建筑物内部电场强度分布特性数值模拟研究

为解决建筑物内部空间电场强度分布难以量化的问题，采用时域有限差分（FDTD）法，对以平面波为激励源，二阶Mur收边界条件的闭合规则建筑物、非规则加窗建筑物和含钢筋非规则加窗建筑物3种模型结构内部电场强度分布特性进行模拟，并通过FEKO软件对计算结果的有效性进行验证。结果表明：普通混凝土材质的建筑物对平面波电场几乎无屏蔽效能；吸波混凝土材质的建筑物对平面波电场的屏蔽效能也较为有限，且随激励源频率的增加，在建筑开窗区域附近的谐振性增强，屏蔽性减弱；通过对植入钢筋墙体建筑物采用细线FDTD法的场强分布计算，证明金属钢筋可提高建筑围护结构的屏蔽效能。

Numerical Simulation of Indoor Electric-field Strength Distributing Characteristics of Buildings

In order to solve the quantitative problem of the electricfield strength distribtion inside the building space, FDTD method is used to simulate the electricfield strength for three kinds of model structures, including closed and regular buildings, ir regular buildings with windows and irregular buildings of reinforced concrete with windows under plane wave and boundary condi tion of secondorder Mur. Simulation results are vertified by FEKO software. Studies show that ordinary concrete building has no shielding effectiveness for electricfield of plane wave; shielding effectiveness of absorbing concrete material building is more limit ed; frequent increase with the radiant source, resonance is enhanced close to window area and shielding effectiveness is lower. It tes tifies that reinforcement can improve the sheilding effectiveness of the building envelope, by calculating the distribution of electric field strength with thin wire FDTD method for wall of reinforced concrete.