ARMY TM 5-5420-212-10-1MARINE CORPS TM 08676A-10/1-1EXAMPLESINGLE STORY GIRDERDEAD WEIGHT = 0.91 kN/m (0.028 ton/ft)(1)From Table 3-1 item 1:Maximum allowable SHEAR for a single story girder is 189 kN. This occurs at RA.Maximum allowable MOMENT for a single story girder is 677 kNm. This occurs at C.Steps (2) and (3) below will find Wusing these two values, and the smallest calculated value for W willbe the maximum allowable load.(2)To find W using the SHEAR value:The maximum shear (189 kN) occurs at RA:Taking moments about RBRA x 18= Wx 12 + (18x 0.91) x9RA = 12/18W+ [(18 x 0.91) x 9]/18RA = 2/3W + 8.19from above RA = 189Therefore:2/3W+ 8.19 = 189Therefore:W= 271 kN (27.24 tons f)(3)To find W using the MOMENT value:The maximum bending moment (677 kNm) occurs at C.Taking moments about C:RA x 6 - (0.91 x 6) x 3 = 677from step (2) RA = 2/3W + 8.19Therefore:(2/3W+ 8.19)x 6 - (0.91 x 6) x 3 = 6774W + 49.14- 16.38 = 677Therefore:W=161kN(16tonsf)(4)Therefore the maximum load (W) that can be imposed on the single story girder in the position shown,and not exceed the maximum allowable shear (step 2) or the maximum bending moment (step 3), is161kN(16tonsf)3-3
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