DOMAGOJ DAMJANOVIĆ - unizg.hr...Test protocol The cyclic horizontal load protocol is composed...
Transcript of DOMAGOJ DAMJANOVIĆ - unizg.hr...Test protocol The cyclic horizontal load protocol is composed...
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associate profesor DOMAGOJ DAMJANOVIĆ Construction Testing Laboratory
Faculty of Civil Engineering
University of Zagreb
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Test set-up
Setup A Setup B
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Test protocol The cyclic horizontal load protocol is composed of three sets of rules:
Definition of a yielding point (the Yasumura and Kawai (1997) procedure for timber shear wall)
Cyclic protocol EN 12512:2001 in the range of low displacement amplitudes (up to 2dy)
Cyclic protocol ATC-24 in the range of high displacement amplitudes (over 2dy)
Displacement (mm)
Hori
zo
nta
l fo
rce
(kN
)
EN 12512 ([%]*dy) ATC-24 ([%]*h or +0.5 dy)
v=0.25 mm/s
v=0.5 mm/s v = 1 mm/s
Time (s)
Sto
ry d
rift [
h/d
] (%
)
dy
2 d
y
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Test protocol
Displacement (mm)
Hori
zo
nta
l fo
rce
(kN
)
EN 12512 ([%]*dy) ATC-24 ([%]*h or +0.5 dy)
v=0.25 mm/s
v=0.5 mm/s v = 1 mm/s
Time (s)
Sto
ry d
rift [
h/d
] (%
)
dy
2 d
y
Specimens of each type of joints were loaded by monotonous lateral loads until reaching a 20% drop of load bearing capacity to obtain the load-deformation curve which was used to determine the displacement at a yielding point (dy)
The range of low amplitudes is divided into parts concerning the actuator velocity of 0,25 mm/s up to displacement amplitude equal to dy and velocity of 0,50 mm/s up to a displacement amplitude of 2dy.
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Test protocol
Displacement (mm)
Hori
zo
nta
l fo
rce
(kN
)
EN 12512 ([%]*dy) ATC-24 ([%]*h or +0.5 dy)
v=0.25 mm/s
v=0.5 mm/s v = 1 mm/s
Time (s)
Sto
ry d
rift [
h/d
] (%
)
dy
2 d
y
After reaching the limit of 2dy the speed of actuator increased to 1,00 mm/s
Three cycles of loading were performed for each selected amplitude
Testing ended when the complete failure of joints was achieved
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Test results for Φ10 mm threaded glued–in steel bar and Setup A
for Φ10 mm threaded glued–in steel bar and Setup B
failure due to timber compressive crushing and reaching tensile strength of steel bar
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Test results for Φ14 mm threaded glued–in steel bar and Setup A
for Φ14 mm threaded glued–in steel bar and Setup B
failure due to timber compressive crushing
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Test demonstration for Φ20 mm threaded glued–in steel bar and Setup A