Viper Rooms (Beginner)
APPLIED LOADS
DESCRIPTION AND LOCATION
I’m sure you’re quite familiar with this sign, from our local Viper Rooms Club on Carver St., Sheffield. The yellow and maroon logo seemingly floating on top of a black column is not only considered a fresher landmark, but also an engineering one.
When analysing the applied loads one should always remember the self-weight of structural members; in this case we have the weight of the logo (maroon) and the column (black). The most apparent load is wind load hitting the sign, with less apparent horizontal loads like people leaning on the column. Vertical loads are nominal, although there would be some vertical wind pressure or pigeons standing on top of the sign.CONCEPTUAL/QUALITATIVE BEHAVIOUR
Supports:
The sign, like many signs out there, only has one support - the column. The weight of the sign and the wind loading must be transferred through the column to the ground. The column has a circular section which is both aesthetically appealing and efficient in resisting bending in any direction due to the equal distribution of material about the neutral axis.
Dead Loads (Permanent Actions):
The dead load here is the weight of the sign and column. The interaction of the forces around the sign are a bit complicated for now so we are going to simplify it into a ‘T’ shaped structure.
The simplification in this case is acceptable as the vertical loads aren’t the critical loads here, the wind is!! (In the next section).
The analysis of this structure should be easy now; the value of the point loads multiplied by the lever arm (distance to centre of column) gives the moment at the middle. The moments will be in opposite directions and cancel out in the middle.
The vertical reaction in the column equals the sum of the point loads (for vertical force equilibrium). The shear force diagram will therefore be: