Principles of Foundation Engineering, SI Edition
8th Edition
ISBN: 9781305723351
Author: Braja M. Das
Publisher: Cengage Learning US
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2. A 300 mm x 400 mm concrete beam has a span of 5.5m. A post tension force of 600 kN was
applied at a point 60mm above the bottom of the beam. Assume concrete would not crack in
tension. f.=20.7MPA. Unit weight of concrete is 23.5 kN/m3. Compute the following:
а.
Deflection due to prestressing force of 600 kN.
b.
Net deflection of the beam immediately after transfer.
60mm
5.5m
A rectangular footing 2.1 m x 3.6 m x 0.35 m thick supports a 300 mm square column at its center.
Column loads are service conditions:
DL = 346 kN
LL = 231 kN
f’c = 21 MPa
fy = 415 MPa
Concrete cover to the centroid of steel reinforcement = 100 mm
Calculate the nominal punching shear stress in the slab. Write your final answer with 2 decimal places if the unit is MPA.
Answer: 1.83
2nd: A simply supported 14-m span beam,
300-mm wide by 540-mm deep, is pre-
stressed by straight tendons with Aps = 774
mm² located 70 mm from the bottom at an
initial prestress of 1.10 GPa. Calculate the
concrete stress in MPa at the bottom fiber of
the beam at midspan immediately after the
tendons are cut. Write your answer in 2
decimal places only. Use unit weight of
concrete 24 kN/cu.m. Sign convention is (+)
tension, (-) compression. Indicate the sign in
your final answer.
Chapter 13 Solutions
Principles of Foundation Engineering, SI Edition
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- Determine if the concrete mass gravity wall shown below is safe by calculating factors of safety against sliding, overturning, and bearing capacity. Use the following in your analysis: H1 = 15 ft H2 = 3 ft Bi = 10 ft B2 = 3 ft Yconc = 150 pcf B = 15° Y = 130 pcf $= 35° 8 = 20° B2 • H2 B1arrow_forwardGiven the properties of a reinforced concrete beam with section below: Unit weight of concrete = 24 kN/m3 %3D • Concrete compressive strength = %3D 34.5 MPa Steel yield strength = 420 MPa %3D b = 250 mm ; width of the beam h = 500 mm ; depth of the beam %3D %3D Steel area = 4-28 mm o Diameter of stirrups 12 mm %3D Calculate the following: 1. Reduction factor o 2. Moment Capacity (nominal) of the beam in kN-m 3. Assuming the beam to be simply supported with 7 m span, determine the maximum concentrated dead load that it can carry at midspan along with it's self-weight in kNarrow_forwardA Reinforce concrete shear wall systems which lies in Seismic Zone 4 is shown in the figure below with the following properties: NA=1.052 CA=0.463 NV=1.304 CV=0.835 T=0.8 W=8, 500 kN Length of Each Shear Wall=5m Thickness of Shear Wall=0.3 m Quantity of Shear Wall=2 pcs 1. Determine the Total Design Base Shear V. Based on NSCP 2015. 2. Determine the Maximum Design Base Shear permitted by the code. Based on NSCP 2015.arrow_forward
- 29 A square footing 2.2 m x 0.39 m thick supports a 300 mm square column at its center. Column loads are service conditions: DL = 317 kN LL = 217 kN f’c = 21 MPa fy = 415 MPa Concrete cover to the centroid of steel reinforcement = 100 mm Calculate the nominal one way shear stress in the slab. Write your final answer with 2 decimal places if the unit is MPA.arrow_forward1- For the floor system shown in Figure below, support service live load 4KN / (m ^ 2) and service dead load 5KN / (m ^ 2) Answer the flowing. Classify the floor system into one way or two-way solid slab. 2- What is the minimun slab thickness that should be used to control deflection and shear requirement ? 3- By using Ø 12 mm rebar, what is the required positive and nagative reinforcement? 4- Sketch the detail of reinforcement. Use : fy = 400Mpa , f c ^ prime =30 Mpa 6.00 m 6.00 m6.00 m 3.00 m 0.30 m АB 3.00 m 3.00 marrow_forward30 A rectangular footing 2.3 m x 3.6 m x 0.38 m thick supports a 300 mm square column at its center. Column loads are service conditions: DL = 306 kN LL = 241 kN f’c = 21 MPa fy = 415 MPa Concrete cover to the centroid of steel reinforcement = 100 mm Calculate the nominal punching shear stress in the slab. Write your final answer with 2 decimal places if the unit is MPA.arrow_forward
- Determine the maximum live load that can be applied on one way slab shown in Fig. (1). The slab is reinforced with main reinforcement of $12@150 mm at top and bottom f = 25 MPa, fy = 400 MPa, Wa = slab weight + 40mm tiling Slabthickness = 180 mm All columns = 300*300 mm All beams = 300 * 600 mm 0.3 H 11 11 11 11 7m 11 11 10.3 3m = 0.3 3m 10.3 Fig.(1) 0.3 +Harrow_forwardRAarrow_forwardPROBLEM 1: The continuous floor beam ABCD is shown in the figure. It has a 100 mm slab thickness and the beams bxh is 300 mm x 500 mm. Column section is 0.30 m x 0.30 m. Live load = 3.6 KPa Superimposed Dead load = 2.6 KPa Concrete weighs = 24 KN/m3 L = 8 m. S = 2.8 m. 2.8 2.8 Siahs. neglet the live load Reduchon O Compute the positive moment for beam EF. 2.8 M 8 m 8 m 8 m Compute the negative moment at the face of support E Compute the negative moment at Farrow_forward
- 9.5- for the floor system shown below with assuming that service dead load 3 kN/m2, live load 4 kN/m?, Answer the following: 1- Classify the floor system into one way or two-way slab. 2- Check the proposed slab thickness according to deflection and shear requirement. 3- Check the proposed reinforcement at top and bottom in direction shown below. 4- What is the ultimate load transfer from slab and brick wall on beam AB? f = 28MPA, fy 400MP and y for brick wall = 17kN/m³ 5.20m 5.20 m A ø12@250 mm T opening 6.00m 012@200 mm B B 3.08 m 0.30 me 0.18m section A-Aarrow_forwardDesign of Shear (Assignment)arrow_forwarda rectangular footing 2.3 m x 3.3 m x 0.31 m thick supports a 300 mm square column at its center. column loads are service conditions:DL = 385 kN LL = 292 kN f'c = 21 MPa fy = 415 MPa Concrete cover to the centroid of steel reinforcement = 100 mm calculate the nominal punching shear stress in the slab. write your final answer with 2 decimal places if the unit is MPA.arrow_forward
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