ON THE POSSIBILITY OF CHANGING THE ANGLE OF SLOPE OF THE UPPER BELT SERIAL TRUSS FROM THE BENT-WELDED PROFILES

Abstract

In the article, a problem of increasing the angle of slope of the upper belt of the roof truss made from the bent-welded profiles is solved. The need to increase the angle of slope of the upper belt is determined by the fact that when constructing a roof from a sandwich panel, the minimum slope should be 7° or 12 %. In the current series 1.460.3-23.98, the slope of the upper belt of trusses is accepted as 10 %. The article analyzes the changes of forces in the elements of truss from the bent-welded profiles while changing the angle of slope of the upper belt. SCAD Office 21.1 software programme is used for simulating the work of truss from the bent-welded profiles. When creating the design scheme, the eccentricities occurring in the nodes of trusses from the bent-welded profiles were taken into account. The eccentricities were accounted by shifting the connections of the grid elements along the belt axis. It is shown that change of the truss height results in decrease of longitudinal forces of the grid elements and increase of nodal bending forces. Verification calculations accounting the changed efforts in the nodes were performed