Transmission And Substation Foundations - Technical Design Manual (TD06088E)

DESIGN EXAMPLE 9 INSTANT FOUNDATIONS® for STREET LIGHT SUPPORTS SYMBOLS USED IN THIS DESIGN EXAMPLE

SLF......................................................... STREET LIGHT FOUNDATION 7-46 DL.......................................................................DEAD OR DOWN LOAD 7-47 V.....................................HORIZONTAL OR LATERAL SHEAR LOAD 7-47 M.......................................................................................MOMENT LOADS 7-47 AASHTO................................ AMERICAN ASSOCIATION OF STATE 7-47 ..............................HIGHWAY AND TRANSPORTATION OFFICIALS L..................................................................................REQUIRED LENGTH 7-48 C..................................................................................COHESION OF SOIL 7-48 FS..............................................................................FACTOR OF SAFETY 7-48 V F ..................................................APPLIED SHEAR AT GROUNDLINE 7-48 .......................................................... INCLUDING FACTOR OF SAFETY V M ............................................ APPLIED MOMENT AT GROUNDLINE 7-48 .......................................................... INCLUDING FACTOR OF SAFETY D...............................................................DIAMETER OF FOUNDATION 7-48 q............................................................................ BROMS’ COEFFICIENT 7-48 M MAX ................ MAXIMUM MOMENT APPLIED TO FOUNDATION 7-48 φ .........................................................INTERNAL ANGLE OF FRICTION 7-49 γ ............................................................................ UNIT WEIGHT OF SOIL 7-49 K P ..................................PASSIVE EARTH PRESSURE COEFFICIENT 7-49

DESIGN EXAMPLES

Purpose This design example provides example solutions to aid in the selection of appropriate CHANCE ® Instant Foundation ® products for different job parameters. SLF Loads The resulting pole loads to be resisted by a street light foundation (SLF) are dead or vertical down loads (DL), horizontal, lateral or shear loads (V) due to wind on the pole and luminaire (light fixture), and over- turning moment loads (M) resulting from the tendency to bend at or near the ground line as the wind causes the pole to displace and the foundation restrains the pole base at one location (see Figure 7-30).

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