筑物中的大面积金属构造物有一定的磁场屏蔽效果。笔者对这种大面积金属构造物,包括架空活动地板、金属装饰敷层,以及常用的铝板和镀锌铁皮板的工频磁场屏蔽性能进行了实验调查。分析了屏蔽材料、磁场源的方向性、屏蔽厚度,以及观测点距磁场源的距离等因素对屏蔽性能的影响。基于这些分析,对建筑物内大面积工频磁场屏蔽的设计和施工提出了建议。

Raised floors and metal decking is often adopted in high-rise commercial building. Power-frequency magnetic field shielding performance of these metal structures is of interest. Experimental investigation of the shielding properties of such metallic structure as well as large flat sheets used in buildings is carried out.The shielding performance impact of various parameters are clarified, such as the impact of shielding material, source orientation, shield thickness, as well as distance from the shield. These factors should be carefully looked at when magnetic shielding is in buildings.