A 3-m 150 mm CHB wall rests on a 579 mm thick concrete footing. The CHB wall carries dead load of 133.52 kN/m and will carry a live load of 69.29 kN per meter length of wall. Assume unit weight of concrete of 24 kN/m3 and unit weight of soil of 16.36 kN/m³. Use fc' = 28 MPa, fy = 248 MPa. Steel cover to bar centroid is 90mm. Soil bearing capacity is 175.31 kPa and the top of the footing is 1.7m from the NGL. Calculate the spacing of 12 mm reinforcing bars. Note: Present the width (B) in multiples of 10 mm and present the exact required spacing in 2 decimal places (do not round off).

A 3-m 150 mm CHB wall rests on a 579 mm thick concrete footing. The CHB wall carries dead load of 133.52 kN/m and will carry a live load of 69.29 kN per meter length of wall. Assume unit weight of concrete of 24 kN/m3 and unit weight of soil of 16.36 kN/m³. Use fc' = 28 MPa, fy = 248 MPa. Steel cover to bar centroid is 90mm. Soil bearing capacity is 175.31 kPa and the top of the footing is 1.7m from the NGL. Calculate the spacing of 12 mm reinforcing bars. Note: Present the width (B) in multiples of 10 mm and present the exact required spacing in 2 decimal places (do not round off).

Principles of Foundation Engineering (MindTap Course List)

8th Edition

ISBN:9781305081550

Author:Braja M. Das

Publisher:Braja M. Das

Chapter13: Retaining Walls

Section: Chapter Questions

Problem 13.1P

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Question

A 3-m 150 mm CHB wall rests on
a 579 mm thick concrete footing.
The CHB wall carries dead load of
133.52 kN/m and will carry a live
load of 69.29 kN per meter length
of wall. Assume unit weight of
concrete of 24 kN/m3 and unit
weight of soil of 16.36 kN/m3. Use
fc' = 28 MPa, fy 248 MPa. Steel
cover to bar centroid is 90mm.
Soil bearing capacity is 175.31 kPa
and the top of the footing is 1.7m
from the NGL. Calculate the
spacing of 12 mm reinforcing bars.
Note: Present the width (B) in
multiples of 10 mm and present
the exact required spacing in 2
decimal places (do not round off).

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