4.3　Steel Pole

4.3.1　The steel pole may be calculated based on cantilever bending member，and the secondary effect caused by vertical load due to member deformation shall be also taken into account.

4.3.2　The horizontal wind load of cone shaped steep pole may be calculated by section.The wind load at central altitude is taken as the average wind load of such section.The number of sections of whole tower shall not be less than 5.

4.3.3　The horizontal vibration effect perpendicular to wind direction caused by fluctuating wind shall be calculated providing the outer wall slope of cone shaped steel pole is less than 2%.

4.3.4　The height of steel pole shall not be more than 50m.If not，appropriate vibration control technologies should be taken to reduce the structural deformation.