Abstract
Currently, the castellated steel beams are used widely because of their useful structural applications and serviceable performance due to their good significant properties such as light weight, facility in construction, materials economize and strength. The castellated steel beam fabricated from its origin solid beam (I-beam) by cutting its web in a zigzag path and then re-joined the two halve by welding so the height of the castellated beam expanded about 50%. The aim of this paper is to study the effect of castellation with and without strengthening on the structural behaviour of castellated beams and compare the results with the origin solid steel beam. Three castellated beams with deferent configuration in addition to solid beam subjected to two equal point loads at mid third of span with simple support condition were analysed numerically using finite element analysis by Abaqus software virgin (6.14.5) .The results show that the load carrying capacity values of castellated steel beams that represent (second, third& fourth) models were increased by (39.11,105.95&124.77) % respectively compared with origin solid beam due to increase beams stiffness after castellation and strengthening process, while mid-span deflection values at service load were decreased by (36.36,9.10&27.27) % respectively comparing with the origin solid steel beam due to increasing section dimensions and stiffness after castellation process and using strengthening technique respectively. Also it was seen that the maximum ultimate moment and ductility were observed in the fourth model that strengthened by high strength concrete and lacing reinforcement so they increased by 124.79% and 165.65% respectively as compare to reference beam, while the third model that strengthened by high strength concrete was stiffer than other beams.
Highlights
Castellated steel beam is expanded beam manufacturing by expanding standard rolled sections in a method which produce a uniform shape of opening in the web
The results show that the load carrying capacity values of castellated steel beams (CB1, CB2 and CB3) were increased by 39.11, 105.95 and 124.77% respectively compared with origin solid beam (SB) due to increase beams section depth and rigidity after castellation and strengthening process, while mid-span deflection values at service load were decreased by 36.36, 9.10 and 27.27% respectively comparing with the origin solid steel beam due to increasing section dimensions and stiffness after castellation process and using strengthening technique respectively
For unconfined castellated steel beam, it was noted that the load carrying capacity was increased by 39.11% and mid-span deflection at service load was decrease by 36.36% as compared with origin solid steel beam
Summary
Castellated steel beam is expanded beam manufacturing by expanding standard rolled sections in a method which produce a uniform shape of opening in the web. Open web beams have a high depth – to – weight ratio, expanded section modulus, Sx and expanded strong – axis moment of inertia, Ix. Open web beams have a high depth – to – weight ratio, expanded section modulus, Sx and expanded strong – axis moment of inertia, Ix These increments lead to increase spans length that is useful for wide span option by designers, increasing stiffness and strength of standard section, decreasing deflection compare with the original beams. Castellation proses produced beams with 50% deeper than the origin beam, enhanced the moment capacity up to 40% without adding steel and increasing load capacity with reducing beam weight [1]
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