Weekly update:

Leaning more about FEA and Concrete grades was this week's moto:

A FEA is carried out to find strength of HST and CFST structures. The summary is as follows.
• Initially both Hollow Tube and CFST geometries are built 
• Buckling analysis is carried out in both Hollow Tube and CFST domain
• The stresses are very high in the small slenderness ratio of Hollow Tube region and for nonlinear analysis the stresses are very less in the high slenderness ratio of CFST.
• The results show the Hollow Tube buckling load carrying capacity less compared to the CFST buckling loads.

Initially both theoretical and analysis values are compared to check Finite element solution with theoretical calculations. Also graphical plots are represented to find effect of thickness, diameter, and slenderness ratio on stress and buckling strength estimates.

This study focuses on modelling of concrete filled steel tube (CFST) column under axial loading. The main parameters of FEA are circular and square column with varying grades of concrete (30, 50, 70, 90 N/mm2). It is concluded that the deformation of the column is decreasing 10-15 percentage with increasing grade of concrete.

The following conclusions can be drawn.

1. The deformation is in circular section is smaller compared to square section. This is because circular section takes confining effect better than square section.
2. The equivalent stress value becomes constant after achieving its ultimate strength.
3. Deformation decreases with increasing grade of concrete, but for higher grades of concrete decreasing in deformation are less.
4. Stress concentration is more at the edges of square column while in circular column, due to confining effect, stress concentration is equal throughout the whole section.



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