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DESIGN CALCULATIONS Ref. No. TQDC 2013‐1
Date: 17 March 2013
ROUGH CALCULATIONS CHECK FOR LIGHT POLE FOUNDATION: 1. This calculation is based on a 22m high pole with 750mm dia. base shown in Dwg. 5089236/008/SL/1313. Top diameter of tapered of tapered circular pole is assumed as 250mm for purposes of calculating of calculating projected area. Other pole configurations with equivalent projected area may be used. 2. Resultant wind forces on elements, fixtures and fixings on the pole are approximate in the absence of specific data on effective projected areas (EPAs) from the pole and fixtures manufacturer. 2
OVERTURNING MOMENT: M = P1(7.33) + P2(6.2) + P3(12) + P4(20) M = 140 KNm FACTORED MOMENT: MF =
279 KNm
(considering a factor of safety of 2)
SHEAR LOAD AT THE BASE: V = 17.5 KN FACTORED SHEAR VF =
35 KN
(considering a factor of safety of 2)
MOMENT TO SHEAR RATIO: H = MF/VF H=
7.98 m
COEFFICIENT q: = V /9cD
where: 2
c = shear strength of soil (KN/m ) c = 492
q = 0.005 m
D = width or diameter of foundation (m) D = 1.5 BY BROMS' DESIGN METHOD:
REQUIRED EMBEDMENT DEPTH: 4H + 6D L = 1.5D + q 1 + 2 + q 2.72 m
< 3m (OK!)
CHECK ALLOWABLE MAXIMUM MOMENT: MFmax = VF ( H + 1.5D + 0.5q) MFmax =
358 KNm
>
279 KNm (OK!)
BASED ON THE ABOVE ROUGH CALCULATIONS, DIA. 1.5m x 3m DEEP AUGER PILE FOUNDATION FOR 22m HIGH LIGHT MAST IS ADEQUATE. A MORE DETAILED DESIGN SHALL BE CARRIED OUT BY THE DESIGN ENGINEER BASED ON SPECIFIC DESIGN DATA I.E., EPAs, SOIL & FOUNDATION CHARACTERISTICS AND ALL PROJECT REQUIREMENTS.
