Design and Analysis of Al Maslamani Building · Project Description Al Maslamani Mall is a...
Transcript of Design and Analysis of Al Maslamani Building · Project Description Al Maslamani Mall is a...
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Design and Analysis of Al Maslamani
Building
Prepared By :
Submitted to : Dr. Mohammad Samaaneh
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Outline:
Introduction.
3D modeling .
Seismic design.
Design and Detailing .
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Project Description
Al Maslamani Mall is a commercial building,
which is located in Beit-Eba Street – Nablus.
The aim of the establishment of this building is
to be used as show rooms and factory of nuts
and sweets.
The project consists of two basement floors,
ground floor and top three floors.
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Al Maslamani Building
.Floor Area (m2) Height (m) Use of floor
Second
basement
1269.8 3.85 Offices and machins
First basement 1269.8 3.6 Offices and stores
Ground 1257.7 5.15 Offices and stores
First 1257.7 4.42 Stores
Second 1238.7 4.42 Stores
Third 1238.7 4.42 Stores
Total 7550 25.86
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Ground Floor consists:
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Basement Floors consists:
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North elevation
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South elevation.
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East elevation
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West elevation
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Soil PropertiesThe type and the characteristics of soil is very
important to be known for designing the footing by
choosing the appropriate type and also for designing
the retaining walls. The soil in the site area is mainly
clay .
The bearing capacity of the soil
qall=2.8Kg/cm2 (280KN/m2 )
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Materials
1) Concrete :-
Property value
Compressive strength of concrete(fc) for slabs
and beams 25Mpa
Compressive strength of concrete(fc) for
columns 30Mpa
Modulus of Elasticity (Ec) 2.35 *104
Unit weight of reinforcing concrete(γ) 25KN/m3
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Materials
2) Reinforcing Steel :-
Property Value
Yield strength(fy) 420Mpa
Modulus of elasticity (Es) 2.04*10^5Mpa
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Codes
ACI 318-08/IBC2009 (American Concrete
Institute): building code requirements of
structural concrete and commentary.
UBC-97 (Uniform Building code).
ASCE (American Society of Civil Engineers).
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Loads
Lateral
Seismic
Gravity
Dead
Live
Superimposed
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LoadsFloor Live Load Superimposed load
Second basement 5 kN /m2 4.7 kN /m2
First basement 5 kN /m2 4.7 kN /m2
Ground Floor 5 kN /m2 4.7 kN /m2
First Floor 5 kN /m2 4.7 kN /m2
Second Floor 5 kN /m2 4.7 kN /m2
Third Floor 5 kN /m2 4.7 kN /m2
Roof floor 10 kN /m2 4.7 kN /m2
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According to ACI 318-09 code required strength
U shall be at least equal to the effects of factored
loads in Eq.
U = 1.4D
U = 1.2D + 1.6L +0.5( Lr or S or R)
U = 1.2D + 1.6( Lr or S or R ) + (1.0L OR 0.5W)
U = 1.2D + 1.0W + 1.0L + 0.5(Lr or S or R)
U = 1.2D + 1.0E + 1.0L + 0.2S
U = 0.9D + 1.0W
U = 0.9D +1.0E
Load combinations
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Two Way solid slab
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Modifiers for each element
Element Modifier
Column 0.7
Beam 0.35
Slab 0.3
Shear wall 0.7
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Verifications of structural analysis
Checks
Compatibility
Deflection
Stress-Strain
Equilibrium
27
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Compatibility of structural model
Time Period =1.008 sec
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Equilibrium
The difference percentage is less than 5%, OK.
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Moments slabFrame Y in ground slab
Stress Strain relationship (internal
equilibrium)
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Take middle span
length of span =8.55m ,From sap M22
M+=371.49KN.m
M-=346.835KN.m
M-= 341.242 KN.m
Moments 3D Sap = 𝟑𝟒𝟔.𝟖𝟑𝟓+𝟑𝟒𝟏.𝟐𝟒
𝟐+ 371.49 = 715.52KN.m
Moments for frame Y from Sap in 3D
1.Moments slab
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Moment Hand = 𝑊𝑢 ∗𝐿2
8
Wu for column strip =1.2(Wd+ Wsd)+1.2(Wd beam) + 1.6(WL)
width of column strip =3.7
Wu = 1.2((5+4.7)3.7) +(1.2*6) + 1.6(5*3.7)
Wu=79.87 KN/m
Moment hand=𝟕𝟗.𝟖𝟕 ∗8.552
8= 729.83 KN.m
%error = 729.83−715.52
729.83= 2%
The difference percentage is 2 %, which is less than 10%, OK.
Moments slab for column strip
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Max deflection in floor
Check deflection for slab
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Deflection in slab
Max deflection in critical panel for column
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Long-term deflection:
Assume 50% sustained live load.
The long-term deflection is given by the following equation:
Δ Long term = ΔL+ λ∞. ΔD+ λt ΔSL
Δslab= max deflection–(average deflection column+ average deflection beam)
ΔDead= 10.48- (1.38+1.59+1.62+0.97
4+3.73+3.8+3.34+5.33
4) =5.04 mm
Δ SD = 8.427-(𝟎.𝟓𝟖𝟕+𝟎.𝟑𝟕+𝟎.𝟔𝟗+𝟎.𝟕𝟎𝟕
𝟒+2.28+2.37+1.97+3.47
4) =5.316 mm
Δ Live= 9 - (𝟏.𝟐𝟒𝟗+𝟏.𝟐𝟐𝟔+𝟎.𝟔𝟔+𝟏.𝟎𝟑𝟐
𝟒+
𝟐.𝟖𝟏+𝟐.𝟑𝟗+𝟐.𝟕𝟒+𝟒.𝟎𝟗
𝟒)= 4.95mm
Δ (Total dead) = 5.04+5.316= 10.356mm.
Δ (Live) = 4.95 mm
Check deflection for slab
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Δ (Total dead) = 5.04+5.316= 10.356mm.
Δ (Live) = 4.95 mm.
λ∞.=λt = 2
Δ Long term = ΔL+ λ∞. ΔD+ λt ΔSL
Δ Long term =4.95+2(10.356)+24.95
2= 30.612mm
Δ allowable= 𝐿
240=
8.55
240=0.0356m = 35.62 mm
Δ Long term 30.612mm < Δ allowable ok
Δ Long term = ΔL+ λ∞. ΔD+ λt ΔSL
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Seismic Design
Parameters
Design according to UBC-97 code.
Soil profile type: Stiff soil profile SD
Zone factor: By using Palestine seismic map the
zone factor Z for Nablus city is 2B thus, Z=0.2
Seismic coefficients: Ca and Cv
Ca =0.28 Table 16-Q in UBC
Cv = 0.4 Table 16-R in UBC
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Seismic Design
Parameters Importance factor [I]: I=1
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Seismic Design
Parameters
Response modification factor R=5.5
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Using response spectrum to
determine the design base shear
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Define equivalent static in Y-direction
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Define equivalent static in x-direction
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Define mass source(super imposed load).
Seismic Design
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Seismic Design
check period by using Method A formula:
T = 0.0731* (25.87) ¾
T=0.83sec
Verification for Earth Quake
T = Ct*H3/4
Where: Ct =0.03(0.0731) for moment resistant concrete frames
1. Check Period
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Period from SAP
Verification for Earth Quake
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Seismic Design
Results:period from SAP should be ≤ 1.3T(method A)
1.3T(method A) =1.3*(0.83) =1.079 sec
From SAP
Period ( Tn sec)
In x-direction
Period ( Tn sec)
In Y-direction
0.487 1.008
Verification for Earth Quake
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2.Modal participation mass ratio in X and Y >
Verification for Earth Quake
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3.Check drift, P– Δ effect,
The time of structure is greater than 0.7 sec, the calculated story drift shall not exceed 0.020 times the story height.
Δ allowable = 𝐿
50=
4.42
50*1000 =88.4mm
In X direction
From SAP >> ΔS = 2.3mm
ΔM=0.7*R * ΔS
ΔM = 0.7*5.5*2.3 =8.85 mm
ΔM < Δallowable
In Y direction
From SAP >> ΔS = 25.1mm
ΔM=0.7*R * ΔS
ΔM = 0.7*5.5*5.1 =19.6 mm
ΔM < Δallowable
Verification for Earth Quake
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Seismic Design
V = 𝐶𝑣𝐼
𝑅𝑇𝑤 , this value must be between:
Max: V = 2.5 𝐶𝑎𝐼
𝑅𝑤
Min: V = 0.11 Ca I W
Determine of Base Shear
Verification for Earth Quake
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Base shear Calculations
In X direction
Cs=0.15
Cs max =0.1272
Cs min =0.0308
Cs min< Cs >Cs max
Base shear (V) = 0.1272 *122214.285 = 15545.65kN. `
In Y direction Cs=0.072
Cs max =0.1272
Cs min =0.0308
Cs min < Cs < Cs max OK.
Base shear (V)= 0.072 *122214.285 =8799.4kN.
Seismic Design
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Seismic Design
Base shear in y-direction
(kN)
Base shear in x-direction
(kN)From SAP
8810.36215554.455
BaseshearResults From SAP
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Definition of Response Spectrum Function
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Definition of Response Spectrum Function
Scale factor: 𝐼∗𝑔
𝑅I: Importance factor = 1
g: Gravity acceleration = 9.81 m/s2
R: Response Modification Coefficient.
Note :
for each direction there must be
a component of 30% from the perpendicular direction.
As a requirement from UBC-97 :
response spectrum base shear is (85- 100) % of the base shear
determined in equivalent static method. So modify scale factor:
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Scale Factor
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Scale Factor
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Seismic Design
Base shear Static in X direction = 15545.65kN.
Base shear Static in Y direction = 8799.4kN.
Base shear in y-direction
(kN)
Base shear in x-direction
(kN)From SAP
8921.36215966.27
After modifications the value of base shear from response analysis is
greater than the value from static calculations.
Base shear Results From SAP
Note :
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Design and detailing
Structural elements:
Slab
Beams
Shear wall
Columns
Footing
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ØVc= 0.75∗ 25∗1000∗160
6= 100 kN
Vu13, max from sap= 40.322kN
Slab design & detailing
Check Slab thickness
Vu23, max from sap = 34.268kN
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𝐴𝑠,𝑚𝑖𝑛 = 0.0018 ∗ 𝑏 ∗ 𝑑 = 0.0018 ∗ 1000 ∗ 160 = 288 mm2
⟹ 𝑢𝑠𝑒 4ø12/m
Note:
4ø12/m is used in regions with moment 26.6kN.mwhenever the
moment is greater than this additional steel is used .
Slab design & detailing
Reinforcement:
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Slab design
Slab Detailing :
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Check slenderness:
Need to find Moments of inertia for sections are:
For interior column in group 2:
Diameter of column = 800 mm
For Beam T (0.8*0.4)Ig=0.0272m4
For column (D=0.8) Ig=0.0201m4
E for column=4700 30 = 25742.96 Mpa
E for Beam=4700 25 = 23500 Mpa
Columns design & detailing
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φA =0 Because support of column is Fixed
φB =1.654
For Sway Frame
K=1.22
Neglect slenderness if kLu
r≤ 22
Lu= (3.88-(0.8
2)) =3.48 m
KLu
r=
1.22∗3.48
0.25(0.8)= 21.2
Then the column is non slender
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Reinforcement
The value of longitudinal reinforcement from SAP: 17Φ22
Spiral spaces :
S=4 Asp
ρs Dc=< 75 mm
We use Φ=10mm for spiral s
Asp = 78.5 mm2
Dc = 800-120 = 680mm
ρs= 0.45 (Ag
Ach-1)
fc
fy
Ag = 502654.8 mm2
Ach = π
4DC
2 = 363168 mm2
ρs = 0.0123
S = 37.5 mm < 75mm
∴ Use 1Φ10 / 60 mm for spiral
Columns design & detailing
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Columns design & detailing
Column detail:
Column
Name
Column
Dimension
Number of
Bars Ls=1.3Ld
Spacing
between
Spiral
C2 D=80 mm 17Ø22 1.2 m 6 cm
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ls
l0
s1
s0s0/2
l0
s0s0/2
General Detailing and design according code UBC97
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Beams design & detailingBeam design:
Vu= 313.207 KN.
Check Slab thickness
ØVc = 190 KN.
𝐴𝑣
𝑠= 0.514
VS= 164.6 kN
Vu > ØVc So need Shear reinforcement
𝑆 = 31𝑐𝑚
𝑆1 = 1 4𝑐𝑚
𝑆2 = 35𝑐𝑚
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Beam detailing :
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Shear wall design & detailing
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Shear wall design & detailing
Internal forces:
section cut in shear wall 1
Shear wall design:
Thickness= 200mm
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Shear wall design & detailing
Total longitudinal reinforcement =As from My+ As from Mx
Total longitudinal reinforcement=346*2+1650=2342 mm^2
For horizontal steel from Vuy =540.5kN
Use longitudinal reinforcement 4Ø12/m on each side
Use horizontal steel use 2ø12/350mm
Shear wall detailing:
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Axial and Flexural: interaction diagram
Shear wall design & detailing
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Shear wall detailing:
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The dimension in X-direction =41m
The dimension in Y-direction= 42m
Thickness assumed :700mm
Mat foundation design & detailing
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Verifications
1-Check deflection
max deflection =4mm < Δ allowable 10mm
No need to increase dimensions.
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2-Check bearing capacity of soil
Maximum bearing capacity for mat foundation =112 kN/m2< qall=280kN/m^2
So no need to increase dimension of mat foundation.
Verifications
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3- Check Punching shear:
All values of 𝑉𝑢
∅𝑣𝑐< 1
So the punching shear is ok & no need to increase the dimension of the mat foundation.
Verifications
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4-Check wide beam shear:
ØVc = 0.75∗ 25∗1000∗640
6= 400 kN
From SAP maximum pressure= 157.7 kN/m2
Vu = 𝑤𝑢∗𝐿
2=
157.7∗3
2= 236.55 kN
Vu < ØVc, so the check of wide beam shear is OK.
Note :
After verification the dimensions founded to be
adequate:
Verifications
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Mat design & detailing
As min = 0.0018*630*1000= 1134 mm2 ⟹𝒖𝒔𝒆 𝟓ø18/m
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Mat design & detailing
Additional Steel under Columns
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Mat design & detailing
Sections in mat
foundation
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Detailing for stairs
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