Abstract
Upper-bound estimation of the load-capacity of cold-formed steel sections (TWCFS) with perforations, subjected to axial compression is presented. The estimation is performed on the basis of the Yield Line Analysis ((YLA). TWCFS lipped channel sections with two sets of perforations (on the web and on the flanges) are under investigation. The comparison of experimental results, FE simulation results, European code ultimate strength predictions and upper-bound estimation based on YLA approach is carried out and presented. Some conclusions concerning an applicability of the YLA approach for ultimate strength prediction of perforated TWCFS structural members are derived
Highlights
Nowadays, a variety of different steel products, with a large diversity of shapes, sizes, and applications are produced using the coldforming process
In all tested specimens the failure was initiated in the area of perforation and, subsequently, local plastic mechanisms were developed in this area
The basic assumption is that the plastic mechanism is fully developed, and the plastic zones developed in the walls of thin-walled steel members are concentrated at yield lines, either stationary or travelling [26, 27]
Summary
A variety of different steel products, with a large diversity of shapes, sizes, and applications are produced using the coldforming process. The problem of the load carrying capacity of such members subjected to simple loading systems (pure bending or uniform compression) has been with satisfactory accuracy solved within the theory of thin-walled structures, as well as in design code specifications [29, 31, 39] This theory provides sufficient methods of the load-carrying capacity evaluation, among them effective width method [12, 39], Direct Strength Method – DSM [24, 30]. The problem of the load carrying capacity (l-c-c) of such members subjected to simple loading systems (pure bending or uniform compression) has been satisfactorily solved within the theory of thin-walled structures, as well as in design code specifications [32]. One of the solutions is an appropriate upper-bound estimation of l-c-c
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