The weight of a normal weight hollow concrete block wall that is 8\" thick solid
ID: 1710301 • Letter: T
Question
The weight of a normal weight hollow concrete block wall that is 8" thick solid grouted is _____ psf, and that is grouted @24" o.c. is _____ psf. Using #3 ties in a 16 times 24 masonry column with 4#7 vertical bars, the tie spacing should be _____ O.C., Show your work here. For interior columns, K_LL = ____, and for interior beams, K_LL = _____ The allowable tensile stress, F_s, for Grade 40 steel is ______ psi, and that for Grade 60 steel is ______ psi. The steel ratio, rho, in masonry column design should be between _____ and _____. One of the requirements for masonry column design is that H/t is less than _____ Which failure mode would that control? Explain The formula to calculate the moment at the base of a masonry cantilever retaining wall is _____.Explanation / Answer
14. The weight of a normal weight hollow concrete block wall that is 8" thick solid grouted is 84 psf, and that is grouted @24 o.c. is 61 psf
15.As per ACI 7.10.5.2 vertical spacing of ties should not exceed the smallest of
a)16 times longitudinal bar = 16*0.875 = 14 inch
b) 48 times die of tie = 48*0.375 =18 inch
c)Least lateral crosssectional dimension = 16 inch
So tie spacing should be 14 inch.
16. For interior columns KLL=4 and for interior beams KLL=2
17.Allowable tensile stress for Grade 40 steel is 20 ksi and Grade 60 steel is 24 psi
18.Minimum percentage of steel in masonry column is 1 % and maximum is 8% . Hence steel ratio must be between 1 and 8
19. The H/t raio of a masonry column must be less than 4 This is to ensure that the column does not undergo buckling.
20. We have two types of moments at the base of a cantilever retaining wall.a) Overturning Moments b)Resisiting Moments
Overturning moment is due to the horizontal component of the pressure due to backfill.
Mo = Ph x h/3
Resisting moment is due to the weight of the concrete and the vertical component of soil backfill.
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