Transcript Experimental Testing of DriftSensitive Nonstructural Systems – Year 4 The Pathways Project San Jose State University Equip Site: nees@berkeley.

Experimental Testing of DriftSensitive Nonstructural Systems –
Year 4
The Pathways Project
San Jose State University
Equip Site: nees@berkeley
Project Management Team

Kurt McMullin – Structural Engineering


Bozidar Stojadinovic – Structural Engineering


San Jose State University
Thuy Le – Electrical Engineering


U.C. Berkeley
Winncy Du – Mechanical Engineering


San Jose State University
San Jose State University
Kathi Rai – Building Engineering

SensiBuild
Drift Sensitive Systems of Buildings

Exterior façade.



Vertical plumbing riser.



Precast concrete cladding.
Glass punch-out windows.
Inflow riser.
Outflow riser.
Defined in FEMA-356 as nonstructural
elements controlled by drift rather than
acceleration.
Project Overview




Static testing of one-story prototype of
cladding, punch-out windows and
plumbing.
Sensor testing of plumbing leakage.
Deconstruction of materials.
Data-mining and pre-processing for
structural analysis.
Timeline
Project runs from Oct 2006 to Sept
2011.
 Main testing scheduled for
Fall/Winter 2010.
 Current phase:




Construction of specimen
Finalize instrumentation design
Fabrication of testing jig
Column Covers

Spanning vertically
between spandrels
are the column
covers.
TYPICAL COLUMN COVER PANEL - IN-PLANE
Column Covers
HALF-WIDTH COLUMN COVER
COLUMN COVER RETURN
Punch Out Windows

PUNCH OUT WINDOWS
Completing the
exterior enclosure
are the windows,
installed in the
opening between
panels.
Test Specimen


One-story, One-bay articulated frame allows
for no resistance from gravity/lateral load
carrying system.
Specimen Design


Ground Floor – Tall panels that cover first floor of
building
Typical Floor – Short panels that cover all floors
above first floor.
Test Specimen

Specimen Features


Engineering – panels and connections – to obtain
strength and deformation data
Architecture – panels, connections, windows,
grouting – to obtain aesthetic damage data and
system interaction data.
Test Specimen

Loading Protocols


Proto1 – Cyclic loading with increasing amplitude
of drift – 10% max.
Proto2 – Displacement time history from 9-story
LA SAC frame.
Test Matrix – Ground Floor

Test 1


Test 2


Cyclic Loading – Engineering Specimen
Time History Loading – Engineering Specimen
Test 3

Cyclic Loading – Architecture Specimen
Test Matrix – Typical Floor

Test 4


Test 5


Cyclic Loading – Engineering Specimen
Time History Loading – Engineering Specimen
Test 6

Cyclic Loading – Architecture Specimen
Panel Construction


Panel formwork.
Flat panel and
return panel.
Panel Construction


Panel formwork.
Flat panel and
return panel.
Panel Pin Connection


Pin connection
at base of flat
panel.
Typical panel
reinforcement –
single layer.
Panel Pin Connection


Pin connection
at base of flat
panel.
Typical panel
reinforcement –
single layer.
Casting Concrete


Casting of flat
panels in early
September
2010.
5000 psi
concrete.
Casting Concrete


Casting of flat
panels in early
September
2010.
5000 psi
concrete.
Finished Panels


Finished panels at
fabrication yard.
Casting done by
Willis Precast in San
Juan Bautista, CA.
Finished Panels


Finished panels at
fabrication yard.
Casting done by
Willis Precast in San
Juan Bautista, CA.
Full-Width
Flat Panel
Half-Width
Flat Panel
Return
Panel
Slotted
Connections
Pin
Connections
Loading Beam
Actuator on each
side of loading
beam
Reaction Wall
Out-of-Plane
Bracing
Seismic Resistance


Seismic joint at
return panels.
Approximate
width of 2 inches.
VERTICAL SEISMIC JOINT
Expected Progression of Damage


Closing of slip
connection.
Spandrel above
moves with upper
level slab.
IR
EQ D
CLOSING OF SLIP JOINT
Expected Progression of Damage



Closing of seismic
gap.
Return panels tilt
with out-of-plane
frame.
Pounding between
adjoining column
covers.
IR
EQ D
POUNDING AT JOINT
Expected Progression of Damage


Fracture of pin
connection.
Overturning of
column cover
results in
fracture of pin at
base.
IR
EQ D
PIN CONNECTION FRACTURE
Expected Progression of Damage


Crushing of
window glass.
Tipping of
column covers
results in racking
of glass panels.
IR
EQ D
GLASS FRACTURE
Expected Progression of Damage

Failure of pushpull connections
and instability of
out-of-plane
panel.
IR
EQ D
PANEL INSTABILITY
Developing Fragility Curves



Defining types of damage: i.e., window
cracking, panel connection fracture.
Record drift when damage is first seen for
each item of each test.
Plot probability that an event was seen by
a certain level of drift.
PROPOSED FORMAT FOR FRAGILITY CURVE DATA
DAMAGE TYPE 2
1.0
PROBABILITY OF DAMAGE
DAMAGE TYPE 1
0.8
DAMAGE TYPE 3
0.6
0.4
0.2
0.0
0.00
0.02
0.04
DRIFT, radians
0.06
Limitations of Fragility Data



Limited sample size of test specimens.
Some events will not occur to each
component before maximum drift of test
is applied.
Mixture of tall panels & short panels, flat
panels & return panels, large windows &
small windows.
Plans for Year 5





Testing and data processing for main
specimens.
Deconstruction and adaptive reuse of
panels.
Verification of sensor technology.
Dissemination of findings.
Data transfer to repository.
For More Information




We are constantly looking for collaboration on
all aspects of the project.
Project Sponsored by National Science
Foundation – Grant No. 619517.
Project website at:
 http://www.engr.sjsu.edu/~pathway/
Email me at:

[email protected]