Bearing capacity of cold-formed unlipped channels with restrained flanges under EOF and IOF load cases

Bearing failure is a form of localized failure that occurs when thin-walled cold-formed steel sections are subjected to concentrated loads or support reactions. To determine the bearing capacity of cold-formed channel sections, a unified design equation with different bearing coefficients is given in the current North American specification AISI S100 and the Australian/New Zealand standard AS/NZS 4600. However, coefficients are not available for unlipped channel sections that are normally fastened to supports through their flanges. Eurocode 3 Part 1.3 includes bearing capacity equations for different load cases, but does not distinguish between fastened and unfastened support conditions. Therefore, an experimental study was conducted to determine the bearing capacities of these sections as used in floor systems. Twenty-eight web bearing tests on unlipped channel sections with restrained flanges were conducted under End One Flange (EOF) and Interior One Flange (IOF) load cases. Using the results from this study, a new equation was proposed within the AISI S100 and AS/NZS 4600 guidelines to determine the bearing capacities of cold-formed unlipped channels with flanges fastened to supports. A new design rule was also proposed based on the direct strength method.

Speilelungen/Reflections

[Book] In recent years "light architecture" has returned as an important component of contemporary architectural design. More and more architects work with lighting designers in order to develop concepts for the nocturnal appearance of their buildings. It is little known that, despite numerous recent technical developments, the vocabulary of today's lighting designers has a long history. The large world fairs of the nineteenth century were the first testing ground for architectural illumination." "This publication juxtaposes historic buildings and architectural visions with recent designs, as well as with contemporary paintings and photographs that reacted to the changing nocturnal skyline. Essays address different aspects of this aspect of architectural history.