Where it get the 2 and 0 here, the green circle

Structural Analysis
6th Edition
ISBN:9781337630931
Author:KASSIMALI, Aslam.
Publisher:KASSIMALI, Aslam.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
icon
Related questions
Question

Questions: Where it get the 2 and 0 here, the green circle. please explain how it get it

b. Long term deflection
Since only 30% of the live load is sustained
W₁ = 9+0.3(12)=12.6kN/m
T
S' =
§
1+50p
Long term deflection
2
5W, Lª
T
384 Ele
-
5(12.6) (6000)4
384 (20000 )3322.1(10)"
2
1+50(0)
2
8₁ = 8 + 28'
L
=
: 3.20 mm
8₁ = 8 + 28 ' = 5.33 +2(3.20) = 11.73 mm
L
Transcribed Image Text:b. Long term deflection Since only 30% of the live load is sustained W₁ = 9+0.3(12)=12.6kN/m T S' = § 1+50p Long term deflection 2 5W, Lª T 384 Ele - 5(12.6) (6000)4 384 (20000 )3322.1(10)" 2 1+50(0) 2 8₁ = 8 + 28' L = : 3.20 mm 8₁ = 8 + 28 ' = 5.33 +2(3.20) = 11.73 mm L
A concrete beam 6 m long is 300 mm wide and 600 mm deep and
carries a dead load of 9 kN/m and live load of 12 kN/m. The beam
is reinforced for tension only with four 25 mm bars with an effective
depth to tension bars of 530 mm. fc' = 20.7 MPa, fy = 345 MPa,
fr = 2.832 MPa, Ec = 20,000 MPa, Es = 200,000 MPa.
Covering of bars is 70 mm.
a) Calculate the maximum instantaneous deflection due to dead load
and live load.
b) Calculate the deflection due to the same loads after five years
assuming that 30% of the live load is sustained.
Transcribed Image Text:A concrete beam 6 m long is 300 mm wide and 600 mm deep and carries a dead load of 9 kN/m and live load of 12 kN/m. The beam is reinforced for tension only with four 25 mm bars with an effective depth to tension bars of 530 mm. fc' = 20.7 MPa, fy = 345 MPa, fr = 2.832 MPa, Ec = 20,000 MPa, Es = 200,000 MPa. Covering of bars is 70 mm. a) Calculate the maximum instantaneous deflection due to dead load and live load. b) Calculate the deflection due to the same loads after five years assuming that 30% of the live load is sustained.
Expert Solution
steps

Step by step

Solved in 3 steps with 14 images

Blurred answer
Knowledge Booster
Physical laws and observations
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.
Similar questions
Recommended textbooks for you
Structural Analysis
Structural Analysis
Civil Engineering
ISBN:
9781337630931
Author:
KASSIMALI, Aslam.
Publisher:
Cengage,
Structural Analysis (10th Edition)
Structural Analysis (10th Edition)
Civil Engineering
ISBN:
9780134610672
Author:
Russell C. Hibbeler
Publisher:
PEARSON
Principles of Foundation Engineering (MindTap Cou…
Principles of Foundation Engineering (MindTap Cou…
Civil Engineering
ISBN:
9781337705028
Author:
Braja M. Das, Nagaratnam Sivakugan
Publisher:
Cengage Learning
Fundamentals of Structural Analysis
Fundamentals of Structural Analysis
Civil Engineering
ISBN:
9780073398006
Author:
Kenneth M. Leet Emeritus, Chia-Ming Uang, Joel Lanning
Publisher:
McGraw-Hill Education
Sustainable Energy
Sustainable Energy
Civil Engineering
ISBN:
9781337551663
Author:
DUNLAP, Richard A.
Publisher:
Cengage,
Traffic and Highway Engineering
Traffic and Highway Engineering
Civil Engineering
ISBN:
9781305156241
Author:
Garber, Nicholas J.
Publisher:
Cengage Learning