A concrete beam ( rectangular) of cross-section 30 cm deep and 20 cm wide is pre-stressed by (15) wires of 5 mm diameter located (6.5 ) cm from the bottom of the beam and 3 wires of diameter of 5 mm, 2.5 cm from the top. ASsuming the pre-stress in the steel as 840 N/mm, calculate the stresses at the extreme fibers of the mid-span section when the beam is supporting its own weight over a span of 6 m. If a uniformly distributed live load of 6kN/m is imposed, evaluate the maximum working stress in concrete. The density of concrete is 24KN/m³. 200 mm T 25 mm LL=6kN/m 300 mm 6 m 65 mm
A concrete beam ( rectangular) of cross-section 30 cm deep and 20 cm wide is pre-stressed by (15) wires of 5 mm diameter located (6.5 ) cm from the bottom of the beam and 3 wires of diameter of 5 mm, 2.5 cm from the top. ASsuming the pre-stress in the steel as 840 N/mm, calculate the stresses at the extreme fibers of the mid-span section when the beam is supporting its own weight over a span of 6 m. If a uniformly distributed live load of 6kN/m is imposed, evaluate the maximum working stress in concrete. The density of concrete is 24KN/m³. 200 mm T 25 mm LL=6kN/m 300 mm 6 m 65 mm
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:A concrete beam ( rectangular) of cross-section 30 cm deep and 20 cm wide is pre-stressed
by (15) wires of 5 mm diameter located (6.5 ) cm from the bottom of the beam and 3 wires
of diameter of 5 mm, 2.5 cm from the top. Assuming the pre-stress in the steel as 840
N/mm", calculate the stresses at the extreme fibers of the mid-span section when the beam
is supporting its own weight over a span of 6 m. If a uniformly distributed live load of
6kN/m is imposed, evaluate the maximum working stress in concrete. The density of
concrete is 24KN/m³.
200 mm
T 25 mm
LL=6kN/m
300 mm
6 m
K
65 mm
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