A rectangular pre-tensioned simply-supported steam cured normal concrete beam with a span length subjected to a uniform dead load (w_D) represents the own weight of the beam.

Given the following:

Span Length = 10 m

b = 500 mm

h = 1000 mm

_{gamma concrete} = 25 kN/m³

f'c = 41.4 MPa

f'ci = 33.1 MPa

E_ps = 193000 MPa

A_ps = 990 mm²

f_pi = 1300 MPa

f_py = 1520 MPa

Cover = 50 mm

Find the following if the critical section is at the maximum moment:

For the 1st stage, at transfer:

1) If the steel relaxation loss percentage is 3.5%, then the time (t) in hours for this stage is nearly equal to abcdef.

2) The percentage of the other loss/es in this stage is nearly equal to abcdef%.

A rectangular pre-tensioned simply-supported steam cured normal concrete beam with a span length subjected to a uniform dead load (w_D) represents the own weight of the beam.

Given the following:

Span Length = 10 m

b = 500 mm

h = 1000 mm

_{gammaconcrete} = 25 kN/m³

f'c = 41.4 MPa

f'ci = 33.1 MPa

E_ps = 193000 MPa

A_ps = 990 mm²

f_pi = 1300 MPa

f_py = 1520 MPa

Cover = 50 mm

Find the following if the critical section is at the maximum moment:

For the 1st stage, at transfer:

1) If the steel relaxation loss percentage is 3.5%, then the time (t) in hours for this stage is nearly equal to abcdef.

a) 10 b) 12 c) 14 d) 18 e) 20 f) 22

2) The percentage of the other loss/es in this stage is nearly equal to abcdef%.

a) 1 b) 2 c) 3 d) 4 e) 5 f) 6

3) The PS force after this stage is nearly equal to abcdef gross time10³ kN.

a) 1.0 b) 1.1 c) 1.2 d) 1.3 e) 1.4 f) 1.5

For the 2nd stage, after 30 days.

4) The concrete shrinkage loss in MPa is nearly equal to abcdef.

a) 51 b) 52 c) 53 d) 58 e) 59 f) 60

5) The steel relaxation loss in this stage in MPa is nearly equal to abcdef.

a) 35 b) 50 c) 70 d) 85 e) 102 f) 117

6) If the percentage of creep of concrete loss is 7.0%, then the total percentage of losses in this stage is nearly equal to abcdef %.

a) 10 b) 11 c) 14 d) 15 e) 16 f) 17

7) The PS force after this stage is nearly equal to abcdef gross time 10³ kN.

a) 1.0 b) 1.1 c) 1.2 d) 1.3 e) 1.4 f) 1.5