Graduation thesis design of steel observation tower, ground plan is equilateral triangle, which
measures 7,7 m in length and 36,4m in height. The basic structure is made of elements with
equilateral angle profiles. The columns are assembled of two profiles at an angle 60 ° that
enables the connection between horizontal and diagonal on the column. The horizontal
member is box profile which prevents large deflections. The staircase is extended in the rim
of the triangle, which ends at the top with the observation platform 1 m over the structure.
Wind had the biggest influence and is calculated according two standards SIST EN 1991-1-4
and SIST EN 1993-3-1:2007. The last one is relevant for the design. Internal forces are
calculated by finite elements software Scia Engineer. The angle profiles are separately
checked for buckling, because programe does not consider all parameters to properly
calculate buckling. Typical connections are designed. They are mostly pinned. The detailed
drawings are collected at the end.