Covering a single-storey industrial building with wide box-shaped beams of stepwise-varying height

The article proposes a precast monolithic covering of a one-storey industrial building, consisting of 3 m wide box-shaped roof beams of stepwise-variable cross-section limited by a third-degree parabola. The beams are supported on the girder supporting roof trusses, installed in a row and connected with a monolithic insert that complements the plate of the upper chord of the beam to a single roof slab. Roof beams perform both load-bearing and enclosing functions. The height of the covering in the middle of the span is 1.5 m instead of 3.75 m in the typical solution -when laying ribbed slabs on roof trusses. The covering is distinguished by the simplicity of installation: the number of lifts and the volume of field welding are minimal; no temporary fastenings are required; erection works and the installation of monolithic inserts can be combined; and covering configuration simplifies the construction of networks of sewerage. The results are given for buildings with spans up to 24 m and 3 m wide box-shaped roof beams of stepwise-variable cross-section.