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至今尚未找到满意的理论来计算钢筋砼抗电磁辐射的屏蔽,本文提出了一种解决这个问题的方法,它基于电磁辐射波照射到砼和钢筋的功率按它们的波导纳之此进行分配。因此,屏蔽效能取决于两种介质各自的电、磁、介质性质,以及它们的横截面和波的频率。本方法应用了坡印亭定理、麦克斯韦方程和达朗伯方程,为了说明本方法计算了钢筋砼抗电磁脉冲和雷电辐射波的屏蔽效能。
So far, no satisfactory theory has been found to calculate the shield of the reinforced concrete against electromagnetic radiation. This paper presents a solution to this problem based on the distribution of the power radiated by the electromagnetic radiation waves to the concrete and steel bars according to their wave admittance. Therefore, the shielding effectiveness depends on the respective electrical, magnetic and dielectric properties of the two media, as well as their cross-section and the frequency of the wave. This method uses Poynting’s theorem, Maxwell’s equation and Darumber’s equation. In order to illustrate the method, the shielding effectiveness of reinforced concrete against electromagnetic pulse and lightning radiation wave is calculated.