Reccomended solution to the problem.
If we have time then we should wait for the steel beam because steel beam is more efficient.
Explanation
Since the elastic modulus of Aluminium is about 1/3 that of Steel, for the same beam shape properties, for the same loading, for the same span and support conditions, the Aluminium beam deflection will be three times more.
Density of steel is coincidentally about three times more than that of aluminium and so the same beam in steel will be three times heavier.
If subjected to same loading and having same moment of inertia of the cross section, aluminum beam will deflect more.
The reality is that the relative cost of selecting one or other
material depends on the required application. However, as a little
background:
The cost of steel varies according to its grade. By weight
commercial grades can cost anything from about 1/2 the cost of .
However, aluminium is about 1/3rd the density of steel, which means
it breaks even with even the cheapest steel .
Since the havier section is requred to meet the requirement so more time will be consumed for fabrication leading to the delay in project completion.
You are the project manager's assistant on a construction site. The project manager is off site...
You are the project manager's assistant on a construction site. The project manager is off site for the day and you are responsible for the ongoing progress of the site in her absence. Two similar beams are delivered to a construction site. Each beam is a hollow box beam, constructed of A36 structural steel, (E=29.0 x 106 psi, density of 490 lbm/ft?), each beam having outside dimensions of 16" base and 18" height, 18 feet long. Beam A has top...
You are the project manager's assistant on a construction site. The project manager is off site for the day and you are responsible for the ongoing progress of the site in her absence. Two similar beams are delivered to a construction site. Each beam is a hollow box beam, constructed of A36 structural steel, (E=29.0 x 106 psi, density of 490 lbm/ft?), each beam having outside dimensions of 16" base and 18" height, 18 feet long. Beam A has top...
Two similar beams are delivered to a construction site. Each beam is a hollow box beam, constructed of A36 structural steel, (E=29.0 x 106 psi, density of 490 lbm/ft?), each beam having outside dimensions of 16" base and 18" height, 18 feet long. Beam A has top and bottom wall thicknesses of 0.5" and side wall thickness of 0.375". Beam B has top and bottom wall thicknesses of 0.4375" and side wall thickness of 0.3125". The structure to be constructed...
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