Foundation Design: Principles and Practices (3rd Edition)
3rd Edition
ISBN: 9780133411898
Author: Donald P. Coduto, William A. Kitch, Man-chu Ronald Yeung
Publisher: PEARSON
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Chapter 7, Problem 7.21QPP
Repeat Problem 7.20 using LRFD assuming the factored ultimate vertical column load is 560 k.
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PROBLEM 1.
Calculate the uniform live load capacity of the reinforced concrete beam in Figure 1 if f.'=20.7 MPa and
f, = 276 MPa. The beam also carries a dead load (including the beam weight) equal to 680 N/m.
b= 250mm
Wu
d= 460 mm
L= 6 m
3-25mm o bars
Beam Section
Figure 1
Determine the largest axial load P that can be safely supported
by a flat steel bar consisting of two portions, both 10 mm thick
and, respectively, 40 and 60 mm wide, connected by fillets of
radius r 5 8 mm. Assume an allowable normal stress of 165
MPа.
The intensity of load effect on the structure is based on
A. Load factor
B. Load effect
C. Return period
C. All answer are wrong
Chapter 7 Solutions
Foundation Design: Principles and Practices (3rd Edition)
Ch. 7 - List the three types of bearing capacity failures...Ch. 7 - A 1.2 m square, 0.4 m deep spread footing is...Ch. 7 - A 5 ft wide, 8 ft long, 2 ft deep spread footing...Ch. 7 - A column carrying a vertical downward unfactored...Ch. 7 - A column carrying a vertical downward ultimate...Ch. 7 - A 120 ft diameter cylindrical tank with an empty...Ch. 7 - A 1.5 m wide, 2.5 m long, 0.5 m deep spread...Ch. 7 - A 5 ft wide, 8 ft long, 2 ft deep spread footing...Ch. 7 - A bearing wall carries a total unfactored load 220...Ch. 7 - After the footing in Problem 7.9 was built, the...
Ch. 7 - A bearing wall carries a factored ultimate...Ch. 7 - A 5 ft wide, 8 ft long, 3 ft deep footing supports...Ch. 7 - Prob. 7.13QPPCh. 7 - A spread footing supported on a sandy soil has...Ch. 7 - A certain column carries a vertical downward load...Ch. 7 - A building column carries a factored ultimate...Ch. 7 - A 3 ft square footing is founded at a depth of 2.5...Ch. 7 - A building column carries factored ultimate loads...Ch. 7 - Develop a spread sheet to compute allowable total...Ch. 7 - A certain column carries a vertical downward load...Ch. 7 - Repeat Problem 7.20 using LRFD assuming the...Ch. 7 - Conduct a bearing capacity analysis on the Fargo...Ch. 7 - Three columns, A, B, and C, are collinear, 500 mm...Ch. 7 - Two columns, A and B, are to be built 6 ft 0 in...Ch. 7 - In May 1970, a 70 ft tall, 20 ft diameter concrete...
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- A floor slab 100 mm thick is cast monolithically with beams 300 mm wide 500 mm deep spaced 2 m on centers, on simple supports over a span of 6.0 m. The floor supports a superimposed service dead load of 1.77 kPa and service live load of 4.8 kPa. Using f’c = 21 MPa, long bar fy = 415 MPa, calculate: 7. Factored uniform load on a typical interior beam using load factors of 1.2 for dead load and 1.6 for live load. = [wu] kN/m (2 decimal places)arrow_forwardExample The compressive gravity axial load for a building column are: L = 300 k, D = 150 k and L₁ = 60 k. The compressive axial force in the column due to other loads are: wind= 70 k, seismic = 50 k. Tensile axial force in the column due to other loads are: wind = 60 k, seismic = 40 k. Determine the critical design loads based on the AISC load combinations. Compressive loads are positive (this is an arbitrary choice). Homework 1: Write the load combinations and find the max. and min. loads applied to the column for each of the LRFD method and ASD methodarrow_forwardThe figure below shows a concrete structure (concrete pit) of a canal. Calculate (a) the factor of safety against uplift at the base of the concrete pit (b) the effective stress at the base of the concrete pit. Do the above required calculations for the following two cases: - If the water table is at level (1). - If the water table is at level (2). Hint: [State weather the design is good or not for the above two cases] concrete 24 kN/m² (1) ground level 3.50 5.0 m very long concrete pit Base of concrete pit- (2) T 2.85 1.0 2.0 1.0 3.0 3.0marrow_forward
- The figure below shows a concrete structure (concrete pit) of a canal. Calculate (a) the factor of safety against uplift at the base of the concrete pit (b) the effective stress at the base of the concrete pit. Do the above required calculations for the following two cases: - If the water table is at level (1). -If the water table is at level (2). Hint: [State weather the design is good or not for the above two cases] concrete-24 kN/m² (1) (2) ground level 0.75 3.50 5.0 m very long concrete pit Base of concrete pit- (2) (1) 2.85 1.0 2.0 1.0 3,0 3.0 marrow_forward02/1 For the simply supported reinforced concrete one-way solid slab as shown below. Find the maximum live load can be carry by this slab. Assume: f = 25 MPa and fy = 420 MPa and y=24kN/m'. 200mm Ø 10mm@200 mm 012mm@200mm Fig.2 4marrow_forwardA rectangular 230 mm 350 mm beam is (effective depth). The factored shear force acting at a section is 80 KN. If the permissible shear stress in concrete in 0.25 MPa.. the design shear force is nearlyarrow_forward
- Problem 4.39 Design the one-way slab shown in the accompanying figure to support a live load of 10 kN/m2. Do not use the ACI thickness limitation for deflections. Assume concrete weighs 23.5 kN/m.f 28 MPa and f, = 420 MPa. Use p = Pmur: (One ans. 240-mm slab with #25 @ 140-mm main steel) -10m Width of the slab is 10m WL = 10kN/m2 And draw slab section showing all reinforcements along with the slabarrow_forwardSITUATION 1: A 250 mm wide rectangular concrete beam is reinforced for tension only. The beam has an effective depth of 300 mm. fc' = 9.3 MPa, fs = 138 MPa, n = 9. Use working stress design for balanced %3D condition. 1. Which of the following most nearly gives the value of k. a. 0.3225 c. 0.6234 b. 0.3526 d. 0.3775 2. Which of the following most nearly gives the value of j. a. 0.7482 c. 0.8742 b. 0.8472 d. 0.4278 3. Which of the following most nearly gives the balanced moment capacity of the beam in kN.m. a. 34.52 C. 36.7 b. 45.36 d. 32.3arrow_forwardA simply supported concrete beam 6m long is reinforce with four-28 mm diamgram tension bars. The beam has a width of 300mm and over all depth of 400.the steel covering to the centroid of the renforcement is 70 mm fc=30mpa and fy 418mpa A .draw a stress diagram B.compute for the ultimate capacity of the beamarrow_forward
- Situation 5. A floor slab 100 mm thick is cast monolithically with beams 300 mm wide 500 mm deep spaced 1.5 m on centers, on simple supports over a span of 6.0 m. The floor supports a superimposed service dead load of 1.77 kPa and service live load of 4.8 kPa. Using f'c 21 MPa, long bar fy = 415 MPa, calculate: 12. Factored uniform load on a typical interior beam in kN/m using load factors of 1.2 for dead load and 1.6 for live load. A. 18.68 B. 17.35 A. 1,800 B. 1,500 C. D. 13. Using a T-beam geometry formed from monolithic construction, determine the effective flange width of a typical interior beam in mm. 22.48 25.78 A. 495 B. 560 C. 1,200 D. 1,900 14. Using a T-beam geometry, determine the required area in mm² of 16-mm-dia. flexure bars for maximum ultimate bending. C. D. 620 448arrow_forward2. A reinforced concrete beam having a width of 280 mm and a total depth of 600 mm isreinforced for tension at the bottom with 6 - 36 mmɸ bars placed on two layers, 4 bars onfirst layer and 2 bars on second layer. Compute the effective depth of the beam and theclear horizontal spacing between bars.arrow_forwardSituation 1: A concrete overhang beam with the section shown is to support a 150 mm thick concrete slab with a tributary width of 2.70 m. The beam also supports a 3.20 m height of 100 mm thick concrete partition wall. Unit weight of concrete is taken to be 24 kN/m³. Determine the dead load in kN per meter length of beam and determine the maximum fiber stresses (tensile & compressive) due to the imposed dead loads. Draw the complete V&M diagrams. 14 b1 300 mm b3 10.0m G1 120 mm 360 mm LIBRARY Situation 2: Shown below is a floor plan of the library, office and balcony at the second floor level of a condo unit. Use the floor live loads for the given areas: Library area, LL = 5.60 kPa; for Office, LL = 3.20 kPa; and for the Balcony, LL = 2.40 kPa. Determine the live load intensity and load condition to be applied on each member (b1,b2, b3, b4, b5, G1, G2, & G3. Determine also the internal shear and internal moment at the midspan of girder G2. BALCONY G2 G3 4.0m b2 b4 1.2 m FLOOR PLAN 8.0m…arrow_forward
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