Influence of assembly defects and foundation construction on the stress-strain state of steel lighting masts

The experience of modeling lighting masts in the FEM complex taking into account various factors is considered. The subject of the paper is the study of the influence of taking into account the pile foundation and installation defects in the form of a roll on the stress-strain behavior of the mast. The study considered four calculation schemes for a mass-produced lighting mast: M1 – no slant and no piles; M2 – 12 m long pile, no slant; M3 – 12 m long pile and a slant; M4 – 16 m piles and a slant. The results of the study showed that taking into account installation defects does not have a significant effect on the stress-strain behavior of the masts. Taking into account the joint work of piles with steel structures allows for a more accurate determination of the stress-strain behavior of the masts. At the same time, the calculated displacements can be more than 2 times higher than for masts calculated without taking into account the pile foundation. Also, taking into account the pile foundation leads to a decrease in the natural vibration frequencies of the masts, due to which the pulsation component of the wind load increases, and, consequently, the maximum forces in the elements of the structure.