Analytical Investigation of the Effects of HF2V Damping Devices on the Seismic Performance of the SAC LA3 Building

In this paper, the seismic performance of a 3 storey seismic frame with rigid moment connections at the beam ends (commonly known as the SAC LA3 building) is compared with that of the same frame using semi-rigid connections with high force to volume (HF2V) lead dissipators. The presence of the gravity frames in the model is also considered. It was found that the use of semi-rigid connections with HF2V dissipators, ignoring the effect of the gravity frames, caused a 12% increase in period of the frame due to the decreased stiffness of the connections. Accelerations were slightly lower and there was up to an 80% increase in peak drift, and a 200% increase in the permanent displacement compared to the as-designed case, but no structural damage was expected. When gravity frames were considered, the floor accelerations decreased further, the peak displacements do not significantly change, but the residual storey drift ratios reduced to approximately 0.17%. This result is less than one half that of the as-designed frame, where typically gravity frame effects are not considered. The analyses show that combining HF2V lead dissipators with gravity frames and well-designed non-structural elements creates a system with almost no structural damage and low residual displacements

Analytical Investigation of the Effects of HF2V Damping Devices on the Seismic Performance of the SAC3 Building

In this paper, the seismic performance of the 3 storey seismic frame with rigid moment connections at the beam ends (commonly known as the SAC3 building) is compared with that of the same frame using semi-rigid connections with high force to volume (HF2V) lead dissipators. The presence of the gravity frames in the model is also considered. It was found that the placement of dissipators, ignoring the effect of the gravity frames, caused a 12% increase in period of the frame due to the decreased stiffness of the connections. During design level ground shaking the semi-rigid connections with HF2V dissipators have slightly lower accelerations, up to an 80% increase in peak drift, and a 200% increase in the permanent displacement compared to the as-designed case, but no structural damage is expected. When the gravity frames are considered, the floor accelerations decrease further, the peak displacements do not significantly change, but the residual storey dirft ratios reduce to approximately 0.17%. This result is less than one half that of the as-designed frame, where typically gravity frame effects are not considered. The analyses show that combining HF2V lead dissipators with gravity frames and well-designed non-structural elements creates a system with almost no structural damage and low residual displacements