If for a Class T bear the concrete strength at transfer and before losses is 4000...

 

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If for a Class T bear the concrete strength at transfer and before losses is 4000 psi, and the 28-day concrete compressive strength is 6000 psi, what is the allowable compressive stress at transfer and before losses at mid-span? O a 2400 psi O b. 100 psi O c 450 psl O d. 6658 psi O e 3500 psl If for a Class T beam the concrete strength at transfer and before losses is 4000 psi, and the 28-day concrete compressive strength is 6000 psi, what is the maximum allowable tensile service stress after losses? O a. 667.77 psi O b. 6 psi O c. 231.22 psi O d. 6458.86 psi O e. 929.52 psl O a. 198335.78 lbs O b. 423115.56 lbs O c. 4000 psi O d. 3000 psi e. 296341.46 lbs If for a Class T bear the concrete strength at transfer and before losses is 4000 psi, and the 28-day concrete compressive strength is 6000 psi, what is the allowable tensile stress at transfer and before losses? If for the same conditions as in questions 7 to 10, the effective prestressing force is 243000 lbs, and the residual prestress loss ratio is 0.82, what is the required initial prestressing force? a. 954.44 psi tens O a 3000.00 psi O b. 379.47 psl O c. 125.55 psi O b. 12.76 comp O c. 445.65 psi comp d. 21.68 psi tens e. 247.72 psi tens O d.250.35 lbs.in O e 4000 psi If for a Class T beam the concrete strength at transfer and before losses is 4000 psl, and the 28-day concrete compressive strength is 6000 psi, what is the allowable compressive service stress after losses and under total service loads? O a. 7000 psi Ob. 3000 psi O c. 4800 psi O d. 6000 psi O e 3600 psl For the conditions of the previous questions, what is the stress at transfer and before losses at the top of the beam at the transfer point, if the beam has the following properies: radius of gyration = 7.074 in; area = 449 square inch; prestressed force eccentricity = 11.95 in; upper section modulus = 3606.58 cubic inch; lower section modulus = 1264.43 cubic inch; centroidal distance to top of beam = 6.23 in, and the centroidal distance to bottom of beam = 17.77 in? If for a Class T bear the concrete strength at transfer and before losses is 4000 psi, and the 28-day concrete compressive strength is 6000 psi, what is the allowable compressive stress at transfer and before losses at mid-span? O a 2400 psi O b. 100 psi O c 450 psl O d. 6658 psi O e 3500 psl If for a Class T beam the concrete strength at transfer and before losses is 4000 psi, and the 28-day concrete compressive strength is 6000 psi, what is the maximum allowable tensile service stress after losses? O a. 667.77 psi O b. 6 psi O c. 231.22 psi O d. 6458.86 psi O e. 929.52 psl O a. 198335.78 lbs O b. 423115.56 lbs O c. 4000 psi O d. 3000 psi e. 296341.46 lbs If for a Class T bear the concrete strength at transfer and before losses is 4000 psi, and the 28-day concrete compressive strength is 6000 psi, what is the allowable tensile stress at transfer and before losses? If for the same conditions as in questions 7 to 10, the effective prestressing force is 243000 lbs, and the residual prestress loss ratio is 0.82, what is the required initial prestressing force? a. 954.44 psi tens O a 3000.00 psi O b. 379.47 psl O c. 125.55 psi O b. 12.76 comp O c. 445.65 psi comp d. 21.68 psi tens e. 247.72 psi tens O d.250.35 lbs.in O e 4000 psi If for a Class T beam the concrete strength at transfer and before losses is 4000 psl, and the 28-day concrete compressive strength is 6000 psi, what is the allowable compressive service stress after losses and under total service loads? O a. 7000 psi Ob. 3000 psi O c. 4800 psi O d. 6000 psi O e 3600 psl For the conditions of the previous questions, what is the stress at transfer and before losses at the top of the beam at the transfer point, if the beam has the following properies: radius of gyration = 7.074 in; area = 449 square inch; prestressed force eccentricity = 11.95 in; upper section modulus = 3606.58 cubic inch; lower section modulus = 1264.43 cubic inch; centroidal distance to top of beam = 6.23 in, and the centroidal distance to bottom of beam = 17.77 in?

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