Thin‐walled cold‐formed steel elements represent an attractive structural solution due to the fast manufacturing and erection time on site. Their small thickness leads to imperfection and eccentricities sensitivities. An experimental program was performed on short members with lipped channel cross‐section of 150×60×20×2 mm, subjected to (1) eccentric compression about the minor axis, in a range of eccentricities between −40 mm and +40 mm and (2) eccentric compression about the major axis, in a range of eccentricities between 0 mm and +90 mm. Shortening of all specimens was measured in two ways, i.e. (1) using the displacement gauge integrated with the machine crosshead beam and (2) from deformation fields obtained using Digital Image Correlation system (DIC). The quantitative results, presented as ultimate loads vs eccentricity curve, emphasize the influence of the eccentric load on the capacity of the element and on the type of plastic mechanism formation. Finite element analyses were performed to simulate the behaviour of short members in eccentric compression using the commercial FE software ABAQUS/CAE. Static non‐linear analyses were carried out in displacement control. Both geometrical and material non‐linearities were included. The experimental results confirm two different basic failure mechanisms depending on the load eccentricity direction applied to the studied members with open cross‐section.
Thin-walled cold-formed steel elements represent an attractive structural solution due to the fast manufacturing and erection time on-site. Their small thickness leads to imperfection and sensitivities to eccentricities. An experimental programme was performed on short members with lipped channel cross section, subjected to eccentric compression about the minor and major axes, in a large range of eccentricities. The specimens were manufactured on a folding machine. Before testing, the dimensions of all specimens were measured. Shortening of all specimens was measured in two ways, i.e., 1) using the displacement gauge integrated with the machine crosshead beam and 2) from deformation fields obtained using digital image correlation (DIC) system. The quantitative results, presented as the ultimate loads versus the eccentricity curve, emphasise the influence of the eccentric load on the capacity of the element. Finite element (FE) analyses were performed to simulate the behaviour of short members in eccentric compression using the commercial FE software ABAQUS/CAE and ANSYS. Static non-linear analyses were conducted in displacement control. Both geometrical and material nonlinearities were included. An isotropic linearly elastic-perfectly plastic constitutive model was considered, with von Mises yielding the criterion and associated flow rule. Failure modes were identified due to numerical and experimental tests. Plastic mechanism models were derived, resulting in the derivation of post-ultimate, rigid-plastic curves, characterising a post-ultimate structural behaviour.
The objective of this paper is to quantify the slippage and rotation in the connections of a double xed corrugated web beam. Two types of connections between the component parts of the built-up beam were used, i.e. MIG brazing and spot welding, which offer different rigidities and bearing capacities for the built-up beams. Experimental tests were conducted on three MIG brazed and two spot welded specimens, respectively. The test setup consisted of a six-point bending con guration which is equivalent to a uniform distributed load applied to the beam. The load was applied from a 500kN actuator through a leverage system that allowed the distribution of the force. An out-of-plane structure prevented the beam from lateral torsional buckling. The testing exhibited relatively large slippage and deformation in the bolted connections and in the supporting device, respectively. However, the high rigidity of the beam maintained the mid-span deflection in the serviceability limit state limits. The built-up corrugated web beams made of cold-formed steel pro les represent an ef cient and suitable structural solution for buildings. Nevertheless, experimental research due to inevitable slippage and the endplate deformation must be performed to characterize the connection.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.