Innovative damper of a multistory building

Abstract

Existing systems for seismic insulation of buildings, as a rule, are performed using damping devices, without connections, etc. At the same time, dynamic efforts are still quite high. A very effective way to dynamically protect a multi-stored building is to hang a massive pendulum with a spring system. With the significant effectiveness of this method of reducing the dynamic forces and vibrations of a building, this method has several disadvantages. Instead of a dynamic damper in the form of a metal ball, which significantly reduces the useful volume of the building and increases the cost, the article proposed to hang up part of the building, which is itself a pendulum damper and at the same time increases the useful area. The design of the suspended part of the building can significantly reduce the amplitude of vibrations and dynamic forces on the supporting structures of the building when an earthquake is applied.

In such a constructive scheme an additional part consisting of one or several floors is suspended between the main parts of the building. The mass of the suspended part of the building is calculated. The effectiveness of the proposed method is shown on the example of a frame building consisting of two ten-story parts at the edges and apart suspended between them consisting of five floors in an earthquake of 9 points.

It is shown that the maximum horizontal deviation from the vertical in a building without additional suspended floors is twice as large as in a building with five suspended floors. The use of the hanging part of the building can reduce the dynamic efforts by half. The increase in the mass of the suspended part of the building leads to a decrease in the amplitude of the horizontal oscillations of the main parts. In buildings where a metal ball is used as a pendulum, an increase in the mass of the pendulum leads to an increase in the cost of the building and a decrease in the useful area. In the proposed building, the mass of the pendulum damper can be taken anywhere, which is selected by dynamic calculation. In addition, this pendulum is part of the building and, conversely, increases its usable area.