Analysis of Lateral Torsional Buckling and Dimensioning for I-Sections, C-Sections and Z-Sections Purlins

摘要

The bent beam may lose overall or local stability of the web or compression belt depending on the type and manner of load, shape and geometric features of the cross-section, length, support conditions or indirect spring constraints. The purpose of this article is to determine the critical moment of loosening for purlins using three sections, namely IPE 140, CE 140 and Z300 ×94× 86 ×30 ×2.5, assuming their cross-sectional values are as close as possible to each other. In order to determine the bearing capacity of the cross-section of the beam, it is necessary to determine the critical moment of the deflection ie the loss of flat bending form with twisting with respect to the longitudinal axis. Only for the case of constant load torque is known an analytical solution in closed form [1-3]. Other waveforms of bending moments are included in the analytical formula by the factor C1 [5]. For complex support conditions, you can use numerical programs to calculate the finite element method. For more detailed description of the beam, you must model the shell elements