performence check for building designed with nbc, is
TRANSCRIPT
8/2/2019 Performence Check for Building Designed With NBC, Is
http://slidepdf.com/reader/full/performence-check-for-building-designed-with-nbc-is 1/72
Check for Performance of Building
Designed with NBC and IS Codes
8/2/2019 Performence Check for Building Designed With NBC, Is
http://slidepdf.com/reader/full/performence-check-for-building-designed-with-nbc-is 2/72
TASKS
• Study of IAEE Manual( Guidelines for EarthquakeResistant Non-Engineered Construction)
• Comments on Existing NBC 205
•
Nonlinear static analysis of Building designed withNBC 205,105 and IS 1893,2002 for life safety
criteria
• Recommendations for further work
8/2/2019 Performence Check for Building Designed With NBC, Is
http://slidepdf.com/reader/full/performence-check-for-building-designed-with-nbc-is 3/72
Methodology Select Building
Code
NBC 205 NBC 105/IS 1893,2002
Prepare Analysis
Building Model
Analyze building and design as
per selected code
Select Design load level and Load
factors from Selected code
Produce Beam and column Reinforcement detailing
8/2/2019 Performence Check for Building Designed With NBC, Is
http://slidepdf.com/reader/full/performence-check-for-building-designed-with-nbc-is 4/72
Methodology
Determine, Capacity
Curve, Demand Curve
and Performance point
Development of Pushover
hinges for Beam and column
Nonlinear Static ,Pushoveranalysis
Select Codal Response spectra and
evaluate Spectra parameter Ca, Cv
Repeat the whole process
till satisfaction of Life
safety criteria
Life
safety
Criteria?
Does not
Meet
Increase design force level,
Modification in codal
provision
8/2/2019 Performence Check for Building Designed With NBC, Is
http://slidepdf.com/reader/full/performence-check-for-building-designed-with-nbc-is 5/72
Methodology
Determine, Capacity
Curve, Demand Curve
and Performance point
Repeat Nonlinear Static,Pushover analysis
Upgrade Codal Response spectra and
evaluate Spectra parameter Ca, Cv
Repeat the whole
process till satisfaction
of Life safety criteria
Need to upgrade
performance
level?
Does notMeet
Increase design force
level,
Modification in codal
provision
Life
safety
Criteria
Recommend New Design Response spectrum
curve and load factors
Use this spectra for
design of representative
nos of models
Compile detailing outputs
And recommend in NBC
205
No Use Codal spectra
for design of
representative nosof models
Compile detailing
outputs
And recommend
in NBC 205
8/2/2019 Performence Check for Building Designed With NBC, Is
http://slidepdf.com/reader/full/performence-check-for-building-designed-with-nbc-is 6/72
Nonlinear Static Pushover analysis
Push-over Curve
Load Vs. DeflectionVb
UN
UN F
Vb
8/2/2019 Performence Check for Building Designed With NBC, Is
http://slidepdf.com/reader/full/performence-check-for-building-designed-with-nbc-is 7/72
Analysis Building Model
4.5 m
3.5 m
3.35 m
5X 3 Bays
Vertical Loadings are confirming to
NBC 102, 103
Steel :Fe 415
8/2/2019 Performence Check for Building Designed With NBC, Is
http://slidepdf.com/reader/full/performence-check-for-building-designed-with-nbc-is 8/72
Performance check for Building
Detailed with NBC 205
8/2/2019 Performence Check for Building Designed With NBC, Is
http://slidepdf.com/reader/full/performence-check-for-building-designed-with-nbc-is 9/72
Beam Detailing , NBC 205
8/2/2019 Performence Check for Building Designed With NBC, Is
http://slidepdf.com/reader/full/performence-check-for-building-designed-with-nbc-is 10/72
Beam Detailing , NBC 205
Beam Size: 230 X 325
8/2/2019 Performence Check for Building Designed With NBC, Is
http://slidepdf.com/reader/full/performence-check-for-building-designed-with-nbc-is 11/72
Column Detailing, NBC 205
8/2/2019 Performence Check for Building Designed With NBC, Is
http://slidepdf.com/reader/full/performence-check-for-building-designed-with-nbc-is 12/72
NBC 205, Column Detailing
8/2/2019 Performence Check for Building Designed With NBC, Is
http://slidepdf.com/reader/full/performence-check-for-building-designed-with-nbc-is 13/72
Pushover Hinges; beam moment
A
B
C
D
E
M/My
Curvature/SF
Yield Moment, My : From Analysis of section with Material partial factor of safety = 1
Steel ultimate strength = 1.25*steel yield strength
Hysteresis Type: Isotropic
8/2/2019 Performence Check for Building Designed With NBC, Is
http://slidepdf.com/reader/full/performence-check-for-building-designed-with-nbc-is 14/72
Column Hinge
• Column hinge is based up on Interaction diagram of
column
• Removing partial factor of safety for concrete and steel
•
Ultimate strength of steel = 1.25*yield strength{ Fema356}
8/2/2019 Performence Check for Building Designed With NBC, Is
http://slidepdf.com/reader/full/performence-check-for-building-designed-with-nbc-is 15/72
Selection of Response Spectra
8/2/2019 Performence Check for Building Designed With NBC, Is
http://slidepdf.com/reader/full/performence-check-for-building-designed-with-nbc-is 16/72
300 YRS Return Period PGA Distributions
8/2/2019 Performence Check for Building Designed With NBC, Is
http://slidepdf.com/reader/full/performence-check-for-building-designed-with-nbc-is 17/72
Response Spectra Parameter: Ca, Cv
Ground Acceleration, Ca = 0.32gStructural Response ,Acceleration at 1 sec, Cv =0.4g
0.32 g
0.32 g*2.5 =0.8g
0.32 g*2.5/2 =0.4 g
NBC Fits Response spectra with IS
Response spectra:
8/2/2019 Performence Check for Building Designed With NBC, Is
http://slidepdf.com/reader/full/performence-check-for-building-designed-with-nbc-is 18/72
Pushover Analysis Output, PUSH X
Just before Structural instability:
Total nos of elastic hinge: 198 Nos
Total Immediate occupancy Hinge: 114 Nos
Total life safety hinge: 6 nos
Total Collapse prevention hinge: 14 Nos
Column Need to be strong for avoiding Collapse prevention hinge in
column
IO LS
8/2/2019 Performence Check for Building Designed With NBC, Is
http://slidepdf.com/reader/full/performence-check-for-building-designed-with-nbc-is 19/72
ATC 40, Global Building Acceptability
Limits
0.33*0.08 =0.0264
0.01*10050 =100.5 mm 100.5mm to 201 mm
Top Story Displacementlimits
265.32 mm
8/2/2019 Performence Check for Building Designed With NBC, Is
http://slidepdf.com/reader/full/performence-check-for-building-designed-with-nbc-is 20/72
ATC 40 Capacity Spectrum;
Earthquake: 300 Years of Return period
Earthquake: 300 years Return period
Target base shear: 923.544 KN
Target Displacement: 127.27 mm
Corresponding Inter story Drift: 127.27/(10050)=0.013 < 0.02( Damage control,0.01 to 0.02)
Life Safety Limit is ensured for 300 Years Return period
Push X
8/2/2019 Performence Check for Building Designed With NBC, Is
http://slidepdf.com/reader/full/performence-check-for-building-designed-with-nbc-is 21/72
PUSHX, Capacity Curve and Elastic Response
L
S
L
C
P
LE
I
D
I
0
L Ductility Demand > Available Ductility
=> For Higher earthquake there will be
no ductility
8/2/2019 Performence Check for Building Designed With NBC, Is
http://slidepdf.com/reader/full/performence-check-for-building-designed-with-nbc-is 22/72
Pushover Analysis Output, PUSH Y
Just before Structural instability:
Total nos of elastic hinge: 204 Nos
Total Immediate occupancy Hinge: 24 Nos
Total life safety hinge: 2 nos
Total Collapse prevention hinge: 30 Nos
Column Need to be strong for avoiding Collapse prevention
hinge
IO LS
8/2/2019 Performence Check for Building Designed With NBC, Is
http://slidepdf.com/reader/full/performence-check-for-building-designed-with-nbc-is 23/72
ATC 40, Capacity Spectrum
Earthquake: 300 Years of Return period
Earthquake: 300 years Return period
Target base shear: 929.51 KN
Target Displacement: 125.561 mm
Corresponding Inter story Drift: 125.561/(10050)=0.0125 < 0.02( Damage control,0.01 to 0.02)
Life Safety Limit is ensured for 300 Years Return period
8/2/2019 Performence Check for Building Designed With NBC, Is
http://slidepdf.com/reader/full/performence-check-for-building-designed-with-nbc-is 24/72
PUSHY Capacity Curve and
Elastic response
L
S
L
C
P
LEI
D
I
0
LDuctility Demand > Available Ductility
=> For Higher earthquake there will be
no ductility
8/2/2019 Performence Check for Building Designed With NBC, Is
http://slidepdf.com/reader/full/performence-check-for-building-designed-with-nbc-is 25/72
Check For NBC205 Designed Building
For 500 YRS RP Earthquake
8/2/2019 Performence Check for Building Designed With NBC, Is
http://slidepdf.com/reader/full/performence-check-for-building-designed-with-nbc-is 26/72
26
500 YRS RP Ground Acceleration
Distributions
8/2/2019 Performence Check for Building Designed With NBC, Is
http://slidepdf.com/reader/full/performence-check-for-building-designed-with-nbc-is 27/72
27
8/2/2019 Performence Check for Building Designed With NBC, Is
http://slidepdf.com/reader/full/performence-check-for-building-designed-with-nbc-is 28/72
500 Yrs Response Spectra Parameter: Ca, Cv
Ground Acceleration, Ca = 0.36gStructural Response, Acceleration at 1 sec, Cv
=0.45g
0.36 g
0.36 g*2.5 =0.9g
0.36 g*2.5/2 =0.45g
8/2/2019 Performence Check for Building Designed With NBC, Is
http://slidepdf.com/reader/full/performence-check-for-building-designed-with-nbc-is 29/72
ATC40 Capacity Spectra for 500 yrs return period
Earthquake
Capacity Curve and Demand curve do not meet:
This is due to formation of collapse prevention
hinges in columns and high seismic loading both
PUSH X
8/2/2019 Performence Check for Building Designed With NBC, Is
http://slidepdf.com/reader/full/performence-check-for-building-designed-with-nbc-is 30/72
ATC40 Capacity Spectra for 500 yrs return
period Earthquake
PUSH X
Capacity Curve and Demand curve do not meet:
This is due to formation of collapse prevention
hinges in columns and high seismic loading both
8/2/2019 Performence Check for Building Designed With NBC, Is
http://slidepdf.com/reader/full/performence-check-for-building-designed-with-nbc-is 31/72
Check for Performance of NBC105
Designed Building :
300 YRS RP Earthquake ResponseSpectra
8/2/2019 Performence Check for Building Designed With NBC, Is
http://slidepdf.com/reader/full/performence-check-for-building-designed-with-nbc-is 32/72
NBC 105, Seismic Load
8/2/2019 Performence Check for Building Designed With NBC, Is
http://slidepdf.com/reader/full/performence-check-for-building-designed-with-nbc-is 33/72
NBC 105, Seismic Force Distribution
54.55 KN
218.21 KN
304.03 KN
8/2/2019 Performence Check for Building Designed With NBC, Is
http://slidepdf.com/reader/full/performence-check-for-building-designed-with-nbc-is 34/72
NBC105;
End Beam
Design
Output
Beam:
230 X 350
8/2/2019 Performence Check for Building Designed With NBC, Is
http://slidepdf.com/reader/full/performence-check-for-building-designed-with-nbc-is 35/72
Column Design Output, NBC105
8/2/2019 Performence Check for Building Designed With NBC, Is
http://slidepdf.com/reader/full/performence-check-for-building-designed-with-nbc-is 36/72
Response Spectra Parameter: Ca, Cv For 300 YRS RP
Ground Acceleration, Ca = 0.32g
Structural Response ,Acceleration at 1 sec, Cv
=0.4g
0.32 g
0.32 g*2.5 =0.8g
0.32 g*2.5/2 =0.4 g
8/2/2019 Performence Check for Building Designed With NBC, Is
http://slidepdf.com/reader/full/performence-check-for-building-designed-with-nbc-is 37/72
ATC 40, Capacity Spectrum
Earthquake: 300 Years of Return period
PUSH X Output
Earthquake: 300 years Return period
Target base shear: 1314.596 KN
Target Displacement: 92 mm
Corresponding Inter story Drift: 92/(10050)=0.01 < 0.02( Damage control,0.01 to 0.02)
Life Safety Limit is ensured for 300 Years Return period
8/2/2019 Performence Check for Building Designed With NBC, Is
http://slidepdf.com/reader/full/performence-check-for-building-designed-with-nbc-is 38/72
Pushover Analysis Output, PUSH X
Just before Structural instability:
Total nos of elastic hinge: 158 Nos
Total Immediate occupancy Hinge: 124 Nos
Total life safety hinge: 68 nosTotal life safety to collapse prevention hinge: 18 nos
Total Unstable hinge: 4 Nos
Column Need to be strong for avoiding Collapse prevention
hinge
IO LS
8/2/2019 Performence Check for Building Designed With NBC, Is
http://slidepdf.com/reader/full/performence-check-for-building-designed-with-nbc-is 39/72
Capacity Curve and Elastic Response
L
S
L
E
I
D
I
0
L
Ductility Demand> Available Ductility=> For Higher earthquake there will be no
ductility
Same as recommended in
Seismic hazard mapping and
risk assessment for Nepal
8/2/2019 Performence Check for Building Designed With NBC, Is
http://slidepdf.com/reader/full/performence-check-for-building-designed-with-nbc-is 40/72
ATC 40, Capacity Spectrum
Earthquake: 300 Years of Return period
Earthquake: 300 years Return period
Target base shear: 1315.983 KN
Target Displacement: 91 mm
Corresponding Inter story Drift: 91/(10050)=0.01 < 0.02( Damage control,0.01 to 0.02)
Life Safety Limit is ensured for 300 Years Return period
PUSH Y Output
8/2/2019 Performence Check for Building Designed With NBC, Is
http://slidepdf.com/reader/full/performence-check-for-building-designed-with-nbc-is 41/72
Capacity Curve and Elastic Response
L
S
L
E
I
D
I
0
L
Ductility Demand> Available Ductility
=> For Higher earthquake there will be no
ductility
Same as recommended in
Seismic hazard mapping and
risk assessment for Nepal
8/2/2019 Performence Check for Building Designed With NBC, Is
http://slidepdf.com/reader/full/performence-check-for-building-designed-with-nbc-is 42/72
Check For NBC 105 Designed Building
For 500 YRS RP Earthquake
8/2/2019 Performence Check for Building Designed With NBC, Is
http://slidepdf.com/reader/full/performence-check-for-building-designed-with-nbc-is 43/72
500 Yrs Response Spectra Parameter: Ca, Cv
Ground Acceleration, Ca = 0.36gStructural Response, Acceleration at 1 sec, Cv
=0.45g
0.36 g
0.36 g*2.5 =0.9g
0.36 g*2.5/2 =0.45g
8/2/2019 Performence Check for Building Designed With NBC, Is
http://slidepdf.com/reader/full/performence-check-for-building-designed-with-nbc-is 44/72
ATC40 Capacity Spectra for 500 yrs return
period Earthquake
PUSH X
8/2/2019 Performence Check for Building Designed With NBC, Is
http://slidepdf.com/reader/full/performence-check-for-building-designed-with-nbc-is 45/72
ATC40 Capacity Spectra for 500 yrs return
period Earthquake
PUSH Y
Performance point does not meet in Y direction
Buildings designed for 300 YRS RP is Not safe in 500 YRS RP Earthquake
Demand curve above capacity curve indicates need of increase in design force level
Performance point
Not available
8/2/2019 Performence Check for Building Designed With NBC, Is
http://slidepdf.com/reader/full/performence-check-for-building-designed-with-nbc-is 46/72
Check For Modified NBC 105 DesignedBuilding For 500 YRS RP Earthquake
Proposed Modification in NBC 105
Considers Basic seismic Coefficient of
0.09 instead of 0.08
8/2/2019 Performence Check for Building Designed With NBC, Is
http://slidepdf.com/reader/full/performence-check-for-building-designed-with-nbc-is 47/72
Proposed Response spectrum: 10% in 50 years( 500 YRS RP)
Short period spectral acceleration: 0.9 g
Ground acceleration: 0.36 g
1 Sec , Spectral acceleration : 0.45 g
8/2/2019 Performence Check for Building Designed With NBC, Is
http://slidepdf.com/reader/full/performence-check-for-building-designed-with-nbc-is 48/72
500 Yrs Response Spectra Parameter: Ca, Cv
Ground Acceleration, Ca = 0.36gStructural Response, Acceleration at 1 sec, Cv
=0.45g
0.36 g
0.36 g*2.5 =0.9g
0.36 g*2.5/2 =0.45g
C= Ct*Z*I*K= 0.09
Load factors are remains
as it is
0.045/T
0.09/T0.09
0.036/T
8/2/2019 Performence Check for Building Designed With NBC, Is
http://slidepdf.com/reader/full/performence-check-for-building-designed-with-nbc-is 49/72
Seismic Load
NBC 105, Modified Response spectra
8/2/2019 Performence Check for Building Designed With NBC, Is
http://slidepdf.com/reader/full/performence-check-for-building-designed-with-nbc-is 50/72
Seismic Load Distribution
61.37 KN
245.48 KN
342.04 KN
8/2/2019 Performence Check for Building Designed With NBC, Is
http://slidepdf.com/reader/full/performence-check-for-building-designed-with-nbc-is 51/72
Beam Design output
Beam 230X350
8/2/2019 Performence Check for Building Designed With NBC, Is
http://slidepdf.com/reader/full/performence-check-for-building-designed-with-nbc-is 52/72
Column Design Output
8/2/2019 Performence Check for Building Designed With NBC, Is
http://slidepdf.com/reader/full/performence-check-for-building-designed-with-nbc-is 53/72
ATC40 Capacity Spectra for 500 yrs return period
Earthquake
Earthquake: 500 years Return period
Target base shear: 1636.357 KN
Target Displacement: 103.403 mm
Corresponding Inter story Drift: 103.403/(10050)=0.01 < 0.02( Damage control,0.01 to 0.02)
Life Safety Limit is ensured for 500 Years Return period
PUSH X
8/2/2019 Performence Check for Building Designed With NBC, Is
http://slidepdf.com/reader/full/performence-check-for-building-designed-with-nbc-is 54/72
PUSH X , Output
Just before Structural instability:
Total nos of elastic hinge: 154 Nos
Total Immediate occupancy Hinge: 124 Nos
Total life safety hinge: 74 nos
Total life safety to collapse prevention hinge: 10 nos
Total Unstable hinge: 10 Nos
Column Need to be strong for avoiding Collapse prevention
hinge
IO LS
8/2/2019 Performence Check for Building Designed With NBC, Is
http://slidepdf.com/reader/full/performence-check-for-building-designed-with-nbc-is 55/72
Capacity Curve and Elastic Response
L
S
L
E
I
D
I
0
L
Ductility Demand> Available Ductility
=> For Higher earthquake there will be no
ductility
8/2/2019 Performence Check for Building Designed With NBC, Is
http://slidepdf.com/reader/full/performence-check-for-building-designed-with-nbc-is 56/72
8/2/2019 Performence Check for Building Designed With NBC, Is
http://slidepdf.com/reader/full/performence-check-for-building-designed-with-nbc-is 57/72
PUSH X , Output
Just before Structural instability:
Total nos of elastic hinge: 168 Nos
Total Immediate occupancy Hinge: 106 Nos
Total life safety hinge: 74 nos
Total life safety to collapse prevention hinge: 14 nos
Total Unstable hinge: 10 Nos
Column Need to be strong for avoiding Collapse prevention
hinge
IO LS
8/2/2019 Performence Check for Building Designed With NBC, Is
http://slidepdf.com/reader/full/performence-check-for-building-designed-with-nbc-is 58/72
Building with Additional , SCWB Satisfying condition
500 YRS Return period 1000 YRS Return period
300 YRS Return Period
Strong column Weak beam condition
improves linear ductility
8/2/2019 Performence Check for Building Designed With NBC, Is
http://slidepdf.com/reader/full/performence-check-for-building-designed-with-nbc-is 59/72
Check for performance level for IS
1893,2002 Designed Building
500 YRS RP Response Spectra
8/2/2019 Performence Check for Building Designed With NBC, Is
http://slidepdf.com/reader/full/performence-check-for-building-designed-with-nbc-is 60/72
500 Years Return period
IS 1893, 2002, Response spectra
0.36 g
0.45 g
8/2/2019 Performence Check for Building Designed With NBC, Is
http://slidepdf.com/reader/full/performence-check-for-building-designed-with-nbc-is 61/72
Response Spectra Parameter: Ca, Cv
Ca =0.36Cv=0.45
8/2/2019 Performence Check for Building Designed With NBC, Is
http://slidepdf.com/reader/full/performence-check-for-building-designed-with-nbc-is 62/72
Evaluation of Seismic Static Load:• Seismic wt, W =Wt of the
building due to DL+0.25LL
• Base shear = Ah* W
• W= W1+W2+W3
• Z = zone factor
• I =Importance factor
• R = response reduction factor
• Sa/g = Spectral acceleration
coefficients
8/2/2019 Performence Check for Building Designed With NBC, Is
http://slidepdf.com/reader/full/performence-check-for-building-designed-with-nbc-is 63/72
S i i F Di t ib ti
8/2/2019 Performence Check for Building Designed With NBC, Is
http://slidepdf.com/reader/full/performence-check-for-building-designed-with-nbc-is 64/72
Seismic Force Distribution
61.4 KN
245.5 KN
342.0 KN
ATC40 Capacity Spectra for 500 yrs return
8/2/2019 Performence Check for Building Designed With NBC, Is
http://slidepdf.com/reader/full/performence-check-for-building-designed-with-nbc-is 65/72
ATC40 Capacity Spectra for 500 yrs return
period Earthquake
PUSH X
Earthquake: 500 years Return period
Target base shear: 1973.06 KN
Target Displacement: 104.0 mm
Corresponding Inter story Drift: 104.0/(10050)=0.01 < 0.02( Damage control,0.01 to 0.02)
Life Safety Limit is ensured for 500 Years Return period
8/2/2019 Performence Check for Building Designed With NBC, Is
http://slidepdf.com/reader/full/performence-check-for-building-designed-with-nbc-is 66/72
C it C d El ti R
8/2/2019 Performence Check for Building Designed With NBC, Is
http://slidepdf.com/reader/full/performence-check-for-building-designed-with-nbc-is 67/72
Capacity Curve and Elastic Response
Ductility Demand is very close to Available
Ductility but still lacking in ductility
Conclusion
8/2/2019 Performence Check for Building Designed With NBC, Is
http://slidepdf.com/reader/full/performence-check-for-building-designed-with-nbc-is 68/72
Conclusion
• Building Detailed with NBC 205
– Meets life safety criterion for 300
– No global linear ductility for higher earthquake
– Failure in 500 Yrs RP Earthquake
Conclusion
8/2/2019 Performence Check for Building Designed With NBC, Is
http://slidepdf.com/reader/full/performence-check-for-building-designed-with-nbc-is 69/72
Conclusion
• Building Detailed with NBC 105
– Meets life safety criterion for 300
– No global linear ductility for higher earthquake
– Failure in 500 Yrs RP Earthquake
8/2/2019 Performence Check for Building Designed With NBC, Is
http://slidepdf.com/reader/full/performence-check-for-building-designed-with-nbc-is 70/72
Conclusion
• Building Designed with Modified NBC 105 Response
spectra
– Life safety criteria meets for 500 YRS RP Earthquake
– Needs more global ductility for ensuring collapse
prevention for higher earthquake
8/2/2019 Performence Check for Building Designed With NBC, Is
http://slidepdf.com/reader/full/performence-check-for-building-designed-with-nbc-is 71/72
Recommendations
•
Replace 300 Yrs Response spectra with 500 yrsResponse spectra in NBC 105
• Add additional clause for strong column weak beamfor ensuring collapse prevention in higher earthquake
• Use modified NBC 105 for the analysis of Samplebuildings belongs to NBC 205
• Develop summary of detailing and replace old Existingdetailing