*Subject: Reinforced prestressed concrete - Civil Engineering*Please refer for my attached formula or guidelines solve this problem*The fy=276 should multiply the (0.4+fy/700) since states other fy=415 ; t=L/10 x (0.4+fy/700) A one way cantilever slab having a simple span of 2.0 m.The slab is to carry a uniform dead load of 2.5 KPaand uniform live load of 1.5 Kpa. Fc’=27.6 MPA, fy= 276 MPA forfor main bars and temperature bars. Concrete weighs is 23.5 kN/m3. Determine the spacing of the main bars and also kindly explain why you use factor (1.2D + 1.6L) or D + L if are require in this problem. Note: Please don’t forget to explain thank you, since there is no Design term in this problem or correct me what should it use if need to factor 1.2D + 1.6 L or just add Dead load with weight of the beam and the live load. MINIMUM THICKNESS OF NON-PRESTRESSED BEAMSAND ONE WAY SLABS UNLESS DEFLECTIONS ARECOMPUTEDSolid One-Way SlabBeams or ribbedone way slabSimplyGeneral ProcedureSupportedL/20RuL/16=5.One end continuous■ For structural lightweight concrete the values shall be multiplied by(1.65 -0.0005 Wc) but not less than 1.09, where Wc is the unit mass in kg/m³.■ For fy other 415 MPa, the values shall be multiplied by(0.4 +fy/700)PLEASE REFER5. Compute design constantsSpan Length L in millimetersValues given shall be used directly for members with normal density concrete andGrade 60 (415 MPa) reinforcement. For other conditions, the values shall bemodified as follows:Muobd 2L/24L/18.5Design of one way slabGiven: Loads, type of slab, fc,fy, WHIS FORMULA ANDReq'd: t, size and spacing of main bars GUIDELINEStemperature bars1. Determine the minimum slab thickness t using table for minimumthickness of non prestressed beams and one way slab. Thisthickness should be at least 75 mm2. Compute the weight of the slab (this is to be added to the givendead load)3. Calculate the design moment Mu4. Compute the effective depth dm =d = t - covering - 2 bar diameter (minimum of 12 mm)p>PminSolve for As0.85 fc'Both ends continuousL/28p=₁L/211As = pbd6. Solve for the spacing of barsmS =CantileverA1000Awhere : A₁ = area of 1 barUse the smallest of the followingb)3tc) 450 mmL/10L/82mR.fya)S7. Solve for area of temperature barsA₁ = 0.002bt, A₁ = 0.0018bt, A₁ =0.0018(400)bt/fy8. Solve for the spacing of temperature bars S₁ = 4¹1000A₁where : A₁ = area of 1 temperature bar ( minimum of 10mm dia.)Use the smallest of the followinga) Stb) 5tc)450 mm

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Answered: A one way cantilever slab having a…

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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*Subject: Reinforced prestressed concrete - Civil Engineering

*Please refer for my attached formula or guidelines solve this problem

*The fy=276 should multiply the (0.4+fy/700) since states other fy=415 ; t=L/10 x (0.4+fy/700)

A one way cantilever slab having a simple span of 2.0 m.

The slab is to carry a uniform dead load of 2.5 KPa

and uniform live load of 1.5 Kpa. Fc’=27.6 MPA, fy= 276 MPA for

for main bars and temperature bars. Concrete weighs is 23.5 kN/m3. Determine the spacing of the main bars and also kindly explain why you use factor (1.2D + 1.6L) or D + L if are require in this problem.

Note: Please don’t forget to explain thank you, since there is no Design term in this problem or correct me what should it use if need to factor 1.2D + 1.6 L or just add Dead load with weight of the beam and the live load.

MINIMUM THICKNESS OF NON-PRESTRESSED BEAMS
AND ONE WAY SLABS UNLESS DEFLECTIONS ARE
COMPUTED
Solid One-Way Slab
Beams or ribbed
one way slab
Simply
General Procedure
Supported
L/20
Ru
L/16
=
5.
One end continuous
■ For structural lightweight concrete the values shall be multiplied by
(1.65 -0.0005 Wc) but not less than 1.09, where Wc is the unit mass in kg/m³.
■ For fy other 415 MPa, the values shall be multiplied by
(0.4 +fy/700)
PLEASE REFER
5. Compute design constants
Span Length L in millimeters
Values given shall be used directly for members with normal density concrete and
Grade 60 (415 MPa) reinforcement. For other conditions, the values shall be
modified as follows:
Mu
obd 2
L/24
L/18.5
Design of one way slab
Given: Loads, type of slab, fc,fy, WHIS FORMULA AND
Req'd: t, size and spacing of main bars GUIDELINES
temperature bars
1. Determine the minimum slab thickness t using table for minimum
thickness of non prestressed beams and one way slab. This
thickness should be at least 75 mm
2. Compute the weight of the slab (this is to be added to the given
dead load)
3. Calculate the design moment Mu
4. Compute the effective depth d
m =
d = t - covering - 2 bar diameter (minimum of 12 mm)
p>Pmin
Solve for As
0.85 fc'
Both ends continuous
L/28
p=₁
L/21
1
As = pbd
6. Solve for the spacing of bars
m
S =
Cantilever
A1000
A
where : A₁ = area of 1 bar
Use the smallest of the following
b)3t
c) 450 mm
L/10
L/8
2mR.
fy
a)S
7. Solve for area of temperature bars
A₁ = 0.002bt, A₁ = 0.0018bt, A₁ =0.0018(400)bt/fy
8. Solve for the spacing of temperature bars S₁ = 4¹1000
A₁
where : A₁ = area of 1 temperature bar ( minimum of 10mm dia.)
Use the smallest of the following
a) St
b) 5t
c)450 mm

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