Influence of the shape of reinforcing window profiles on the strength and torsional stiffness of windows

Leading European manufacturers of profiles intended for the production construction joinery currently use mainly PVC with various configurations external and internal shapes, allowing functional products due to their use, shape, possibility building them, maintaining color low thermal transmittance coefficients profiles. It is important obtain high cross-sectional strengths, especially torsion bending. related wind loads structures. A profile made a Young’s modulus compared other materials, thus it has stiffness strength indicators. This leads relatively easy deformation during assembly. To avoid this unfavorable effect, are reinforced steel sections. Currently, in industry producing profiles, open reinforcement almost exclusively used. solution very disadvantageous reasons stiffness. However, such primarily technological price reasons. Closed pose many problems approx. 30% more expensive corresponding paper presents research on closed stiffening sections place The main advantage times greater bending torsional theoretical experimental studies carried out selected cross-sections have shown that stresses several lower than an identical profile, even dozen higher profile.