Advertising stele 35 m high in Krasnodar
Head engineer – M. Marinichev
Technical servey – N. Kochnev
Calculation of high core structures: chimneys, advertising racks, navigation towers - requires special attention when taking into account wind pulsation loads, causing the loss of stability of such metal structures.
When calculating the advertising stela with a design height of 35 meters, we were faced with the fact that the lower support section delivered to the site, the thickness of the wall according to the project was 16 mm, in fact it turned out to be 12 mm. The section was already assembled, and our specialists needed to find a solution to avoid dismantling the metal structure. In connection with the identified non-compliance, it was decided to strengthen the cross-section of the rack by introducing longitudinal ribs in the form of I-beams with a section height of 120 mm.
The task was successfully solved. The actual load-bearing capacity of the section allowed even to add one more row of billboards at the top.
During the operation of metal structures, we have repeatedly observed the movements of the top of the stele with significant gusts of wind. The maximum displacement did not exceed 420 mm, which corresponded to the expected values.
Figure 1. FEA model of the structure
Min Ss = -218844 кН/м2, Max Ss = 178414 кН/м2
Compressive forces with a combination of «left wind» loads
Min Ss = -218511 кН/м2, Max Ss = 178677 кН/м2
Compressive forces with a combination of «right wind» loads
Figure 2. Maximum compressive forces in the walls of the lower section of the support tube for different directions of the wind load
Figure 3. General view of stele height of 35 m