In a simply supported concrete slab, at the point at which post-tenstioned prestressing cables in...
in a simply supported concrete slab, at the point at which post-tenstioned prestressing cables in a curved duct are tensioned in a factory, explain what happens to the concrete slab
Homework Answers
Post Tensioned Prestressing Cables
It is a simple process to produce prestressed concrete structures.The prestressed state produces an internal forces in the concrete structure construction process in order to counteract the effect of external forces when the structure is put into real world loads.
Effects of prestressing the concrete slabs
If a concrete slab is stressed by post tensioning method , that means that the steel in the structure is being tensioned and the concrete is under compressed state.Compression force crushes the structure while tension expands or pulls apart the structure.
Concrete preforms strong in compression but weak in tension , while steel performs strong in tension . So putting the concrete under compression and the steel under tension makes the materials in their strongest performing states and that makes the slab more stiff and offers more resistance to tensile forces.
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In a simply supported concrete slab, at the point at which post-tenstioned prestressing cables in...
A Class 1 post-tensioned rectangular concrete beam is simply supported over a 10 m span. The char...
A Class 1 post-tensioned rectangular concrete beam is simply supported over a 10 m span. The characteristic imposed load consists of a single 50 kN force at midspan. The characteristic concrete strength is 50 N/mm2 and the unit weight of concrete is 25 kN/m. The beam is of a uniform section (Fig. 5) having the following properties: b- 250 mm; h 500 mm. Assume the concrete strength at transfer is 40 N/mm2 and there is no prestressed loss. (1) Determine...
1. A post tensioned concrete beam, 100mm wide and 400mm deep is prestressed by three cables,...
1. A post tensioned concrete beam, 100mm wide and 400mm deep is prestressed by three cables, each with a cross sectional area of 50mm², initial stress of 1200N/mm². Calculate the stress in concrete at level of steel? 2. A pre tensioned concrete beam 100mm wide and 300mm deep, initial force of 150kN at an eccentricity of 50mm, moment of inertia is 225*10mm, initial stress in steel is 400N/mm², modular ratio is 8. Estimate the percentage loss? 3. A pretensioned concrete...
A 5 in thick simply supported reinforced concrete one-way slab is part of a roof system....
A 5 in thick simply supported
reinforced concrete one-way slab is part of a roof system. It is
supported by two masonry block walls, as shown below. Assume a
superimposed dead load (roofing, insulation, ceiling, etc.) of 15
psf and a roof live load of 30 psf. Check the adequacy of the slab,
including the required shrinkage and temperature reinforcement. Use
= 4,000 psi and = 60,000 psi.
1. A5 in thick simply supported reinforced concrete one-way slab is part...
The 5.5 in concrete slab (150 pcf density) is to be supported by W12X30 A992, Grade 50 simply supported steel beams spac...
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. A 5 in thick simply supported reinforced concrete one-way slab is part of a roof...
. A 5 in thick simply supported reinforced concrete one-way slab is part of a roof system. It is supported by two masonry block walls, as shown below. Assume a superimposed dead load (roofing, insulation, ceiling, etc.) of 15 psf and a roof live load of 30 psf. Check the adequacy of the slab, including the required shrinkage and temperature reinforcement. Use た= 4,000 psi and fy = 60,000 psi. #4 @ 9 in. #4 @ 12 in. 6 in...
1. A post tensioned concrete beam, 100mm wide and 400mm deep is prestressed by three cables,...
1. A post tensioned concrete beam, 100mm wide and 400mm deep is prestressed by three cables, each with a cross sectional area of 50mm², initial stress of 1200N/mm². Calculate the stress in concrete at level of steel? 2. A pre tensioned concrete beam 100mm wide and 300mm deep, initial force of 150kN at an eccentricity of 50mm, moment of inertia is 225x10mm, initial stress in steel is 400N/mm², modular ratio is 8. Estimate the percentage loss?
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You are given the task of checking the adequacy of a simply supported slab of 10-inch...
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Below is a diagram of a beam that is simply supported and subjected to a point load over a 9.8 in...
Below is a diagram of a beam that is simply supported and
subjected to a point load over a 9.8 in. plate. The member has 6.14
sq.-in. of flexural tension steel. You can use d = 25.7 in., bw =
bv = 3.54 in., f’c = 12.2 ksi, fy = 87 ksi, Av = 0.157 sq.-in. at a
spacing s = 6.50 in., finally, the maximum course aggregate used in
the beams was 0.50 in. There is no axial load...
no please Problem (2): Given: As an engineer, you have been asked to design a reinforced concrete floor system consists of a 5-in concrete slab supported by T-beams of 24-ft spans. The T-beams a...
no
please
Problem (2): Given: As an engineer, you have been asked to design a reinforced concrete floor system consists of a 5-in concrete slab supported by T-beams of 24-ft spans. The T-beams are spaced 4 ft and bw (width of the beam part 15". Total height is 25 inches. If you try to find the steel required for T-beam for moment due to Mp- 500 ft-kips and M-300 ft-kips, what would be the type of T-Beam (Regular or True...
A Class 1 post-tensioned rectangular concrete beam is simply supported over a 10 m span. The characteristic imposed load consists of a single 50 kN force at midspan. The characteristic concrete strength is 50 N/mm2 and the unit weight of concrete is 25 kN/m. The beam is of a uniform section (Fig. 5) having the following properties: b- 250 mm; h 500 mm. Assume the concrete strength at transfer is 40 N/mm2 and there is no prestressed loss. (1) Determine...
1. A post tensioned concrete beam, 100mm wide and 400mm deep is prestressed by three cables, each with a cross sectional area of 50mm², initial stress of 1200N/mm². Calculate the stress in concrete at level of steel? 2. A pre tensioned concrete beam 100mm wide and 300mm deep, initial force of 150kN at an eccentricity of 50mm, moment of inertia is 225*10mm, initial stress in steel is 400N/mm², modular ratio is 8. Estimate the percentage loss? 3. A pretensioned concrete...
A 5 in thick simply supported
reinforced concrete one-way slab is part of a roof system. It is
supported by two masonry block walls, as shown below. Assume a
superimposed dead load (roofing, insulation, ceiling, etc.) of 15
psf and a roof live load of 30 psf. Check the adequacy of the slab,
including the required shrinkage and temperature reinforcement. Use
= 4,000 psi and = 60,000 psi.
1. A5 in thick simply supported reinforced concrete one-way slab is part...
. A 5 in thick simply supported reinforced concrete one-way slab is part of a roof system. It is supported by two masonry block walls, as shown below. Assume a superimposed dead load (roofing, insulation, ceiling, etc.) of 15 psf and a roof live load of 30 psf. Check the adequacy of the slab, including the required shrinkage and temperature reinforcement. Use た= 4,000 psi and fy = 60,000 psi. #4 @ 9 in. #4 @ 12 in. 6 in...
1. A post tensioned concrete beam, 100mm wide and 400mm deep is prestressed by three cables, each with a cross sectional area of 50mm², initial stress of 1200N/mm². Calculate the stress in concrete at level of steel? 2. A pre tensioned concrete beam 100mm wide and 300mm deep, initial force of 150kN at an eccentricity of 50mm, moment of inertia is 225x10mm, initial stress in steel is 400N/mm², modular ratio is 8. Estimate the percentage loss?
2-You are given the task of designing a simply supported one-way slab, with a 13 feet span. The slab supports a live load of 200 psf. Use fc=3,000 psi, fy=60,000 psi. Provide a sketch of your design. 1 - Provide three (3) provisions about bar choosing/placing in concrete slabs, which you would need to consider as a structural engineer. Discuss the rationale behind each item. 2- You are given the task of designing a simply supported one-way slab, with a...
Below is a diagram of a beam that is simply supported and
subjected to a point load over a 9.8 in. plate. The member has 6.14
sq.-in. of flexural tension steel. You can use d = 25.7 in., bw =
bv = 3.54 in., f’c = 12.2 ksi, fy = 87 ksi, Av = 0.157 sq.-in. at a
spacing s = 6.50 in., finally, the maximum course aggregate used in
the beams was 0.50 in. There is no axial load...
no
please
Problem (2): Given: As an engineer, you have been asked to design a reinforced concrete floor system consists of a 5-in concrete slab supported by T-beams of 24-ft spans. The T-beams are spaced 4 ft and bw (width of the beam part 15". Total height is 25 inches. If you try to find the steel required for T-beam for moment due to Mp- 500 ft-kips and M-300 ft-kips, what would be the type of T-Beam (Regular or True...
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