Assume a rectangular section with b=8in and d=12in, subjected to a positive moment greater than the...
Assume a rectangular section with b=8in and d=12in, subjected to a positive moment greater than the cracking moment. For concrete with specified compressive strength of 4,000psi and steel Grade 60, what is the area of tensile steel that will move the neutral axis as far as possible down (towards the tensile steel side) per ACI.
A. 5.525 in^2
B. 2.736 in^2
C. 1.978 in^2
D. 0.3168 in^2
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Assume a rectangular section with b=8in and d=12in, subjected to
a positive moment greater than the...
2.736 in 2 Incorrect 0/1 pts Question 6 Assume a rectangular section with b=8in and d=12in,...
2.736 in 2 Incorrect 0/1 pts Question 6 Assume a rectangular section with b=8in and d=12in, subjected to a positive moment greater than the cracking moment. For concrete with specified compressive strength of 4,000psi and steel Grade 60,what is the area of tensile steel that will move the neutral axis as far as possible down (towards the tensile steel side) per ACI. 5.525 in2 • 2.736 in2 1.978 in2 0.3168 in2 Question 7 1/1 pts
2. A rectangular beam, 400 x 600 mm gross dimension, is cast using a concrete strength...
2. A rectangular beam, 400 x 600 mm gross dimension, is cast using a concrete strength of fc 30 MPa, reinforced with 5-25 mm diameter steel bar at the effective depth of 500 mm. If is subjected to a moment, M 130 kN-m. Determine the following: Magnitude of the bending moment that cracks the singly-reinforced beam section. (10 pts) b. For the computed cracking moment, determine the maximum compressive stress in the concrete and the stress in the tension steel....
27.2 Much as in Exercise 27.1, a rectangular steel-reinforced concrete beam supports a uni- formly distributed...
27.2 Much as in Exercise 27.1, a rectangular steel-reinforced concrete beam supports a uni- formly distributed load of 4.5 kip/ft (including the beam weight) for a span of 28 ft. The breadth (b) of the beam is 16 in. The effective depth (d) of the beam section was rounded a compressive strength (f) of 4000 Ib/in2 and grade 60 steel for tensile and web reinforcement are specified. Six longitudinal tensile bars are to be used. Specify the gange number of...
Answer the following questions for each cross-section below using the Equivalent Rectangular Stress Block (Whitney Stress...
Answer the following questions for each cross-section below using the Equivalent Rectangular Stress Block (Whitney Stress Block) for compressive stresses in the concrete. (72 total points) A. What is the nominal moment capacity of the beam (Ma)? [6 points) B. What is the distance from the top of the beam to the neutral axis (c)? [2 points] C. Assuming the concrete reaches a strain of 0.003, what is the strain in the extreme tension layer of reinforcing steel? Draw the...
Cracking Moment (Uncracked Concrete Stage) Problem 1) Problem 2.6 (page 55, McCormac and Brown, gth Ed.)...
Cracking Moment (Uncracked Concrete Stage) Problem 1) Problem 2.6 (page 55, McCormac and Brown, gth Ed.) Note: Modify the total depth of the beam from 24" to 26" and the depth of the steel rebars from 21" to 23". Transformed Area Method (Concrete Cracked- Elastic Stresses Stage) Problem 2) Problem 2.13 (page 56, McCormac and Brown, 8th Ed.) Note: Make the following changes: Change fe to 5 ksi use the values and dimensions shown in the figure below 1) 2)...
Please answer in numerical order. 1. Use ρ-p0.004 and choose (you decide) the number (3 to...
Please answer in numerical order.
1. Use ρ-p0.004 and choose (you decide) the number (3 to 5) and size of steel bars from the attached table. Then proceed to determine (a) the size of the cross-sectional area, (b) the moment capacity of the RC section that you design, and (c) show where is the neutral axis on the diagram (or sketch a new one). 2.5" Given: fe 3,000 psi, fy -60,000 psi Concrete cracking strain 0.003 Initial yielding strain of...
A 15-ft solid concrete cantilever beam with a rectangular cross-section is shown below. It supports a...
A 15-ft solid concrete cantilever beam with a rectangular cross-section is shown below. It supports a load w = 2,150 lb/ft. The concrete has a tensile strength of 650 psi and a compressive strength of 6,000 psi. (a) Determine the maximum tensile and compressive stresses in the beam due to the applied load (b) Explain where failure would initiate in the solid concrete beam under the applied load. (c) Because the solid concrete beam is not adequate to carry the...
The point loads are placed at the fixed positions shown in the figure and they are...
The point loads are placed at the fixed positions shown in the figure and they are live loads. А B D E K 12 44 w * C (centre) A b f' = 32 Mpa far = 3 MPa fs, = 500 MPa E = 200 GP E = 28600 MPa A a Cross section The following values are used for the question. • 3 m load before cracking • h = 2.5 m • P=2 KN • a =...
The point loads are placed at the fixed positions shown in the figure and they are...
The point loads are placed at the fixed positions shown in the figure and they are live loads. А B D E K 12 44 w * C (centre) A b f' = 32 Mpa far = 3 MPa fs, = 500 MPa E = 200 GP E = 28600 MPa A a Cross section The following values are used for the question. • 3 m load before cracking • h = 2.5 m • P=2 KN • a =...
The point loads are placed at the fixed positions shown in the figure and they are...
The point loads are placed at the fixed positions shown in the figure and they are live loads. А B D E K 12 44 w * C (centre) A b f' = 32 Mpa far = 3 MPa fs, = 500 MPa E = 200 GP E = 28600 MPa A a Cross section The following values are used for the question. • 3 m load before cracking • h = 2.5 m • P=2 KN • a =...
2.736 in 2 Incorrect 0/1 pts Question 6 Assume a rectangular section with b=8in and d=12in, subjected to a positive moment greater than the cracking moment. For concrete with specified compressive strength of 4,000psi and steel Grade 60,what is the area of tensile steel that will move the neutral axis as far as possible down (towards the tensile steel side) per ACI. 5.525 in2 • 2.736 in2 1.978 in2 0.3168 in2 Question 7 1/1 pts
2. A rectangular beam, 400 x 600 mm gross dimension, is cast using a concrete strength of fc 30 MPa, reinforced with 5-25 mm diameter steel bar at the effective depth of 500 mm. If is subjected to a moment, M 130 kN-m. Determine the following: Magnitude of the bending moment that cracks the singly-reinforced beam section. (10 pts) b. For the computed cracking moment, determine the maximum compressive stress in the concrete and the stress in the tension steel....
27.2 Much as in Exercise 27.1, a rectangular steel-reinforced concrete beam supports a uni- formly distributed load of 4.5 kip/ft (including the beam weight) for a span of 28 ft. The breadth (b) of the beam is 16 in. The effective depth (d) of the beam section was rounded a compressive strength (f) of 4000 Ib/in2 and grade 60 steel for tensile and web reinforcement are specified. Six longitudinal tensile bars are to be used. Specify the gange number of...
Answer the following questions for each cross-section below using the Equivalent Rectangular Stress Block (Whitney Stress Block) for compressive stresses in the concrete. (72 total points) A. What is the nominal moment capacity of the beam (Ma)? [6 points) B. What is the distance from the top of the beam to the neutral axis (c)? [2 points] C. Assuming the concrete reaches a strain of 0.003, what is the strain in the extreme tension layer of reinforcing steel? Draw the...
Cracking Moment (Uncracked Concrete Stage) Problem 1) Problem 2.6 (page 55, McCormac and Brown, gth Ed.) Note: Modify the total depth of the beam from 24" to 26" and the depth of the steel rebars from 21" to 23". Transformed Area Method (Concrete Cracked- Elastic Stresses Stage) Problem 2) Problem 2.13 (page 56, McCormac and Brown, 8th Ed.) Note: Make the following changes: Change fe to 5 ksi use the values and dimensions shown in the figure below 1) 2)...
Please answer in numerical order.
1. Use ρ-p0.004 and choose (you decide) the number (3 to 5) and size of steel bars from the attached table. Then proceed to determine (a) the size of the cross-sectional area, (b) the moment capacity of the RC section that you design, and (c) show where is the neutral axis on the diagram (or sketch a new one). 2.5" Given: fe 3,000 psi, fy -60,000 psi Concrete cracking strain 0.003 Initial yielding strain of...
A 15-ft solid concrete cantilever beam with a rectangular cross-section is shown below. It supports a load w = 2,150 lb/ft. The concrete has a tensile strength of 650 psi and a compressive strength of 6,000 psi. (a) Determine the maximum tensile and compressive stresses in the beam due to the applied load (b) Explain where failure would initiate in the solid concrete beam under the applied load. (c) Because the solid concrete beam is not adequate to carry the...
The point loads are placed at the fixed positions shown in the figure and they are live loads. А B D E K 12 44 w * C (centre) A b f' = 32 Mpa far = 3 MPa fs, = 500 MPa E = 200 GP E = 28600 MPa A a Cross section The following values are used for the question. • 3 m load before cracking • h = 2.5 m • P=2 KN • a =...
The point loads are placed at the fixed positions shown in the figure and they are live loads. А B D E K 12 44 w * C (centre) A b f' = 32 Mpa far = 3 MPa fs, = 500 MPa E = 200 GP E = 28600 MPa A a Cross section The following values are used for the question. • 3 m load before cracking • h = 2.5 m • P=2 KN • a =...
The point loads are placed at the fixed positions shown in the figure and they are live loads. А B D E K 12 44 w * C (centre) A b f' = 32 Mpa far = 3 MPa fs, = 500 MPa E = 200 GP E = 28600 MPa A a Cross section The following values are used for the question. • 3 m load before cracking • h = 2.5 m • P=2 KN • a =...
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