LVL–structures made as combined section with small-compliance connections, consistent with stress-strain state of structural elements

Abstract

The use of composite structures of LVL elements of I-beam and box-shaped cross-section is the most expedient from an economic point of view. Applications for connecting the individual parts of the cross-section of ductile connections - self-tapping screws, allows you to assemble such structures at a construction site. The use of self-tapping screws installed in accordance with the direction of the tensile internal forces of the structure makes it possible to force self-tapping screws to work mainly in tension. At the same time, the most rational work of the joints is achieved — minimum work on bending and maximum work on stretching. According to the results of tests, manufactured and designed beams of composite section, it was concluded that box-shaped beams have greater load-bearing capacity and less deformability. The ratio of actual and calculated bearing capacities of composite box-section beams is higher, the required value of the safety factor, and the destruction of the test beams occurred wood, which indicates the safety margin of the connection of the elements of the composite section on the stretched self-tapping screws.