WEB CRIPPLING BEHAVIOUR OF COLD-FORMED STEEL CHANNELS WEB HOLES UNDER END TWO FLANGE (ETF) LOADING

The design of the web-crippling behavior of cold-formed steel elements (CFS), which have been widely used in recent years, is essential. The concentrated loads acting on CFS members cause the section's web to crush and buckle. For this reason, it is necessary to calculate the web crippling strength correctly in the design of CFS sections. In order to observe the web-crippling behavior of CFS channel sections with holes drilled in the webs, this paper presents experimental and numerical experiments. Seven sections of the real-world system intended for End Two Flange (ETF) loading scenarios underwent testing. The tested cells were simulated by the finite element method with ABAQUS software. As a result of the numerical studies, 150 different model finite element analysis results are presented in the parametric study. In addition, the equations proposed by AISI and Eurocode 3 for the web-crippling design of CFS channel sections without web holes are analyzed. The findings of parametric investigations are compared with the design equation for sections with web holes presented by Uzzaman et al., and new coefficients are suggested for this equation. As a result of the study, the distance from the hole to the loading plate of CFS channel sections affects the section bearing capacity. Increasing the hole diameter drilled into the section web reduces the bearing capacity of the section. It is seen that h/t and N/t are more effective than R/t in the equation proposed by AISI for predicting the web-crippling strength of CFS channel sections.