Vertical Seismic Load on a Long-span Steel Truss

The horizontal component of the seismic acceleration of the foundation during determining the seismic load according to the standard methodology for all types of buildings and their structural elements, is considered. The vertical seismic load calculation is required for certain types of structures. These include the steel beam truss considered in this paper, with spans ranging from 24 m to 40 m. The paper considers a simplified method for determining the dynamic characteristics required to determine the seismic load on the mentioned structure, taking into account the influence of supporting structures. To do this, the approach of reducing a truss to a beam with equivalent stiffness on elastic supports is used. The calculation model also makes it possible to take into account the influence of the considered structure on the supports.