SHRP-A-379 traducir

the axial actuator is under closed loop feedback control from the LVDT measuring the
relative displacement between the specimen caps). Precondition the specimen by applying a
haversine load corresponding to a 7 kPa shear stress for 100 cycles (0.1 s on, 0.6 s off).
After preconditioning the specimen, apply a 70 kPa haversine shear pulse (0.1 s on and 0.6 s
off) for 5000 cycles or until 5 % shear strain is reached. Axial and shear deformations, as
well as axial and shear loads, should be recorded at appropriate intervals. Collecting 60 data
points per load cycle is sufficient.
The following test parameters
should be recorded.
• axial load (P)
• shear load (1/)
• dtv= vertical displacement of the specimen
• c5h = horizontal displacement of the specimen
The following engineering quantities should be calculated.
• all= P/A; axial stress where A is the cross-sectional area of the specimen
• r12 = V/A; shear stress
• e12 = /iJh; shear strain where h is the height of the specimen
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