It is assumed in the numerical analysis of this study that the MEH devices are installed on the target slabs at observation points No. 1 to 6, as shown earlier in Figure 3. Since the proposed MEH devices can be tuned very sensitively to a certain narrow frequency band of interest, it would be reasonable to assume that the devices harvested the energies from slab vibrations of a single mode. From the eigenvalue analysis (Section 2.4), each pier model’s modal frequencies and mode shapes have been provided. For the following numerical analysis, the slabs are assumed to harmonically vibrate with the modal frequency and mode shape of a specified mode, and the harvested powers are calculated using the equations given in Section 1.4 and taking the harmonic vibrations at the observation points of interest as input. The computation on conversion from FEM results to generated energy from the vibrational MEMS device, using Equations (1)–(4), is followed by expressing sinusoidal vibrational waveform as the relationship between displacement and time in accordance to relative vibration amplitude and frequency provided from FEM analysis at each node of interest.