Calculated Used Bar size Cb + Ktr Spacing Spacing 3" + Сь Vs la & area #5 (0.31in²) dp S S 12 x 0.31 0.70 = 5.314" 5" 3.3125 2.5 0.8 15.21" = 2 x 2.5" #6 (0.44in²) #7 (0.60in²) #8 (0.79in²) (2) Repeat your selection using the ACI 318-19 Table 25.4.2.3. Use the top line in this ACI318-19 table if the conditions allow. Note: again table will help. Example of table is shown below: #4 dp la #5 #6 #7 #8 #9 #10 4. A strip footing is basically a one-way slab loaded by an (assumed) uniform foundation pressure. f=3.5 ksi, normal weight, fy epoxy coated. = 60 ksi, bars are not = Flexural analysis/design shows that the needed A₁ = 0.70 in²/ft. This could be met by #6 bar (0.44 in²) at 71½" or by #5, #7, #8 etc. bars at appropriate spacing. Now it turns out that bars must be chosen with la≤ 27-3 24" as shown 2710 -27|| →3"clear at ends 3"clear Eld (1) Find maximum bar size permitted and its spacing if ACI 318-22 Equation (25.4.2.4a) is used (Note: no stirrup in one-way slab) Note: Try to list a table will help you find your final answer. Example of table is shown below: Page 1

Calculated Used Bar size Cb + Ktr Spacing Spacing 3" + Сь Vs la & area #5 (0.31in²) dp S S 12 x 0.31 0.70 = 5.314" 5" 3.3125 2.5 0.8 15.21" = 2 x 2.5" #6 (0.44in²) #7 (0.60in²) #8 (0.79in²) (2) Repeat your selection using the ACI 318-19 Table 25.4.2.3. Use the top line in this ACI318-19 table if the conditions allow. Note: again table will help. Example of table is shown below: #4 dp la #5 #6 #7 #8 #9 #10 4. A strip footing is basically a one-way slab loaded by an (assumed) uniform foundation pressure. f=3.5 ksi, normal weight, fy epoxy coated. = 60 ksi, bars are not = Flexural analysis/design shows that the needed A₁ = 0.70 in²/ft. This could be met by #6 bar (0.44 in²) at 71½" or by #5, #7, #8 etc. bars at appropriate spacing. Now it turns out that bars must be chosen with la≤ 27-3 24" as shown 2710 -27|| →3"clear at ends 3"clear Eld (1) Find maximum bar size permitted and its spacing if ACI 318-22 Equation (25.4.2.4a) is used (Note: no stirrup in one-way slab) Note: Try to list a table will help you find your final answer. Example of table is shown below: Page 1

Principles of Foundation Engineering (MindTap Course List)

9th Edition

ISBN:9781337705028

Author:Braja M. Das, Nagaratnam Sivakugan

Publisher:Braja M. Das, Nagaratnam Sivakugan

Chapter11: Load And Resistance Factor Design (lrfd)

Section: Chapter Questions

Problem 11.2P: Repeat Problem 11.1 based on limit state design, using the factors given in Table 11.4. 11.1 A...

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A footing supporting a 2 ft x 2 ft column load carring 550 kips (dead load) and 200 kips (live load). The foundation level is 5 ft below the ground surface. The gross allowable bearing capacity is 6 ksf. The unit of soil is 130 pcf. You are required to provide complete design calculations for bearing, shear, and flexure for the strip footing. Assume f' = 4 ksi, fy = 60 ksi.