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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吸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。
In order to solve the problem that it is difficult to quantify the electric field intensity distribution in the interior space of a building, the finite-difference time-domain (FDTD) method is applied to analyze the closed-rules buildings with plane wave as the excitation source and the second order Mur absorbing boundary condition, The internal electric field strength distribution characteristics of three kinds of model structures with reinforced irregular windows were simulated and the validity of the calculation results was verified by FEKO software. The results show that the ordinary concrete buildings have almost no shielding effectiveness on the plane wave electric field; the buildings with wave-absorbing concrete structures have a relatively limited shielding effectiveness on the plane wave electric field; and as the frequency of the excitation source increases, the resonance near the window opening of the building The strength enhancement and the shielding are weakened. By calculating the field strength distribution of the thin-wall FDTD method, the metal reinforcement can enhance the shielding effectiveness of the building envelope.