Assessment of coconut fibre insulation characteristics and its use to modulate temperatures in concrete slabs with the aid of a finite element methodology

2011 ◽  
Vol 43 (6) ◽  
pp. 1264-1272 ◽  
Author(s):  
N.J. Rodríguez ◽  
M. Yáñez-Limón ◽  
F.A. Gutiérrez-Miceli ◽  
O. Gomez-Guzman ◽  
T.P. Matadamas-Ortiz ◽  
...  
Keyword(s):  
Finite Element ◽  
Concrete Slabs ◽  
Coconut Fibre ◽  
Finite Element Methodology

scholarly journals Deformations of R.C.Circular Slabs in Fire Condition

2018 ◽  
Vol 4 (4) ◽  
pp. 712 ◽  
Author(s):  
Abdelraouf Tawfik Kassem
Keyword(s):  
Finite Element ◽  
Reinforced Concrete ◽  
Slenderness Ratio ◽  
High Surface ◽  
High Surface Area ◽  
Concrete Slabs ◽  
Finite Element Models ◽  
Reinforced Concrete Slabs ◽  
Fire Condition ◽  
In Fire

Reinforced concrete slabs are elements in direct contact with superimposed loads, having high surface area and small thickness. Such a condition makes slabs highly vulnerable to fire conditions. Fire results in exaggerated deformations in reinforced concrete slabs, as a result of material deterioration and thermal induced stresses. The main objective of this paper is to deeply investigate how circular R.C. slabs, of different configurations, behave in fire condition. That objective has been achieved through finite element modelling. Thermal-structural finite element models have been prepared, using "Ansys". Finite element models used solid elements to model both thermal and structural slab behaviour. Structural loads had been applied, representing slab operational loads, then thermal loads were applied in accordance with ISO 843 fire curve. Outputs in the form of deflection profile and edge rotation have been extracted out of the models to present slab deformations. A parametric study has been conducted to figure out the significance of various parameters such as; slab depth, slenderness ratio, load ratio, and opening size; regarding slab deformations. It was found that deformational behaviour differs significantly for slabs of thickness equal or below 100 mm, than slabs of thickness equal or above 200 mm. On the other hand considerable changes in slabs behaviour take place after 30 minutes of fire exposure for slabs of thickness equals or below 100 mm, while such changes delay till 60 minutes for slabs of thickness equals or above 200 mm.

Finite Element Synthesis for Design Optimization

2012 ◽  
Author(s):  
Mahmoud R. Saad ◽  
Sayed M. Metwalli
Keyword(s):  
Finite Element ◽  
Topology Optimization ◽  
Design Optimization ◽  
Linear Relation ◽  
Stiffness Matrix ◽  
Allowable Stress ◽  
Uniform Stress ◽  
Mechanical Structure ◽  
Finite Element Methodology

The present work introduces a new Finite Element methodology that can be used directly in calculating and optimizing the thickness of a mechanical structure. This method depends on the constant strain triangle model after assuming different thicknesses at the elements nodes. A linear relation between the nodes thicknesses is assumed and a new stiffness matrix is created. Nodes thicknesses are optimized using the developed HGP method to reach uniform stress among the structure to satisfy the constrained allowable stress designated by the designer. Examples and sample applications are employed for comparisons and their results culminate in removing unnecessary elements and increasing the thickness, which is subjected to high stresses. Results indicate marked improvements and potential for topology optimization.

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