2024/01/29 by Agahanov, Elifkhan Kerimhanovich, Agahanov, Murad Kirimhanovich, Trufanova, Elena Vasilyevna
Mathematics · #Civil engineering #FOS: Civil engineering #FOS: Mathematics #FOS: Mechanical engineering #Mathematics #Mechanical engineering
paper · doi:10.48612/dnitii/2023_49_17-24
The purpose of the work is to simulate the behavior of a long-span structure under dynamic influence and studying the influence of system rigidity on the frequencies and modes of natural vibrations of the structure. A numerical research method was used - the finite element method. Using the Lyra-CAD and SAPFIR software packages, a finite element model of a beam design scheme using the finite element method was developed to conduct a study of the complex on the dynamic impact and determine the frequencies and modes of natural vibrations of a long-span structure. Modal analysis was carried out. To obtain a sum of modal masses of more than 90%, more than 300 natural vibration modes are taken into account. The first and second modes of vibration are translational, and the third is torsional. A new communication system has been developed, which differs from the first in the presence of spatial trusses between the main supporting structures and an increased number of encircling trusses. A modal analysis was carried out for the second version of the design scheme. To collect 90% of the modal masses, more than 195 forms are taken into account. The first and second forms are translational, as for the first option, and the third represents the vertical movement of the support ring. Based on the oscillation frequencies and modal masses, the second design option was selected as the main design scheme and its calculation for the dynamic effect from the pulsating component of the wind load was carried out.