Print ISSN: 1681-6900

Online ISSN: 2412-0758

Keywords : Slab

Selection of Best House Construction Materials for Roofs and Walls Regarding Cost, Weight, thermal Insulation and Mechanical Properties

Amer Mohamed Ibrahim; Ahmed Abdullah Mansor; Jaleel Ibrahim Kaduri

Engineering and Technology Journal, 2017, Volume 35, Issue 0, Pages 248-260

Research includes the study of the effect of using different local and low cost construction materials in the
creation of traditional buildings and the effect of using these materials in terms of cost, loads over the soil,
and the thermal insulation.
The research plan on the construct of three rooms has (4 × 5) m dimensions and a 3 m height from different
materials. And adopt its findings on the reality of the buildings in Iraq. It has been concluding that the costs
of stiroboor and thermiston slab were less than the cost of a rigid slab by 43.4% and 21.3% respectively.
And the weight of stiroboor and thermiston slabs were less than weight of rigid slab by 33.8% and 6.6%,
respectively, and the deflection of stiroboor and thermiston slabs were higher than sold slab by 20% and
0.5% respectively.
The thermal conductivity coefficient, and conductance of stiroboor and thermiston slab was less than the
rigid slab by 41% and 20.5% respectively, and that the thermal conductivity coefficient, and conductance
of brick and thermiston walls were less than the hollow concrete block walls by 25% and 66.7%,
respectively. The thermal resistances of stiroboor and thermiston slab were higher than the sold slab by
41% and 20.5%, and that the coefficient of thermal resistance of the brick and thermiston walls was higher
than hollow concrete block walls by 25% and 66.7%.
The energy that needed for stiroboor slab and brick walls room during the day and night were lower by
35.1% and 11.4%, respectively, and for thermiston room by 64% and 54.1%, respectively, compared to the
rigid slab and hollow concrete walls room.

Nonlinear Finite Element Analysis for Punching Shear Resistance of Steel Fibers High Strength Reinforced Concrete Slabs

Eyad K. Sayhood; Samer P. Yaakoub; Hussien Fadhil Hussien

Engineering and Technology Journal, 2014, Volume 32, Issue 6, Pages 1411-1432

This study is devoted to investigate the punching shear resistance of high strength reinforced concrete slabs with steel fibers by using the well-known (P3DNFEA), a non-linear finite element program for three-dimensional analysis of reinforced concrete structure.
Nine high strength reinforced concrete slabs with steel fibers and one without steel fibers, have been analyzed in the present study. The finite element solutions are compared with the available experimental data. In general, accepted agreement between the numerical results and the experimental results has been obtained.
Parametric studies have been carried out to investigate the effect of concrete compressive strength, steel fiber content, amount of steel rebars, slab depth and column dimensions on the behavior and ultimate strength of reinforced
concrete slabs.
The numerical analysis indicated that the increase in the concrete compressive strength (f'c) from 40 to 80 MPa has led to an increase in the strength by 69% and 84% for slabs without and with 0.5% steel fibers respectively. The numerical analysis indicated that by using 2.0% steel fibers, the ultimate capacity is increased by 81.7%, compared to a slab without fibers.
Also, the finite element solution revealed that increasing the longitudinal reinforcement ratio in the slab from 1% to 2% led to an increase in the ultimate shear strength of about 57%.

Effect of Boundary Conditions on Impact Resistance of Concrete Slabs

Eyad K. Sayhood; Nisreen S.Mohammed; Sabah K. Muslih

Engineering and Technology Journal, 2013, Volume 31, Issue 5, Pages 841-860

A theoretical analysis based on the numerical solution of the slab impact integral equation is carried out to determine the impact force and deflection time histories, the strain energy absorbed by the slabs and the maximum bending moment.
Effect of slab boundary conditions on impact response of slab is also discussed. The theoretical results obtained in the present analysis are compared with experimental and theoretical works previously done. A good agreement is found between theoretical and experimental results. This indicates that the impact resistance of relatively large slabs may be predicted by using the theoretical approach based on equation of undamped slab vibration. All the derivations required to predict the effect of boundary conditions are performed for both forced and free vibrations. For the same falling mass and the same applied kinetic energy (height of drop) for all cases, the maximum central deflection and the maximum impact force are affected by the boundary conditions of the slabs