structural design of tall buildings in the philippines...
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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
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
ALTERNATIVE METHOD OF ANALYSIS
Performance-Based Design
Modern approach
Non-prescriptive
Meet performance objectives
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
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
GENERAL APPROACH IN PBD
FUGRO Site Specific
Study
GENERAL APPROACH IN PBD
RWDI Wind Tunnel Study
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
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
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
-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
Projects in the Philippines
Buildings Designed Using PBD Approach
NOVA MANILA
Perspective Typical Floor Plan Elevations
Mode 1, 4.37s Mode 2, 4.01s Mode 3, 2.68s
NOVA MANILA
NOVA MANILA
Story Drift Plots
NOVA MANILA
Shearwall Strain Plots
THE SUITES
Perspective Typical Floor Plan Elevations
Mode 1, 7.68s Mode 2, 5.65s Mode 3, 4.91s
THE SUITES
Story Drift Plots
THE SUITES
Shearwall Strain Plots
THE SUITES
THE SPIRE
Perspective
Typical Floor Plan
Elevations
Mode 1, 6.917s Mode 2, 5.92s Mode 3, 4.88s
THE SPIRE
Story Drift Plots Shearwall Strain Plots
THE SPIRE
PROSCENIUM
Perspective
Elevations
Mode 1, 6.26s Mode 2, 5.97s Mode 3, 5.50s
PROSCENIUM
Story Drift Plots
PROSCENIUM
Shearwall Strain Plots
PROSCENIUM
PARK TERRACES
Perspective Typical Floor Plan Elevations
Mode 1, 5.75s Mode 2, 4.86s Mode 4, 1.38s
PARK TERRACES
Story Drift Plots
PARK TERRACES
Shearwall Strain Plots
PARK TERRACES
EMERALD
Perspective
Typical Floor Plan
EMERALD
EMERALD
BRB
BRB
EMERALD
BRB
BRB
EMERALD
BRB BRB BRB BRB
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
“THERE’S A WAY TO DO IT BETTER – FIND IT”.
- T H O M A S E D I S O N
THANK YOU!
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