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The development and use of the tubular beam, 1830–1860
Published in Robert Thorne, Structural Iron and Steel, 1850–1900, 2017
In the case of tubular girders some of these effects were resolved with the developments that took place from 1855 onwards. The construction, in 1860, of a multi-spindle drill meant that up to 80 holes at a time could be accurately drilled in the wrought iron plates required in a built-up plated boom. This meant that the rigidity required could be achieved by riveting together layers of plates, often totalling 4 inches in thickness, and the drilling and riveting of only one plate, as in the tubular form, was no longer an advantage. The advent of steam and hydraulic riveting machines meant that joints could be made more accurately and soundly and the availability of better-quality wrought iron, and later steel, provided a material with more reliable and standard qualities. Again, more efficient rolling mills meant that large-size ‘I’ sections could be produced, thus making the built-up plate girder less necessary.
Free out-of-plane vibration of cracked curved beams on elastic foundation by estimating the stress intensity factor
Published in Mechanics of Advanced Materials and Structures, 2020
Curved beams have found widespread applications in different industries, some of which are mechanical devices such as C-clampers, crane hooks, frames of presses, riveting machines, bearings, and many other machine parts; as well as, building arches and bridges. Such frequent applications of curved beams as industrial components make it essential to investigate the behavior of them. Since, over time, a variety of reasons may cause deterioration of beams, it is important to study the effect of the most common fault which is crack on their behavior for the purpose of preventing probable accidents.