A pretensioned, prestressed concrete girder is to be built, with the same span and cross section as the girder in the example of Section 6.10. Pretensioning will be applied using twelve 0.5 -in. diameter stress-relieved Grade 270 strands, six of which are (2024)

Design of Prestressed Concrete Arthur H. Nilson 2nd Edition

Chapter 6, Problem 1

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    Problem 1 The beam shown in Fig. P6.2, of 70 -ft span, is p…

    A pretensioned, prestressed concrete girder is to be built, with the same span and cross section as the girder in the example of Section 6.10. Pretensioning will be applied using twelve 0.5 -in. diameter stress-relieved Grade 270 strands, six of which are deflected upward at the one-quarter points of the span, to have zero eccentricity at the supports, the remainder being straight strands. The jacking force is 300,000 lb. Slip losses are fully compensated by overjacking, and friction at the tendon deflection points is negligible. Compute all losses, and express each as a percentage of the initial prestress fp i at midspan. Calculate the effectiveness ratio R. Compare the sum of losses due to elastic shortening, creep, shrinkage, and relaxation with the AASHTO recommended loss of Table 6.1. High early-strength concrete will be used, with fc^'=5,000 psi. Steam-curing will be utilized, and prestress force will be transferred to the girder at age three days, when fc^'=3,500 psi. | Numerade (2)

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    A pretensioned, prestressed concrete girder is to be built, with the same span and cross section as the girder in the example of Section 6.10. Pretensioning will be applied using twelve 0.5 -in. diameter stress-relieved Grade 270 strands, six of which are deflected upward at the one-quarter points of the span, to have zero eccentricity at the supports, the remainder being straight strands. The jacking force is $300,000 \mathrm{lb}$. Slip losses are fully compensated by overjacking, and friction at the tendon deflection points is negligible. Compute all losses, and express each as a percentage of the initial prestress $f_{p i}$ at midspan. Calculate the effectiveness ratio $R$. Compare the sum of losses due to elastic shortening, creep, shrinkage, and relaxation with the AASHTO recommended loss of Table 6.1. High early-strength concrete will be used, with $f_c^{\prime}=5,000$ psi. Steam-curing will be utilized, and prestress force will be transferred to the girder at age three days, when $f_c^{\prime}=3,500 \mathrm{psi}$.

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    A pretensioned, prestressed concrete girder is to be built, with the same span and cross section as the girder in the example of Section 6.10. Pretensioning will be applied using twelve 0.5 -in. diameter stress-relieved Grade 270 strands, six of which are deflected upward at the one-quarter points of the span, to have zero eccentricity at the supports, the remainder being straight strands. The jacking force is 300,000 lb. Slip losses are fully compensated by overjacking, and friction at the tendon deflection points is negligible. Compute all losses, and express each as a percentage of the initial prestress fp i at midspan. Calculate the effectiveness ratio R. Compare the sum of losses due to elastic shortening, creep, shrinkage, and relaxation with the AASHTO recommended loss of Table 6.1. High early-strength concrete will be used, with fc^'=5,000 psi. Steam-curing will be utilized, and prestress force will be transferred to the girder at age three days, when fc^'=3,500 psi. | Numerade (3) A pretensioned, prestressed concrete girder is to be built, with the same span and cross section as the girder in the example of Section 6.10. Pretensioning will be applied using twelve 0.5 -in. diameter stress-relieved Grade 270 strands, six of which are deflected upward at the one-quarter points of the span, to have zero eccentricity at the supports, the remainder being straight strands. The jacking force is 300,000 lb. Slip losses are fully compensated by overjacking, and friction at the tendon deflection points is negligible. Compute all losses, and express each as a percentage of the initial prestress fp i at midspan. Calculate the effectiveness ratio R. Compare the sum of losses due to elastic shortening, creep, shrinkage, and relaxation with the AASHTO recommended loss of Table 6.1. High early-strength concrete will be used, with fc^'=5,000 psi. Steam-curing will be utilized, and prestress force will be transferred to the girder at age three days, when fc^'=3,500 psi. | Numerade (4) A pretensioned, prestressed concrete girder is to be built, with the same span and cross section as the girder in the example of Section 6.10. Pretensioning will be applied using twelve 0.5 -in. diameter stress-relieved Grade 270 strands, six of which are deflected upward at the one-quarter points of the span, to have zero eccentricity at the supports, the remainder being straight strands. The jacking force is 300,000 lb. Slip losses are fully compensated by overjacking, and friction at the tendon deflection points is negligible. Compute all losses, and express each as a percentage of the initial prestress fp i at midspan. Calculate the effectiveness ratio R. Compare the sum of losses due to elastic shortening, creep, shrinkage, and relaxation with the AASHTO recommended loss of Table 6.1. High early-strength concrete will be used, with fc^'=5,000 psi. Steam-curing will be utilized, and prestress force will be transferred to the girder at age three days, when fc^'=3,500 psi. | Numerade (5)

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    A pretensioned, prestressed concrete girder is to be built, with the same span and cross section as the girder in the example of Section 6.10. Pretensioning will be applied using twelve 0.5 -in. diameter stress-relieved Grade 270 strands, six of which are deflected upward at the one-quarter points of the span, to have zero eccentricity at the supports, the remainder being straight strands. The jacking force is 300,000 lb. Slip losses are fully compensated by overjacking, and friction at the tendon deflection points is negligible. Compute all losses, and express each as a percentage of the initial prestress fp i at midspan. Calculate the effectiveness ratio R. Compare the sum of losses due to elastic shortening, creep, shrinkage, and relaxation with the AASHTO recommended loss of Table 6.1. High early-strength concrete will be used, with fc^'=5,000 psi. Steam-curing will be utilized, and prestress force will be transferred to the girder at age three days, when fc^'=3,500 psi. | Numerade (6)

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    A pretensioned, prestressed concrete girder is to be built, with the same span and cross section as the girder in the example of Section 6.10. Pretensioning will be applied using twelve 0.5 -in. diameter stress-relieved Grade 270 strands, six of which are deflected upward at the one-quarter points of the span, to have zero eccentricity at the supports, the remainder being straight strands. The jacking force is 300,000 lb. Slip losses are fully compensated by overjacking, and friction at the tendon deflection points is negligible. Compute all losses, and express each as a percentage of the initial prestress fp i at midspan. Calculate the effectiveness ratio R. Compare the sum of losses due to elastic shortening, creep, shrinkage, and relaxation with the AASHTO recommended loss of Table 6.1. High early-strength concrete will be used, with fc^'=5,000 psi. Steam-curing will be utilized, and prestress force will be transferred to the girder at age three days, when fc^'=3,500 psi. | Numerade (7)

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    A pretensioned, prestressed concrete girder is to be built, with the same span and cross section as the girder in the example of Section 6.10. Pretensioning will be applied using twelve 0.5 -in. diameter stress-relieved Grade 270 strands, six of which are deflected upward at the one-quarter points of the span, to have zero eccentricity at the supports, the remainder being straight strands. The jacking force is $300,000 \mathrm{lb}$. Slip losses are fully compensated by overjacking, and friction at the tendon deflection points is negligible. Compute all losses, and express each as a percentage of the initial prestress $f_{p i}$ at midspan. Calculate the effectiveness ratio $R$. Compare the sum of losses due to elastic shortening, creep, shrinkage, and relaxation with the AASHTO recommended loss of Table 6.1. High early-strength concrete will be used, with $f_c^{\prime}=5,000$ psi. Steam-curing will be utilized, and prestress force will be transferred to the girder at age three days, when $f_c^{\prime}=3,500 \mathrm{psi}$.

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    A pretensioned, prestressed concrete girder is to be built, with the same span and cross section as the girder in the example of Section 6.10. Pretensioning will be applied using twelve 0.5 -in. diameter stress-relieved Grade 270 strands, six of which are deflected upward at the one-quarter points of the span, to have zero eccentricity at the supports, the remainder being straight strands. The jacking force is 300,000 lb. Slip losses are fully compensated by overjacking, and friction at the tendon deflection points is negligible. Compute all losses, and express each as a percentage of the initial prestress fp i at midspan. Calculate the effectiveness ratio R. Compare the sum of losses due to elastic shortening, creep, shrinkage, and relaxation with the AASHTO recommended loss of Table 6.1. High early-strength concrete will be used, with fc^'=5,000 psi. Steam-curing will be utilized, and prestress force will be transferred to the girder at age three days, when fc^'=3,500 psi. | Numerade (8)

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    A pretensioned, prestressed concrete girder is to be built, with the same span and cross section as the girder in the example of Section 6.10. Pretensioning will be applied using twelve 0.5 -in. diameter stress-relieved Grade 270 strands, six of which are deflected upward at the one-quarter points of the span, to have zero eccentricity at the supports, the remainder being straight strands. The jacking force is 300,000 lb. Slip losses are fully compensated by overjacking, and friction at the tendon deflection points is negligible. Compute all losses, and express each as a percentage of the initial prestress fp i at midspan. Calculate the effectiveness ratio R. Compare the sum of losses due to elastic shortening, creep, shrinkage, and relaxation with the AASHTO recommended loss of Table 6.1. High early-strength concrete will be used, with fc^'=5,000 psi. Steam-curing will be utilized, and prestress force will be transferred to the girder at age three days, when fc^'=3,500 psi. | Numerade (9)

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    A pretensioned, prestressed concrete girder is to be built, with the same span and cross section as the girder in the example of Section 6.10. Pretensioning will be applied using twelve 0.5 -in. diameter stress-relieved Grade 270 strands, six of which are deflected upward at the one-quarter points of the span, to have zero eccentricity at the supports, the remainder being straight strands. The jacking force is 300,000 lb. Slip losses are fully compensated by overjacking, and friction at the tendon deflection points is negligible. Compute all losses, and express each as a percentage of the initial prestress fp i at midspan. Calculate the effectiveness ratio R. Compare the sum of losses due to elastic shortening, creep, shrinkage, and relaxation with the AASHTO recommended loss of Table 6.1. High early-strength concrete will be used, with fc^'=5,000 psi. Steam-curing will be utilized, and prestress force will be transferred to the girder at age three days, when fc^'=3,500 psi. | Numerade (10)Ace Chat

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    A pretensioned, prestressed concrete girder is to be built, with the same span and cross section as the girder in the example of Section 6.10. Pretensioning will be applied using twelve 0.5 -in. diameter stress-relieved Grade 270 strands, six of which are deflected upward at the one-quarter points of the span, to have zero eccentricity at the supports, the remainder being straight strands. The jacking force is 300,000 lb. Slip losses are fully compensated by overjacking, and friction at the tendon deflection points is negligible. Compute all losses, and express each as a percentage of the initial prestress fp i at midspan. Calculate the effectiveness ratio R. Compare the sum of losses due to elastic shortening, creep, shrinkage, and relaxation with the AASHTO recommended loss of Table 6.1. High early-strength concrete will be used, with fc^'=5,000 psi. Steam-curing will be utilized, and prestress force will be transferred to the girder at age three days, when fc^'=3,500 psi. | Numerade (11)Ask Our Educators

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    A pretensioned, prestressed concrete girder is to be built, with the same span and cross section as the girder in the example of Section 6.10. Pretensioning will be applied using twelve 0.5 -in. diameter stress-relieved Grade 270 strands, six of which are deflected upward at the one-quarter points of the span, to have zero eccentricity at the supports, the remainder being straight strands. The jacking force is 300,000 lb. Slip losses are fully compensated by overjacking, and friction at the tendon deflection points is negligible. Compute all losses, and express each as a percentage of the initial prestress fp i at midspan. Calculate the effectiveness ratio R. Compare the sum of losses due to elastic shortening, creep, shrinkage, and relaxation with the AASHTO recommended loss of Table 6.1. High early-strength concrete will be used, with fc^'=5,000 psi. Steam-curing will be utilized, and prestress force will be transferred to the girder at age three days, when fc^'=3,500 psi. | Numerade (12)Notes & Exams

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    A pretensioned, prestressed concrete girder is to be built, with the same span and cross section as the girder in the example of Section 6.10. Pretensioning will be applied using twelve 0.5 -in. diameter stress-relieved Grade 270 strands, six of which are deflected upward at the one-quarter points of the span, to have zero eccentricity at the supports, the remainder being straight strands. The jacking force is 300,000 lb. Slip losses are fully compensated by overjacking, and friction at the tendon deflection points is negligible. Compute all losses, and express each as a percentage of the initial prestress fp i at midspan. Calculate the effectiveness ratio R. Compare the sum of losses due to elastic shortening, creep, shrinkage, and relaxation with the AASHTO recommended loss of Table 6.1. High early-strength concrete will be used, with fc^'=5,000 psi. Steam-curing will be utilized, and prestress force will be transferred to the girder at age three days, when fc^'=3,500 psi. | Numerade (13)

    A pretensioned, prestressed concrete girder is to be built, with the same span and cross section as the girder in the example of Section 6.10. Pretensioning will be applied using twelve 0.5 -in. diameter stress-relieved Grade 270 strands, six of which are deflected upward at the one-quarter points of the span, to have zero eccentricity at the supports, the remainder being straight strands. The jacking force is 300,000 lb. Slip losses are fully compensated by overjacking, and friction at the tendon deflection points is negligible. Compute all losses, and express each as a percentage of the initial prestress fp i at midspan. Calculate the effectiveness ratio R. Compare the sum of losses due to elastic shortening, creep, shrinkage, and relaxation with the AASHTO recommended loss of Table 6.1. High early-strength concrete will be used, with fc^'=5,000 psi. Steam-curing will be utilized, and prestress force will be transferred to the girder at age three days, when fc^'=3,500 psi. | Numerade (14)

    Design of Prestressed Concrete

    Arthur H. Nilson 2nd Edition

    Chapter 6

    Chapter 1

    Chapter 3

    Chapter 4

    Chapter 5

    Chapter 6

    Chapter 7

    Chapter 8

    Chapter 9

    Chapter 10

    Chapter 11

    Sections

    Problem 1 Problem 2 Problem 3 Problem 4

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    A pretensioned, prestressed concrete girder is to be built, with the same span and cross section as the girder in the example of Section 6.10. Pretensioning will be applied using twelve 0.5 -in. diameter stress-relieved Grade 270 strands, six of which are deflected upward at the one-quarter points of the span, to have zero eccentricity at the supports, the remainder being straight strands. The jacking force is 300,000 lb. Slip losses are fully compensated by overjacking, and friction at the tendon deflection points is negligible. Compute all losses, and express each as a percentage of the initial prestress fp i at midspan. Calculate the effectiveness ratio R. Compare the sum of losses due to elastic shortening, creep, shrinkage, and relaxation with the AASHTO recommended loss of Table 6.1. High early-strength concrete will be used, with fc^'=5,000 psi. Steam-curing will be utilized, and prestress force will be transferred to the girder at age three days, when fc^'=3,500 psi. | Numerade (15)

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    A pretensioned, prestressed concrete girder is to be built, with the same span and cross section as the girder in the example of Section 6.10. Pretensioning will be applied using twelve 0.5 -in. diameter stress-relieved Grade 270 strands, six of which are (2024)

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