Traffic Light Pole

Figure 1 shows a traffic light pole.

The structure consists of a tower crane-like frame with one back and two front stay cables. Figure 2 shows a side view of the intersection region.

The stiffness of the vertical profile S1 is bigger than the horizontal one S2. The stay cables are tensioned by turnbuckles, which are connected to the circular hallow profiles by plates. A schematic lateral view of the above shown traffic light pole and a variant without back sector is shown in figure 3.

The red arrows represent forces, and the blue arrows indicate the vertical displacement direction of the free-ends, assuming that both structures are equal except for the back sector.