A New Approach in Mass Isolation by Dividing and Isolating the Building’s Floors

One of the main reasons for severe damage to buildings in the earthquake is the creation of large drifts in the structural floors, due to the excitation of private modes of the building with a frequency relatively close to the vibrational frequency of the ground in the project site. Therefore, in order to prevent the creation of a special mode, measures should be considered that different frequencies in terms of vibration occur in different floors of the building. In the present paper, one of the subsets of seismic isolation systems called floor separation has been used to reduce seismic input energy and damage to the structure and the results of time history analyzes have been compared with the control structure. For this purpose, a three-story steel building with a flexural frame system with medium plasticity is considered as a control structure and the floor of the structural floors have been separated using the proposed method and directed to a suitable range by creating a suitable dynamic interaction mechanism for seismic responses. The studies show a significant effect of the use of this system on the performance of the structure. Studies show that by using this technique, while satisfying the performance of the structure in mild earthquakes, serious damage is prevented during strong earthquakes and the usability of the building is maintained and the consequences of earthquakes are minimized.

Keywords:

Floor Isolation , Passive Control , Time History Analysis , Seismic Response