Print ISSN: 1681-6900

Online ISSN: 2412-0758

Keywords : ANSYS program

Parametric Study of Continous Composite Steel-Concrete Beam with External Prestressing

Amer M. Ibrahim; Wissam D. Salman

Engineering and Technology Journal, 2015, Volume 33, Issue 3, Pages 738-752

In the present study, three-dimensional nonlinear finite element analyses were conducted to investigate the effect of several important parameters on the behavior of the external prestressed continuous composite steel-concrete beam. These parameters included the effects of concrete compressive strength, ratio of effective prestressing to ultimate stress (fpe/fpu), external prestressing technique, ratio of thickness to width of concrete slab (T/B), transfer load point to mid span section, type of loading, full and partial interaction, tendon profile, and number of stiffeners. It had been found that, at increasing the concrete compressive strength from (20 to 60MPa) and the ratio of prestress to ultimate stress from (0.264 to 0.79), the ultimate load was increased by about (19.64%) and (9.05), respectively. The ultimate load of a continuous composite beam with external prestressing was increased by about (26.63%) than the same continuous beam without prestressing. The increase in the ultimate load of the continuous beam subjected to three point loads on each span was (25.93%) larger than that of the continuous beam with a single load on each span. It was noted that the ultimate capacity was increased by (7.32%) when draped tendon profile was used. Also it was noted that the ultimate load of beam with full interaction is (3.25%) greater than the same beam with partial interaction. Increasing the thickness to width of concrete slab ratio, from (0.1 to 0.25) with constant area of concrete, led to an increase in the ultimate load by about (6.60%). It was noted that the ultimate capacity increased by about (8.25%) when number of stiffeners were increased from three to seven.

Nonlinear Behavior of Steel-Concrete Composite Beams Curved in Plane with CFRP Strips Bonding

Ahmed F. Kadhum

Engineering and Technology Journal, 2010, Volume 28, Issue 12, Pages 2308-2324

This paper deals with the behavior of structural steel-concrete composite beams
curved in plane. The analytical investigation included the use of three dimensional
nonlinear finite elements to model the performance of the composite beams
strengthened with CFRP strips by using (ANSYS 11.0) computer program. The
numerical results showed very good agreement with the experimental results reach
to 100% before the strengthening, while the increase in strength after the curved
strengthened with CFRP strips 32% for the curve beam with L/R equal to 0.05 and
48% for the curve beam with L/R equal to 0.10 and 53% for the curve beam with
L/R equal to 0.25.

Buckling Analysis of Composite Laminated Plate with Cutouts

Hani Aziz Ameen

Engineering and Technology Journal, 2009, Volume 27, Issue 8, Pages 1611-1621

The determination of critical buckling load of composite plate is an
important factor in determining the structural stability, which was done by ANSYS
program and experimental investigation was carried out on many specimens of
composite material of E-glass fiber reinforced polyester plastic materials with
different no. of layers. Five cases are studied to show the effect of cutout’s
parameter on the structural stability in which the shape ( circle, square, rectangle),
size (20, 30, 50 ) mm, rounding corner (5, 7.5, 10)mm and orientation of cutouts
(0°,30°,45°,60°) are presented . Also the effect of plate thickness (no. of layer) is
studied .
In general , the results of the square clamped laminated plates with circle
cutout come out in a good agreement. Which is decrease of buckling load of the
plates with change the shape from circle, square and rectangle and in case of cutout
size. The critical load is still constant with the radii rounding corner and increased
with increasing the cutout orientation and the thickness of the plate. The effect of
cutout will determine the increase or decrease of the buckling