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/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 Ilive load of 6 kN/m is imposed. Evaluate the maximum working stress in concrete. The density of concrete is (P+20) kN/m³. 200 mm 25 mm Live load -6 kN/m 300 mm 6 m 65 mm
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/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 Ilive load of 6 kN/m is imposed. Evaluate the maximum working stress in concrete. The density of concrete is (P+20) kN/m³. 200 mm 25 mm Live load -6 kN/m 300 mm 6 m 65 mm
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
Related questions
Question
Transcribed Image Text:Q # 1. 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/mmf. 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 (P+20) kN/m³.
200 mm
25 mm
Live load- 6 kN/m
300 mm
6 m
65 mm
Q # 2. An un-symmetrical section beam is used to support an imposed load of 2 kN/m over a span of 8 m. The
ottom flange, 100 mm wide and 60 mm
sectional details are top flange. 300 mm wide and 60 mm thick
thick; thickness of the web = 80 mm; overall depth of the beam= 400 mm. At the centre of the span, the
effective pre-stressing force of (P+100) kN is located at 50 mm from the soffit of the beam. Estimate the
stresses at the centre of span section of the beam for the following load conditions:
a) Pre-stress and self-weight
b) Pre-stress, self-weight and live load.
300 mm
60 mim
LIVE load 2 kNm
S00 mm
6-194 imim
60 mm
100 rmim
Expert Solution
This question has been solved!
Explore an expertly crafted, step-by-step solution for a thorough understanding of key concepts.
This is a popular solution!
Trending now
This is a popular solution!
Step by step
Solved in 2 steps with 2 images
Knowledge Booster
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, civil-engineering and related others by exploring similar questions and additional content below.Recommended textbooks for you
Structural Analysis (10th Edition)
Civil Engineering
ISBN:
9780134610672
Author:
Russell C. Hibbeler
Publisher:
PEARSON
Principles of Foundation Engineering (MindTap Cou…
Civil Engineering
ISBN:
9781337705028
Author:
Braja M. Das, Nagaratnam Sivakugan
Publisher:
Cengage Learning
Structural Analysis (10th Edition)
Civil Engineering
ISBN:
9780134610672
Author:
Russell C. Hibbeler
Publisher:
PEARSON
Principles of Foundation Engineering (MindTap Cou…
Civil Engineering
ISBN:
9781337705028
Author:
Braja M. Das, Nagaratnam Sivakugan
Publisher:
Cengage Learning
Fundamentals of Structural Analysis
Civil Engineering
ISBN:
9780073398006
Author:
Kenneth M. Leet Emeritus, Chia-Ming Uang, Joel Lanning
Publisher:
McGraw-Hill Education
Traffic and Highway Engineering
Civil Engineering
ISBN:
9781305156241
Author:
Garber, Nicholas J.
Publisher:
Cengage Learning