الفهرس 
LITERATURE REVIEWOnly 14 pages are availabe for public view
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Abstract
This research was carried out to investigate the validity of using LWC slabs in steel-concrete composite beams and compares their behaviour with the NWC slabs. The main goal of this study was to propose a suitable equation to calculate the effective width of LWC slabs acting compositely with steel beams and to check its possible applicability for NWC slabs as well. All parameters affecting the effective slab width were experimentally and/or numerically investigated in this research program. In addition, the proposed equations for the effective width were compared with the codes provisions of ANSI/AISC 360-10 and CAN/CSA S16-14. Moreover, the slip values at the steel-concrete interface were measured at the elastic stage and were used to calculate the effective moment of inertia of SCC beams. The findings of this study will enable engineers to predict accurate behaviour for SCC beams at both the serviceability and ultimate stages.
The mechanical properties of the LWC were experimentally measured and characterized in this study. Generally, this LWC presents similar characteristics in terms of ultimate and tensile strength behaviour to the NWC with the same concrete compressive strength. On the other hand, two major differences between the LWC and NWC were clearly identified, which are their densities and moduli of elasticity. The values of these two characteristic parameters are lower than the counterpart values for a NWC with the same compressive strength. The value of concrete density determined for the LWC is 78% of the density of a NWC. The modulus of elasticity value is 58% of the corresponding value of a NWC.
The experimental program consisted of testing eight steel beams connected to concrete slabs using welded steel channel connectors. Seven beams were cast using LWC of a density equal to 18.50 kN/m3, while one beam was cast using NWC of density equal to 23.50 kN/m3. The main testing parameters are the slab width, steel section, beam span and spacing of shear connectors. A numerical model (Model 1) using strain computability and force equilibrium was developed to determine the effective concrete slab width of each tested beam and to evaluate the effect of beam’s span and slenderness ratio on the effective concrete slab width.
Another numerical model (Model 2) using a non-linear finite element program “Abaqus6.10” was also developed. The model was verified against the experimental results and showed good agreement with the results of the tested beams. The validated model was then used to conduct a parametric study on 222 SCC beams to examine a wider range of parameters and to propose design guidelines for such beams.