EARTHQUAKE-RESISTANT FRAMEWORK OF A HIGH-RISE BUILDING

Purpose. The purpose of this work is to consider the option of increasing the seismic resistance of the frame of a high-rise building by using an energy absorber in the tie nodes of the frame-tie scheme, which will reduce the transfer of dynamic loads from seismic vibrations to the frame nodes due to partial dispersion and reduction of the amplitude of these vibrations in "elder nodes". Methodology. Review of the main existing structural schemes of high-rise buildings and analysis of the advantages and disadvantages of the frame-elder scheme of a high-rise building, analysis of the effects of seismic vibrations on the nodes of the structural scheme of a high-rise building. Presentation of an option to increase the seismic resistance of the frame of a high-rise building by adding plastic nodes to the frame and using an energy absorber in the elm nodes of the frame-elm scheme, which will reduce the transfer of dynamic loads from seismic vibrations to the frame nodes due to partial dispersion and reduction of the amplitude of these vibrations in "elder nodes". Findings. Based on the results of the analysis, a method of increasing the seismic resistance of the frame of a high-rise building by using new structural solutions is proposed, which would reduce the seismic impact on the frame nodes. On the basis of the problem, a combined solution is presented: the use of plastic nodes in the joints of columns and crossbars of the frame to reduce moments in vertical load-bearing elements, a constructive model of an energy absorber for additional damping of vibrations along the height of the building is proposed, and the principle of its operation under the influence of seismic vibrations is considered; the structural elements of the energy absorber in the elm nodes and their interaction with each other are described in detail. Originality. The analysis of the existing structural schemes of high-rise buildings was performed. The variant of the earthquake-resistant frame of a high-rise building of frame-elm structural scheme with an energy absorber is considered, its design solution and the principle of its operation are described in detail. Practical value. The technical result of the proposed version of the earthquake-resistant frame consists in increasing the seismic resistance and reliability of frame-elm high-rise buildings using the arrangement of elm nodes with an energy absorber, without the use of additional separate earthquake absorbers.