Print ISSN: 1681-6900

Online ISSN: 2412-0758

Keywords : parametric study

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.

Development of Three - Layer Composite Steel - Concrete - Steel Beam Element with Applications

Jamal A. Farhan; Hussain M. Hussain

Engineering and Technology Journal, 2010, Volume 28, Issue 24, Pages 6970-6985

In this study, a general linear one-dimensional finite element beam model is developed for the analysis of the three layer composite steel- concrete- steel beams which are a special case of the multi-layer
Connectors, concrete layer thickness, plate thickness, type of loading and concrete compressive strength composite beams. The model is based on partial interaction theory of composite beams where the flexibility of shear connectors is allowed. A program is constructed using VISUAL BASIC language to analyze this type of beams. Numerical applications are presented to demonstrate the validity and applicability of the present method. A parametric study is carried out to demonstrate the effect of some parameters including the variation of shear stiffness of shear on the behaviour of three-layer composite beams. The results of
the proposed programmed model shows a good agreement with those obtained by finite elements method using ANSYS program (Release 11, 2007. The models used in ANSYS program are shell element, brick element and combine element to simulate the behaviour of steel plates, concrete part and shear connectors respectively