Paper Title
Finite Element Investigation of Cold form Rectangular Hollow Flanges Steel Beams with Opening in Webs

Abstract
The aim of this work is the investigation and comparison of the behaviour of hollow flange steel beams and web contains openings with different location and sizes. The analytical models were used to calculate the deflection depending on the ultimate load capacity. ANSYS software was used to produce the analytical models, where ANSYS analysed hollow flange steel beams for concentrated load in the centre and constant support condition. As well as ANSYS models studied the effect of different location, number and size of square holes in web of beams models. All the beam models are is four meter length with the dimension of 400 mm beam depth, 320mm web depth, 100 mm flange width. The dimension of square opening is with 160 mm, 200mm and 240mm, which represent 0.4, 0.5 and 0.6 of the depth, respectively. The thickness of all steel section 2.5mm. The results of the models analysis showed decreasing in the ultimate load when the distance between holes decreased and the decreasing ratio as following: (4.3% to 11%) at distance ((d-a)/2) from support, (4.6% to 11%) at distance (0.25m) from support, (4.3% to 10.5%) at distance (0.5m) from support, (4% to 10.22%) at distance (0.75m) from support and (4% to 10.5%) at distance (1m) from support. Keywords - Cold-formed steel, Hollow flanged, Non-Linear Finite Element Analysis, Square Opening Web.