A rectangular beam of width b =12in., effective depth d = 20.5 in., and total de
ID: 1829098 • Letter: A
Question
A rectangular beam of width b=12in., effective depth d = 20.5 in., and total depth h= 23 in. spans 18.5 ft between simple supports. It will carry a computed deadload of 1.27 kips/ft including self-weight, plus a service live load of 2.44 kips/ft.Reinforcement consists of four No. 8 bars in one row. Material strengths are fy=60,000psi and f'c=4000psi.
(a) Calculate the increment of deflection resultingfrom the first application of the short-term live load.
(b) Find the creep portion of thesustained load deflection plus the immediate deflection due to live load.
Explanation / Answer
a
= 0.0103?
b
= 112.53 < 145 (ok)
Exterior exposure
Allowable crack width = 0.013 in > 0.01 in (OK)