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The Concrete Conventionand Exposition
The Concrete Conventionand Exposition
PERFORMANCE-BASED
SEISMIC DESIGN
JOE FERZLI, PE, SE
The Concrete Conventionand Exposition
The Concrete Conventionand Exposition
CKC AT A GLANCEPERFORMANCE-BASED SEISMIC DESIGN
The Concrete Conventionand Exposition
The Concrete Conventionand Exposition
CODE
LAYOUT
PBSD
LAYOUT
CODE VS PBSD
The Concrete Conventionand Exposition
The Concrete Conventionand Exposition
GOVERNING STANDARDS
The Concrete Conventionand Exposition
The Concrete Conventionand Exposition
Concrete shear wall with
openings(Coupled Wall)
Plastic hinge locations at
coupling beams and base of wall
Concrete core wall without openings (Cantilever wall)
Flexural plastic hinge location,
detailed for ductility
SHEAR WALL BEHAVIOR
The Concrete Conventionand Exposition
The Concrete Conventionand Exposition
COUPLED WALLS
The Concrete Conventionand Exposition
The Concrete Conventionand Exposition
The Concrete Conventionand Exposition
The Concrete Conventionand Exposition
CORE WALL CONFIGURATIONS
The Concrete Conventionand Exposition
The Concrete Conventionand Exposition
BUILDING SEISMIC PERFORMANCE
Building Performance Levels
Immediate Occupancy
Life Safety
Collapse Prevention
Design Earthquake (2/3 MCER)
(~700 years)
Risk Adjusted Maximum
Considered Earthquake, MCER
(~2,000 years)
Gro
un
d M
oti
on
Le
ve
ls Service Level Earthquake
(43 years)
The Concrete Conventionand Exposition
The Concrete Conventionand Exposition
The Concrete Conventionand Exposition
The Concrete Conventionand Exposition
0
5
10
15
20
25
30
35
40
45
50
0 2,000 4,000 6,000 8,000 10,000 12,000 14,000
Leve
l
Shear (k)
Core Shear Comparison
Shear, X-Dir (M+S)
Shear, Y-Dir (M+S)
The Concrete Conventionand Exposition
The Concrete Conventionand Exposition
0
5
10
15
20
25
30
35
40
45
50
0 2,000 4,000 6,000 8,000 10,000 12,000 14,000
Leve
l
Shear (k)
Shear Comparison - Y dir
RY
PERFORM (M+S)
The Concrete Conventionand Exposition
The Concrete Conventionand Exposition
CORE GEOMETRY STUDY
The Concrete Conventionand Exposition
The Concrete Conventionand Exposition
CORE SHEAR COMPARISON
The Concrete Conventionand Exposition
The Concrete Conventionand Exposition
DYNAMIC AMPLIFICATIONS
The Concrete Conventionand Exposition
The Concrete Conventionand Exposition
DYNAMIC AMPLIFICATIONS
The Concrete Conventionand Exposition
The Concrete Conventionand Exposition
-5
0
5
10
15
20
25
30
35
-8,000 -3,000 2,000 7,000 12,000
Leve
l
Shear Force
Core Shear Force
MCE Nonlinear Model (Mean)
DBE Linear Model
SLE Linear Model
Wind Tunnel
The Concrete Conventionand Exposition
The Concrete Conventionand Exposition
-5
0
5
10
15
20
25
30
35
-15,000 185,000 385,000 585,000 785,000 985,000 1,185,000 1,385,000 1,585,000
Leve
l
Moment
Core Moment
MCE Nonlinear Model (Mean)
DBE Linear Model
SLE Linear Model
Wind Tunnel
The Concrete Conventionand Exposition
The Concrete Conventionand Exposition
DIAGONALLY REINFORCED COUPLING BEAMS
The Concrete Conventionand Exposition
The Concrete Conventionand Exposition
Diagonally Reinforced
Concrete Coupling
Beam
Steel Fiber
Reinforced
Concrete (SFRC)
Coupling Beam
DIAGONALLY REINFORCED VS. SFRC COUPLING BEAMS
The Concrete Conventionand Exposition
The Concrete Conventionand Exposition
BEKAERT DRAMIX© STEEL FIBERS
DIAMETER: 0.015"
LENGTH: 1.18"
STRENGTH: 445 KSI
MATERIAL: ASTM A820
DOSAGE: 1.5% BY VOLUME
= 200 #/YD³
The Concrete Conventionand Exposition
The Concrete Conventionand Exposition
COUPLED WALL TEST
Conventional RC Coupling
Beam
SFRC Coupling Beam
The Concrete Conventionand Exposition
The Concrete Conventionand Exposition
SFRC COUPLING BEAM TESTING
TESTED WITH
ASPECT RATIOS
[1.75 2.75 3.3]3% Drift 5% Drift
The Concrete Conventionand Exposition
The Concrete Conventionand Exposition
SFRC COUPLING BEAMS
The Concrete Conventionand Exposition
The Concrete Conventionand Exposition
LINCOLN
SQUARE EXP
BELLEVUE
The Concrete Conventionand Exposition
The Concrete Conventionand Exposition
3D PERFORM MODEL
The Concrete Conventionand Exposition
The Concrete Conventionand Exposition
ANALYTICAL MODEL CALIBRATIONM
om
ent
Rotation
The Concrete Conventionand Exposition
The Concrete Conventionand Exposition
DESIGN PROCEDURE OF SFRC BEAM
• Full coupling beam section is active for resisting shear (reinforcement steel and concrete)
• Shear steel reinforcement shall be greater then 40% of design VPR
• The remainder of shear attributed to SFRC ≤ 3 √ f ’c
VFRC – VPR –VS < 3 √ f ’cVPR = 2*MPR + VGRAVITY
Full Confinement Full Confinement
VS > 40% VPR
L
Shear Friction Check
at Face of Wall
Two Critical Sections
for Moment
The Concrete Conventionand Exposition
The Concrete Conventionand Exposition
Mo
men
t
Rotation
The Concrete Conventionand Exposition
The Concrete Conventionand Exposition
SFRC COUPLING BEAMS APPLICATION
The Concrete Conventionand Exposition
The Concrete Conventionand Exposition
PERFORMANCE-BASED
SEISMIC DESIGN
JOE FERZLI, PE, SE