PEin2010
Well-known member
Hi! I am giving the structural PM. I started looking at some of the depth problems today and realized I'm quite inexperienced on Masonry design. One question I have is:
For a concrete masonry wall with reinforcement, and a roof dead load, the question asks to calculate the maximum design moment (lb-ft/ft). The loads are given as roof dead load is 55 psf (includes the snow load) and the effective length contributing is 12 feet. P = 12x55 = 660 lb/ft. The wall is 8" concrete block reinforced with steel reinforcement. The solution cacluates an 'e' eccentricity value as 7.625/2 + 3.5 = 7.31 inches. So M = P x e. However I am not able to understand how and why they calculated 'e'? Any guidance is appreciated!
Thank you in advance!
For a concrete masonry wall with reinforcement, and a roof dead load, the question asks to calculate the maximum design moment (lb-ft/ft). The loads are given as roof dead load is 55 psf (includes the snow load) and the effective length contributing is 12 feet. P = 12x55 = 660 lb/ft. The wall is 8" concrete block reinforced with steel reinforcement. The solution cacluates an 'e' eccentricity value as 7.625/2 + 3.5 = 7.31 inches. So M = P x e. However I am not able to understand how and why they calculated 'e'? Any guidance is appreciated!
Thank you in advance!