FREE STRAINED DISSOLUTION OF HOT-ROLLED JOISTS TO T-BEAMS OF VARIABLE ALTITUDE FOR PERFORATED BEAMS
The paper is concerned with the problems of engineering and application rationality of perforated wall beams. The typical joist internal stress diagram has been cited. Special attention has been given to the effect of heating on the internal stresses and their redistribution. The diagram having formed in the beam by means of preheating of the profile wall and its cut on the Z-shaped line and also the dissolution process of the hot-rolled joist by gas torches have been presented. The behaviour features of the finished structure and its internal stressed state have been detailed. The strength test of the perforated joists in the section moderated by holes on the maximum normal stress has been conducted. The paper is oriented on further investigation of the stressed state of the perforated beams, minimization opportunities of consumption of human labour and cost, bearing in mind their manufacturing procedures and techniques.