. A rectangular concrete beam of cross-section 30 cm deep and 20 cm wide is pre-stressed by means of 15 wires of 5 mm diameter located 6.5 cm from the bottom of the beam and 3 wires of diameter of 5mm, 2.5 cm from the top. Assuming the pre-stress in the steel as 840 N/mm2 . 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 6 kN/m is imposed. Evaluate the maximum working stress in concrete. The density of concrete is (8+20) kN/m3.
. A rectangular concrete beam of cross-section 30 cm deep and 20 cm wide is pre-stressed by means of 15 wires of 5 mm diameter located 6.5 cm from the bottom of the beam and 3 wires of diameter of 5mm, 2.5 cm from the top. Assuming the pre-stress in the steel as 840 N/mm2 . 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 6 kN/m is imposed. Evaluate the maximum working stress in concrete. The density of concrete is (8+20) kN/m3.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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. A rectangular concrete beam of cross-section 30 cm deep and 20 cm wide is pre-stressed by means of 15
wires of 5 mm diameter located 6.5 cm from the bottom of the beam and 3 wires of diameter of 5mm, 2.5 cm
from the top. Assuming the pre-stress in the steel as 840 N/mm2
. 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 6 kN/m is imposed. Evaluate the maximum working stress in concrete. The density of
concrete is (8+20) kN/m3.
Transcribed Image Text:200 mmn
25 mm
Live load- 6 kN/m
300 mm
6 m
65 mm
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