1. 1
Presidency University
Azimur Rahman School of Engineering
DEPARTMENT OF CIVIL ENGINEERING
TITLE OF THE CAPSTONE DESIGN
DESIGN OF SIX STORED RESIDENTIAL BUILDING
Capstone Report (CE-492&CE-493)
DEPARTMENT OF CIVIL ENGINEERING
Presidency University, Dhaka, Bangladesh
January-2017
2. 2
TITLE OF THE CAPSTONE DESIGN
DESIGN OF SIX STORIED RESIDENTIAL BUILDING
A Capstone Design Submitted to the
Department of Civil Engineering
Presidency University
Azimur Rahman School of Engineering
Submitted By
Name Student ID
Sharmin Aktar 132219046
Md. Rajib Hossain 141054046
Md. Sumon Miah 141057046
Md.Mehedi Amin 141073046
Md. Kawser Ahmed Rony 141081046
Mostakim Alam 141112046
Submitted to the Department of Civil Engineering of Presidency University, Dhaka,
Bangladesh in partial fulfillment of the requirements for the degree of
BSC IN CIVIL ENGINEERING
3. 3
DECLARATION
It is stated that the work “DESIGN OF SIX STORIED RESIDENTIAL BUILDING “reported in this
capstone has been performed under supervision of Md. Rokon Hasan, Lecturer, Department
of Civil Engineering, Presidency University, Dhaka. To the best of our knowledge and belief,
the capstone contains no materials previously published or written by another person
except where due reference is made in the capstone itself.
SharminAktar Md. Rajib Hossain
Md. Sumon Miah Md. Mehedi Amin
Kawser Ahmed Rony Mostakim Alam
4. 4
ACKNOWLEDGEMENT
It gives us a great pleasure to express our greatest appreciation to all of those people who
had helped us along the training until writing this report.
First and foremost, we would like to express our great full to Allah SWT because of bring us
here and give us good health. Secondly, we would like to thanks our family for all their
support, love and prayer.
It would not have been possible to write that thesis without the help and support our
supervisor Md. Rokon Hasan, Lecturer, Department of civil Engineering, PRESSIDENCY
UNIVERSITY, Dhaka, Bangladesh for his valuable continuous guidance, helpful suggestions
and constant encouragement for this going of thesis.
We would like to acknowledge the academic and technical support of Presidency University
and its staff. Thanks, because guide and give us to perform here. With their Accompany this
report would a reality. Once again, we are great full for all their helping us to complete our
report successfully.
Thanks, you.
6. 6
TABLE OF CONTENTS
Sl. No. Title
CHAPTER 1
INTRODUCTION
1.1 GENERAL
1.2 OBJECTIVES
1.3 PRELIMINNARY DESIGN AND OPTIMIZATION
1.4 INITIAL SELECTION OF STRUCTURAL SYSTEM
1.5 ADVANTAGES AND LIMITATION STRUCTURAL OPTIMIZATION
CHAPTER 2
SLAB DESIGN
2.1 DESIGN DATA
2.2 LOAD CALCULATION
2.3 CHECK ONE WAY OR TWO -WAY SLAB
2.4 All Slab Maximum Moment Ageist Thickness Check
2.5 All Slab Maximum Moment Ageist Main Reinforcement Calculation
2.6 SLAB DESIGN HEAD CALCULATION
CHAPTER 3
BEAM DESIGN
3.1 STIRRUP DESIGN
3.2 MOMENT AND SHEAR CHART
3.3.0 BEAM DESIGN DATA
3.3.1 DESIGN OF BEAM FOR SHEAR
CHAPTER 4
4.1 GENERAL
4.2.2 COLUMN DESIGN CANCULATION
4.3 COLUMN DESIGN CANCULATION SUMMARY
4.4 AXIAL FORCE, MOMENT,2-2 AND MOMENT 3-3 CHART
4.5 INTERACTION DIAGRAM
4.6 STRIUP DESIGN
CHAPTER 5
STAIR DESIGN
5.1 STAIR DESIGNDATA
CHARTER 6
FOOTING DESIGN
6.1 FOORTING DESIGN DATA
CHARTER 7
UNDERGROUND WATER TANK DESIGN
7.1 DESIGN DATA
7.2 BASE SLAB DESIGN
7.3 COVER SLAB DESIGN
7. 7
7.4 DESIGN OF SIDE WALL
OVERHEAD WATER TANK DESIGN
7.5 DESIGN DATA
7.6 BASE SLAB DESIGN
7.7 COVER SLAB DESIGN
7.8 DESIGN OF SIDE WALL
CHAPTER 8
REFERENCES
CHAPTER 9
APPENDEX
9.1 EARTHQUAKE LOAD CALCULATION
9.2 WIND LOAD CALCULATION
9.3 BUILDING DESIGN USING ETABS
LIST OF FOGURE
Sl.No Title
Figure-1.1 3D View of Project
Figure-1.2 Typical Floor Lay out Plane
Figure-1.3 Typical Floor Working Lay out Plane
Figure-1.4 Ground Floor Lay out Plan
Figure-1.5 Stair Case Section View
Figure-1.6 Front Elevation
Figure-3.1 Slab Reinforcement in Short Direction
Figure-3.2 Slab Reinforcement in Long Direction
Figure-3.3 Slab Reinforcement Details (Both Long and Short Direction)
8. 8
Figure-4.1 Floor Beam Reinforcement Section and Details
Figure-4.2 Floor Beam Lay out Plan
Figure-5.1 Column lay out Plan
Figure-5.2 Column Reinforcement Details
Figure 6.1 Stair Reinforcement Details and Layout Plan
Figure-7.1 Footing and Column Layout Plane
Figure-7.2 Footing Layout Plane Cad View
Figure-7.3 Footing Details
Figure-7.4 Footing Reinforcement Details Section A-A
Figure-8.1 Under Ground Water Tank Design Detailing
Figure-8.2 Overhead Tank Design Detailing
Figure-12.1 ETABS Floor Plan
Figure-12.2 ETABS Floor Plan 3D
Figure-12.3 ETABS Elevation View
Figure-12.4 ETABS Elevation View 3D
Figure-12.5 ETABS Column and Beam 3D View
Figure-12.6 ETABS Axial Force Diagram with Value X-X
Figure-12.7 ETABS Axial Force Diagram with Value Y-Y
Figure-12.8 ETABS Shear Force 2-2 Diagram
Figure-12.9 ETABS Moment 2-2 Diagram
Figure-12.10 ETABS Moment 3-3 Diagram
Figure-12.11 Other Appendix Diagram
9. 9
LIST OF ABBREVIATION
BNBC = Bangladesh National Building Code.
ACI = American Concrete Institute.
ASTM = American Society for Testing of Materials.
AASHTO = American Associate State Highway Transport Officials.
DCSS = Design Criteria for Structural System.
BSS = Building Shapes and Setbacks
RCC=Reinforcement Cement Concrete
CC=Cement Concrete
10. 10
Symbols and Notation
The following symbols and notation apply only to the provision of Section 2.4
a = depth of equivalent rectangular stress block as defined in Sec 6.2.3.7
A = effective tension area of concrete surrounding the flexural tension
reinforcement and having the same centroid as that of the reinforcement,
divided by the number of bars. When the flexural reinforcement consists of
different bar sizes the number of bars or wires shall be computed as the
total area of reinforcement divided by the area of the largest bar used
Ag = gross area of section
= total area of longitudinal reinforcement to resist torsion
As = area of tension reinforcement
= area of compression reinforcement
As1 = area of tension reinforcement corresponding to moment of resistance M1
As2 = area of additional tension steel
Asf = area of reinforcement required to balance the longitudinal compressive
force in the overhanging portion of the flange of a T-beam
Ask = area of skin reinforcement per unit height in a side face
At = area of one leg of a closed stirrup resisting torsion within a distance s
Av = area of shear reinforcement within a distance
b = width of compression face of member
bt = width of that part of cross-section containing the closed stirrups resisting
torsion
bw = web width, or diameter of circular section
c = distance from extreme compression fiber to neutral axis
Ct = factor relating shear and torsional stress properties =
d = distance from extreme compression fiber to centroid of tension
reinforcement
dc = thickness of concrete cover measured from extreme tension fiber to Centre
of bar or wire located closest thereto
Es = modulus of elasticity of reinforcement
fs = calculated stress in reinforcement at service loads
fr = modulus of rupture of concrete
fy = specified yield strength of reinforcement
h = overall thickness of member
Icr = moment of inertia of cracked section transformed to concrete
Ie = effective moment of inertia for computation of deflection
Ig = moment of inertia of gross concrete section about centroidal axis,
neglecting reinforcement
M1 = moment of resistance of a section without compression steel
M2 = additional moment of resistance due to added compression steel and
additional tension steel As2
11. 11
Mn1 = moment of resistance developed by compression in the overhanging
portion of the T-flange
Mn2 = moment of resistance developed by the web of a T-beam
Ma = maximum moment in member at stage deflection is computed
Mcr = cracking moment
Mm = modified moment
Mmax = maximum moment at section due to externally applied loads
Mn = nominal flexural strength
Mu = factored moment at section
Nu = axial load normal to cross-section occurring simultaneously with Vu; to be
taken as positive for compression, negative for tension and to include
effects of tension due to creep and shrinkage
s = spacing of shear or torsion reinforcement in direction parallel to
longitudinal reinforcement
Tc = torsional moment strength provided by concrete
Tn = torsional moment strength
Ts = torsional moment strength provided by torsion reinforcement
Tu = torsional moment at section
Vu = shear at section
Vc = shear strength provided by concrete
Vn = shear strength
Vs = nominal shear strength provided by shear reinforcement
wu = factored load per unit length of beam or per unit area of slab
x = shorter overall dimension of rectangular part of cross-section
x1 = shorter Centre to Centre dimension of closed rectangular stirrup
y = longer overall dimension of rectangular part of cross-section
y1 = longer Centre to Centre dimension of closed rectangular stirrup
z = quantity limiting distribution of flexural reinforcement, see Eq (6.2.35)
a = depth of equivalent rectangular stress block as defined in Sec 6.2.3.7
Ab = area of an individual bar, mm2
As = area of tension reinforcement, mm2
Atr = total cross-sectional area of transverse reinforcement (stirrup or tie) within
a spacing s and perpendicular to plane of bars being spliced or developed,
mm2
Av = area of shear reinforcement within a distance s, mm2
bw = web width, or diameter of circular section, mm
d = distance from extreme compression fiber to centroid of tension
reinforcement, mm
db = nominal diameter of bar, mm
h = overall thickness of member, mm
a = additional embedment length at support or at point of inflection, mm
d = development length, mm
12. 12
db = basic development length, mm
dh = development length of standard hook in tension, measured from the
critical section to the farthest point on the bar, parallel to the straight part
of the bar, mm
hb = basic development length of standard hook in tension, mm
Mn = nominal moment strength at section, N-mm
N = number of bars, in a layer, being spliced or developed at a critical section
s = spacing of stirrups or ties, mm
Vu = factored shear force at section, N
b = ratio of area of reinforcement cut off to total area of tension
reinforcement at section.
cc = creep coefficient
Ec = modulus of elasticity of concrete
Es = modulus of elasticity of reinforcement
Et = modulus of elasticity of concrete at the age of loading t
ƒy = specified yield strength of reinforcement
K = coefficient of shrinkage
s = standard deviation
wc = unit weight of concrete
cc = creep strain in concrete
sh = shrinkage of plain concrete
a = depth of equivalent rectangular stress block for strength design
Ab = cross-sectional area of anchor bolt
Ae = effective area of masonry
Ag = gross area of wall
Amv= net area of masonry section bounded by wall thickness and length of section
in the direction of shear force considered
Ap = area of tension (pullout) cone of an embedded anchor bolt projected into
the surface of masonry
As = effective cross-sectional area of reinforcement in a flexural member
Av = area of steel required for shear reinforcement perpendicular to the
longitudinal reinforcement
b = effective width of rectangular member or width of flange for T and I section
bt = computed tension force on anchor bolt
bv = allowable shear force on anchor bolt
bw = width of web in T and I member
Bt = allowable tension force on anchor bolt
Bv = computed shear force on anchor bolt
c = distance from the neutral axis to extreme fiber
Cd = masonry shear strength coefficient
d = distance from the compression face of a flexural member to the centroid of
longitudinal tensile reinforcement
db = diameter of the reinforcing bar, diameter of bolt
13. 13
e = eccentricity of Pu
emu= maximum usable compressive strain of masonry
Em = modulus of elasticity of masonry
Es = modulus of elasticity of steel
fa = computed axial compressive stress due to design axial load
fb = computed flexural stress in the extreme fiber due to design bending load
only
fmd = computed compressive stress in masonry due to dead load only
fr = modulus of rupture
fs = computed stress in reinforcement due to design load
fy = tensile yield stress of reinforcement
fv = computed shear stress due to design load
F = loads due to weight and pressure of fluids or related moments and forces
Fa = allowable average axial compressive stress for centroid ally applied axial
load only
Fb = allowable flexural compressive stress if members were carrying bending load
only
Fbr = allowable bearing stress
Fs = allowable stress in reinforcement
Fsc = allowable compressive stress in column reinforcement
Ft = allowable flexural tensile stress in masonry
Fv = allowable shear stress in masonry
G = shear modulus of masonry
h = height of wall between points of support
h = effective height of a wall or column
H = actual height between lateral supports
H' = height of opening
I = moment of inertia about the neutral axis of the cross-sectional area
Ig,Icr= gross, cracked moment of inertia of the wall cross-section
j = ratio or distance between centroid of flexural compressive force and
centroid of tensile forces to depth, d
k = ratio of depth of the compression zone in flexural member to depth, d;
stiffening coefficient
= length of a wall or segment
b = embedment depth of anchor bolt
be = anchor bolt edge distance, the least length measured from the edge of
masonry to the surface of the anchor bolt
d = required development length of reinforcement
L = actual length of wall
M = design moment
Mc = moment capacity of the compression steel in a flexural member about the
centroid of the tensile force
Mcr = cracking moment strength of the masonry wall
14. 14
Mm = the moment of the compressive force in the masonry about the centroid of
the tensile force in the reinforcement
Mn = nominal moment strength of the masonry wall
Ms = the moment of the tensile force in the reinforcement about the centroid of
the compressive force in the masonry
Mser = service moment at the mid-height of the panel, including P-Delta effects
Mu = factored moment
n = modular ratio = Es/Em
P = design axial load
Pa = allowable centroidal axial load for reinforced masonry columns
Pb = nominal balanced design axial strength
Pf = load from tributary floor or roof area
Po = nominal axial load strength with bending
Pu = factored axial load
Puf = factored load from tributary floor or roof loads
Puw= factored weight of the wall tributary to the section under consideration
Pw = weight of the wall tributary to the section under consideration
rb = ratio of the area of bars cut off to the total area of bars at the section
s = spacing of stirrups or bent bars in a direction parallel to that of the main
reinforcement
S = section modulus
t = effective thickness of a Wythe, wall or column
u = bond stress per unit of surface area of bar
V = total design shear force
Vn = nominal shear strength
Vm = nominal shear strength provided by masonry
Vs = nominal shear strength provided by shear reinforcement
∆u = horizontal deflection at mid-height under factored load; P-Delta effects shall
be included in deflection calculation
= steel ratio = As/bd
n = ratio of distributed shear reinforcement on a plane perpendicular to the
plane of Amv
∑o = sum of the perimeters of all the longitudinal reinforcement
A = tributary area, square meters.
a = width of pressure coefficient zone used in Fig 6.2.7 and 6.2.8, meters
B = horizontal dimension of buildings and structures measured normal to
wind direction, meters.
c = average horizontal dimension of the building or structure in a direction
normal to the wind, meters.
Cc = velocity-to-pressure conversion coefficient =47.2x10-6
CG = gust coefficient
CI = structure importance coefficient
15. 15
Cp = pressure coefficient to be used for determination of wind loads on
buildings and structures.
Ct = local topographic coefficient given in Sec 2.4.6.8.
Cz = combined height and exposure coefficient for a building at height z above
ground
D = diameter of a circular structure or member, meters
d = diameter of a circular structure or member, meters
Do = surface drag coefficient given in Table 6.2.12.
f = fundamental frequency of buildings or structures in a direction parallel to
the wind, Hz
F1, F2 = design wind forces on primary framing system, KN
Gh = gust response factor for primary framing systems evaluated at height z =
h
Gz = gust response factor for components and cladding evaluated at height
zabove ground
h = mean roof height or height to top of parapet whichever is greater of a
building or structure, except that eaves height may be used for roof slope
of less than 10 degrees, meters.
J = pressure profile factor as a function of ratio
L = horizontal dimension of a building or structure measured parallel to wind
direction, meters
M = larger dimension of a sign, meters
N = smaller dimension of asign, meters
p = design pressure to be used in determination of wind loads for
buildings,kN/m2
ph = design pressure evaluated at height z =h, kN/m2
pi = internal pressure, kN/m2
pz = design wind pressure evaluated at height z above ground, kN/m2
q = sustained wind pressure, kN/m2
qh = sustained wind pressure evaluated at height z=h,kN/m2
qz = sustained wind pressure evaluated at height z above ground, in kN/m2
r = rise-to-span ratio for arched roofs
s = surface friction factor given in Table 6.2.12
S = structure size factor given in Fig 6.2.4
TI = turbulence intensity factor evaluated at two-thirds of the mean roof
height or parapet height of the structure (see Eq 2.4.11)
V = basic wind speed, km/h
X = distance to Centre of pressure from windward edge, meters
Y = response factor as a function of the ratio and the ratio c/h given in Fig
6.2.3
z = height above ground level, meters
zg = gradient height given in Table 6.2.12, meters
16. 16
= power-law coefficient given in Table 6.2.12
= structural damping coefficient (fraction of critical damping)
= ratio obtained from Table 6.2.12
= ratio of solid area to gross area for open sign face of a trussed tower, or
lattice structure
= angle of the plane of roof from horizontal, degrees
= height-to-width ratio for sign or hoarding
= angle between wind direction and chord of tower guy, degrees.
C = numerical coefficient specified in Sec 2.5.6.1
D = dead load on a member including self-weight and weight of components,
materials and permanent equipment’s supported by the member
E = earthquake load
E' = amplified earthquake load equal to (0.375R)E
Fi = lateral force applied at level-iof a building
Ft = a portion of the seismic base shear, V, considered concentrated at the top
of the building in addition to the force Fn
h = height of a building or a structure above ground level inmeters
hi,hn,hx = height in meters above ground level to level-i, -n or -x respectively
level-i = i-th level of a structure above the base; i=1 designates the first level
above the base
level-n = upper most level of a structure
level-x = x-th level of a structure above the base; x=1 designates the first level
above the base.
L = live load due to intended use or occupancy
Mx = overturning moment at level-x
V = the total design lateral force or shear at the base
Vx = the story shear at story level-x
R = response modification coefficient for structural system given in Table
6.2.26 for seismic design.
T = fundamental period of vibration in seconds
W = the weight of an element or component
Z = seismic zone coefficient given in Table 6.2.22
∆ = story lateral drift.
25. 25
2.1 DESIGN DATA
Concrete Design Strength 𝑓′ 𝑐 = 3.0 𝐾𝑠𝑖
Yield Strength of Steel 𝑓𝑦 = 60 𝐾𝑠𝑖
𝜀 𝑢 = 0.003
𝜀𝑡 = 0.005
𝛽1 = 0.85
∅ = 0.90
𝑏 = 12"
2.2 LOAD CALCULATION
Sl.No Load Psf
1 Live Load LL 40
2 Partition Wall Load PW 50
3 Floor Finishing FF 25
4 Total Factored Uniform Live Load Wull=LLX1.7 68
5 Self-Weight= (thicknessX150)/12 62.5
6 Total Dead Load TDL= DL+PW+FF 137.5
7 Total Factored Uniform Deal Load Wull=TDLX1.4 192.5
8 Total Uniform Load, Wu= (WuLL+WuDL) 260.5
2.3 CHECK ONE WAY OR TWO-WAY SLAB
CHECH ONE & TWO-WAY SLAB:
Panels
No.
Clear Span
in Long
Direction(lb)
Clear Span
in short
Direction(la)
Ration of the length
Bright(lb/la)
Remark
Unit ft ft
Slab-1 11.75 10.42 1.12763916 < 2 So this panel is two way slab design.
Slab-2 12.92 11.75 1.09957447 < 2 So this panel is two way slab design.
Slab-3 11.75 11.17 1.0519248 < 2 So this panel is two way slab design.
Slab-4 14.42 11.5 1.25391304 < 2 So this panel is two way slab design.
Slab-5 15.83 9.67 1.63702172 < 2 So this panel is two way slab design.
26. 26
Slab-6 15.83 10.42 1.51919386 < 2 So this panel is two way slab design.
Slab-7 15.83 10.42 1.51919386 < 2 So this panel is two way slab design.
Slab-8 15.83 9.67 1.63702172 < 2 So this panel is two way slab design.
Slab-9 14.42 11.5 1.25391304 < 2 So this panel is two way slab design.
Slab-10 11.75 11.17 1.0519248 < 2 So this panel is two way slab design.
Slab-11 12.92 11.75 1.09957447 < 2 So this panel is two way slab design.
Slab-12 11.75 10.42 1.12763916 < 2 So this panel is two way slab design.
2.4 SLAB THICKNESS
CHECK FOR SLAB THICKNESS
Penel
e No
Clear Span
in Long
Direction
(lb)
Clear
Span in
short
Direction
(la)
Perimeter
of the
Panel.
P=(la+lb)X2
Thickness
of Slab.
t=(P/180)
X12
Minimum
Thickness
of Slab
Private
Slab
Thickness
t
Effectiv
e
Depth
(d)
Panel
Ratio
(la/lb)
Case
No.
Unit ft ft ft inch inch inch inch ratio Case
Slab-1 11.75 10.42 44.34 2.95 3 5 4 0.89 Case-4
Slab-2 12.92 11.75 49.34 3.29 3.5 5 4 0.91 Case-8
Slab-3 11.75 11.17 45.84 3.05 3.5 5 4 0.96 Case-4
Slab-4 14.42 11.5 51.84 3.45 3 5 4 0.80 Case-4
Slab-5 15.83 9.67 51 3.4 4 5 4 0.62 Case-2
Slab-6 15.83 10.42 52.5 3.5 4 5 4 0.66 Case-8
Slab-7 15.83 10.42 52.5 3.5 3.5 5 4 0.66 Case-8
Slab-8 15.83 9.67 51 3.4 4 5 4 0.62 Case-2
Slab-9 14.42 11.5 51.84 3.45 3 5 4 0.80 Case-4
Slab-
10
11.75 11.17 45.84 3.05 3.5 5 4 0.96 Case-4
Slab-
11
12.92 11.75 49.34 3.29 3.5 5 4 0.91 case-8
Slab-
12
11.75 10.42 44.34 2.95 3 5 4 0.89 Case-4
2.5 All Slab Maximum Moment Ageist Thickness Check:
Plan No Mu(-)a Mu(-)b Effective
Depth (d)La
Effective
Depth (d)Lb
Thickness
La(t)
Thickness
Lb(t)
Slab-1 1741.822 1002.0107 2.759 1.587 3.759 2.587
46. 46
-0.00257 0.75 0.41 1.22 790.56 265.68 1.27 822.96 262.21 OK
-0.18393 0.75 1.22 0.43 278.64 790.56 1.27 822.96 274.82 OK
0.242108 0.75 1.22 0.4 259.2 790.56 1.27 822.96 255.89 OK
-0.00146 0.75 0.64 1.22 790.56 414.2 1.27 822.96 431.71 OK
-0.00273 0.75 0.4 1.22 790.56 259.2 1.27 822.96 255.89 OK
-0.00181 0.75 0.44 1.22 790.56 285.12 1.27 822.96 281.13 OK
-0.00223 0.75 0.7 1.22 790.56 453.6 1.27 822.96 443.58 OK
-0.11561 0.75 1.22 0.71 460.08 790.56 1.27 822.96 449.78 OK
0.184645 0.75 1.22 0.4 259.2 790.56 1.27 822.96 255.89 OK
-0.00169 0.75 0.68 1.22 790.56 440.64 1.27 822.96 431.18 OK
-0.00225 0.75 0.64 1.22 790.56 414.72 1.27 822.96 406.33 OK
0.151291 0.75 1.22 0.65 421.2 790.56 1.27 822.96 412.55 OK
0.303651 0.75 1.22 0.35 226.8 790.56 1.27 822.96 224.27 OK
-0.00164 0.75 0.7 1.22 790.56 453.6 1.27 822.96 453.58 OK
-0.00227 0.75 0.4 1.22 790.56 259.2 1.27 822.96 255.89 OK
-0.15964 0.75 1.22 0.64 414.72 790.56 1.27 822.96 432.21 OK
0.343218 0.75 1.22 0.38 216.24 790.56 1.27 822.96 213.94 OK
-0.0755 0.75 0.57 0.7 453.6 369.36 1.27 822.96 270.5 OK
Design Colum C2 At Ground Floor:
Here,we use reciprocal load equation.Bresler,s reciprocal equation are given below
1/Pn=1/Pnxo+1/Pnyo-1/po
Where,
Pn=approximate value of nominal load in biaxial bending with eccentricity ex
and ey. Pnxo=nominal load when only eccentricity ey is present (cx=0)
Pnyo=nominal load when only eccentricity ex is present (cy=0)
Po=nominal load for concentrically loaded column.
1.5” covering all side
Cx=12-1.5*2=9Cy=18-1.5*2=15
hx=12” hy=18” Ƴx=9/12=.75, Ƴy=15/18=.833
Ag=12*18=216in²use,pg=.03
Main reinforcement,Ast=pg*Ag
-0.00243 0.75 0.7 1.22 790.56 453.6 1.27 822.96 443.58 OK
0.154686 0.75 1.22 0.66 427.68 790.56 1.27 822.96 418.76 OK
0.197782 0.75 1.22 0.41 302.58 790.56 1.27 822.96 298.09 OK
-0.00153 0.75 0.7 1.22 790.56 453.6 1.27 822.69 443.58 OK
Column Size: 12” x 18”
47. 47
=.03*216
=6.48in²
So we use 8#9 bar
For lateral ties we use #3 bar
Spacing is the minimum of-
16db=16*9/8=18”
48tb=48*3/8=18”
12” (Governs)
68. 68
Since the critical condition is the empty tank with outside soil pressure so here will be no
direct tension outside soil will give compression and its effect can be neglected in
reinforcement during since correct itself can take compression.
Ph=0.542
1.
PhL2
12
=
0.542∗152
12
= 10.16 kip/ft
2.
PhB2
12
=
0.542∗102
12
= 4.52 kip/ft
Slab action.
Now use Moment Distribution method.
𝐾𝐿 =
4𝐸𝐼
𝐿
x
1
2
=
4
15∗2
= 0.13
𝐾 𝐵 =
4𝐸𝐼
𝐵
x
1
2
=
4
10∗2
= 0.20
Distribution factor,DF(L)=
0.13
0.13+0.20
= 0.394
M(+)=+ 7.92 kip-ft
M(-)=-7.92 kip-ft
So moment at each corner (Slab action)
Mu= 1.7*7.92 = 13.464 kip-ft
Here, d=10”-3”-0.5” = 6.5”
𝐴 𝑠 =
𝑀𝑢
∅𝑓𝑦(𝑑 −
𝑎
2
)
= 0.497 𝑖𝑛2
𝑎 =
𝐴 𝑠 𝑓𝑦
0.85𝑓′𝑐𝑏
= 0.975 𝑖𝑛𝑐
As mim =0.0018 bt
As mim =0.0018∗12∗10=𝟎.𝟐𝟏𝟔 𝐢𝐧 𝟐
Use #4 bar 𝑎 𝑠 = 0.20 𝑖𝑛2
Spacing, 𝑆 =
𝑜.20
0.497
∗ 12 = 4.82" 𝐶/𝐶
Use of #-4 bar @ 4.5” C/C.
70. 70
OVERHEAD WATER TANK DESIGN
7.5 DESIGN DATA
Water Consumption = 235 lpcd
Volume of water to be stored = 235 lpcd * 12 persons/floor *6 floor
= 235*12*6 =16920 Litre
= (16020/1000)*35.315 = 692.88cft/day
So that Assuming two time in a day if we pump so that the Volume of water per pump can
be Reserved = 692.88/2 = 346.5cft/day
Assume, Length, L=12’
Width, B=7’
Height, H= 4.25’
fy = 60 Ksi
f′c = 3 Ksi
β = 0.85
∅ = 0.90
∈u= 0.003
∈t= 0.005
b=12”
7.6 BASE SLAB DESIGN
ACI Code Minimum Thickness (t) mim=9”
Let’s Assuming Thickness, t=10”
4. Load Calculation
Self weigth,DL=
10
12
∗ 150 = 125 psf
Live Load, LL=20 psf + γwh = 20 + 62.4 ∗ 4.25 = 285.2 psf
Factor Load,Wu= 1.4DL+1.7LL
Wu=1.4*125+1.7*185.2 = 659.84 psf
5. Moment calculation