Wind-resistant design of solar street light pole
Solar street light In the solar street light system, a structural issue that requires great attention is the design of wind resistance. The wind resistance design is mainly divided into two parts, one is the wind resistance design of the battery module bracket, and the other is the wind resistance design of the light pole.
According to the technical parameter data of the battery module manufacturer, the upwind pressure that the solar battery module can withstand is 2700Pa. If the wind resistance coefficient is selected as 27m/s (equivalent to a tenth typhoon), according to the non-viscous fluid mechanics, the wind pressure on the battery module is only 365Pa. Just thinking about lighting, so the component itself can withstand the wind speed of 27m/s without being damaged. Therefore, the key consideration in the design is the connection between the battery assembly bracket and the light pole.
In the design of the street light system, the connection design of the battery assembly bracket and the light pole uses a bolt rod to fix the connection.
Wind-resistant design of street lamp pole
The parameters of street lights are as follows:
Battery panel inclination A = 16o pole height = 5m
Solar street lamp manufacturers design and select the welding seam width at the bottom of the pole δ = 4mm, the outer diameter of the bottom of the pole = 168mm
The surface where the weld is located is the destruction surface of the light pole. The distance from the calculation point P of the resistance moment W of the lamp pole failure surface to the line of action of the solar panel load F received by the lamp pole is
PQ = [5000+(168+6)/tan16o]× Sin16o = 1545mm=1.545m. Therefore, the moment of wind load on the failure surface of the light pole is M = F×1.545.
According to the design maximum allowable wind speed of 27m/s, the basic load of a 2×30W dual-cap solar street light battery panel is 730N. Considering the safety factor of 1.3, F = 1.3×730 = 949N.
Therefore, M = F×1.545 = 949×1.545 = 1466N.m.
According to mathematical derivation, the resistance moment of the circular failure surface W = π×(3r2δ+3rδ2+δ3).
In the above formula, r is the inner diameter of the ring, and δ is the width of the ring.
Moment of resistance to failure surface W = π×(3r2δ+3rδ2+δ3)
=π×(3×842×4+3×84×42+43)= 88768mm3
=88.768×10－6 m3
The stress caused by the moment of wind load on the failure surface = M/W
= 1466/(88.768×10-6) =16.5×106pa =16.5 Mpa<<215Mpa
Among them, 215 Mpa is the bending strength of Q235 steel.
Therefore, the welding seam width designed and selected by the solar street light manufacturer meets the requirements. As long as the welding quality of the integrated solar street light can be guaranteed, the wind resistance of the light pole is no problem.
