p5 outdoor led display.Wind resistant design of street lamp poles

　　The parameters of street lights are as follows:

　　Battery panel inclination angle A=16o, lamp pole height=5m

　　Design and select the width of the weld seam at the bottom of the lamp pole δ = 4mm light pole bottom outer diameter=168mm

　　The surface where the weld seam is located is the damaged surface of the lamp pole. The distance from the calculation point P of the resistance moment W on the failure surface of the lamp pole to the line of action of the battery panel load F on the lamp pole is

　　PQ=[5000+(168+6)/tan16o] × Sin16o=1545mm=1.545m. So, the moment of action of wind load on the failure surface of the lamp pole M=F × 1.545.

　　Based on a design maximum allowable wind speed of 27m/s, 2 × The basic load of the 30W dual head Changsha photosynthetic solar street lamp panel is 730N. Considering a safety factor of 1.3, F=1.3 × 730=949N.

　　So, M=F × 1.545=949 × 1.545=1466N. m.

　　According to mathematical derivation, the resistance moment of the circular failure surface W=π × (3r2 δ+ 3r δ 2+ δ 3) .

　　In the above equation, r is the inner diameter of the ring, δ It is the width of the circle.

　　Resistance moment of failure surface W=π × (3r2 δ+ 3r δ 2+ δ 3)

　　=π × (3) × eight hundred and forty-two × 4+3 × eighty-four × 42+43)=88768m3

　　=88.768 × 10-6 m3

　　Stress caused by the moment of action 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.

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