structural design of tall buildings in the philippines...
TRANSCRIPT
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Structural Design of Tall Buildings in the PhilippinesUs ing Performance-Based Des ign Approach
Sysquared & Associates, Inc.
E a r l P . B o n i t a
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A G E N D A
01. Alternative Method of Analysis
02. Codes and References
03. General Approach in PBD
04. PBD Projects in the Philippines
05. Remarks
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ALTERNATIVE METHOD OF ANALYSIS
Performance-Based Design
Modern approach
Non-prescriptive
Meet performance objectives
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CODES AND REFERENCES
LATBSDC Los Angeles Tall Buildings Structural Design Council
PEER Pacific Earthquake Engineering Research Center
TBI Tall Buildings Initiative
ASCE 41 Seismic Rehabilitation of Existing Buildings
ASCE 7 Minimum Design Loads for Buildings and Other
Structures
ACI 318 Building Code Requirements for Structural Concrete
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GENERAL APPROACH IN PBD
1. Initial Analysis: Code-Based Design
1.1. SLE
1.2. DBE
1.3. Wind from code
2. Final Analysis: Performance-Based Design
2.1. Wind from wind tunnel
2.2. MCE from site specific
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GENERAL APPROACH IN PBD
FUGRO Site Specific
Study
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GENERAL APPROACH IN PBD
RWDI Wind Tunnel Study
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GENERAL APPROACH IN PBD
Seismic Performance Objectives
Level of Earthquake Performance Objective
Frequent/Service: 50% probability of
exceedance in 50 years (72-year
return)
Serviceability: Negligible damage in once-
in-a-lifetime earthquake. Structure to
remain essentially elastic with minor
damage to structural and non-structural
elements
Design Basis Earthquake (DBE): 10%
probability of exceedance in 50 years
(475-year return)
Code Level: Moderate structural damage;
extensive repairs may be required
Maximum Considered Earthquake
(MCE): 2% probability of exceedance
in 50 years(2500-year return)
Collapse Prevention: Extensive structural
damage; repairs are required and may not
be economically feasible
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Uniform Hazard Spectra
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
0 1 2 3 4 5 6 7 8 9 10
Spec
tral
Acc
eler
atio
n, S
a (g
)
Natural Period (sec)
Response Spectra
SLE
DBE
MCE
GENERAL APPROACH IN PBD
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Seven Ground Motions used in NLTHA
-3.00E-01
-2.00E-01
-1.00E-01
0.00E+00
1.00E-01
2.00E-01
3.00E-01
0 10 20 30 40 50 60
EL SALVADOR, 2001, MAGNITUDE 7.6
AJC_090
-2.50E-01
-2.00E-01
-1.50E-01
-1.00E-01
-5.00E-02
0.00E+00
5.00E-02
1.00E-01
1.50E-01
2.00E-01
2.50E-01
0 10 20 30 40
TABAS, IRAN, 1978, MAGNITUDE 7.4
RSN143_FN
-3.00E-01
-2.00E-01
-1.00E-01
0.00E+00
1.00E-01
2.00E-01
3.00E-01
0 10 20 30 40 50
LANDERS, CALIFORNIA, 1992, MAGNITUDE 7.28
RSN864_FN
-3.00E-01
-2.00E-01
-1.00E-01
0.00E+00
1.00E-01
2.00E-01
3.00E-01
0 10 20 30 40
KOCAELI, TURKEY, 1999, MAGNITUDE 7.51
RSN1165_FN
GENERAL APPROACH IN PBD
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-3.00E-01
-2.00E-01
-1.00E-01
0.00E+00
1.00E-01
2.00E-01
3.00E-01
0 50 100 150
MAULE, CHILE, 2010, MAGNITUDE 8.8
STL_HNE
-3.00E-01
-2.00E-01
-1.00E-01
0.00E+00
1.00E-01
2.00E-01
3.00E-01
0 10 20 30 40 50
HECTOR MINE, CALIFORNIA, 1999, MAGNITUDE 7.13
RSN1787_000
Seven Ground Motions used in NLTHA
-3.00E-01
-2.00E-01
-1.00E-01
0.00E+00
1.00E-01
2.00E-01
3.00E-01
0 10 20 30 40 50 60 70
MICHOACAN, MEXICO, 1985, MAGNITUDE 8.1
UNIO_N
GENERAL APPROACH IN PBD
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Projects in the Philippines
Buildings Designed Using PBD Approach
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NOVA MANILA
Perspective Typical Floor Plan Elevations
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Mode 1, 4.37s Mode 2, 4.01s Mode 3, 2.68s
NOVA MANILA
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NOVA MANILA
Story Drift Plots
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NOVA MANILA
Shearwall Strain Plots
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THE SUITES
Perspective Typical Floor Plan Elevations
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Mode 1, 7.68s Mode 2, 5.65s Mode 3, 4.91s
THE SUITES
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Story Drift Plots
THE SUITES
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Shearwall Strain Plots
THE SUITES
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THE SPIRE
Perspective
Typical Floor Plan
Elevations
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Mode 1, 6.917s Mode 2, 5.92s Mode 3, 4.88s
THE SPIRE
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Story Drift Plots Shearwall Strain Plots
THE SPIRE
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PROSCENIUM
Perspective
Elevations
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Mode 1, 6.26s Mode 2, 5.97s Mode 3, 5.50s
PROSCENIUM
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Story Drift Plots
PROSCENIUM
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Shearwall Strain Plots
PROSCENIUM
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PARK TERRACES
Perspective Typical Floor Plan Elevations
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Mode 1, 5.75s Mode 2, 4.86s Mode 4, 1.38s
PARK TERRACES
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Story Drift Plots
PARK TERRACES
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Shearwall Strain Plots
PARK TERRACES
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EMERALD
Perspective
Typical Floor Plan
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EMERALD
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EMERALD
BRB
BRB
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EMERALD
BRB
BRB
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EMERALD
BRB BRB BRB BRB
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REMARKS
Code based design approach implies that the building will not
collapse during very strong earthquake. Performance based
design approach guarantees it.
Codes do not have explicit provisions for ALL buildings
PBD results in a better performing building during a very strong
earthquake.
PBD IS THE FUTURE OF EARTHQUAKE ENGINEERING
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“THERE’S A WAY TO DO IT BETTER – FIND IT”.
- T H O M A S E D I S O N
THANK YOU!