J. Phys. Colloques
Volume 46, Numéro C10, Décembre 1985Eighth International Conference on Internal Friction and Ultrasonic Attenuation in Solids
|Page(s)||C10-421 - C10-424|
J. Phys. Colloques 46 (1985) C10-421-C10-424
HYSTERETIC DAMPERS FOR PROTECTING STRUCTURES DURING EARTHQUAKESW.H. ROBINSON
Physics and Engineering Laboratory, Department of Scientific & Industrial Research, Lower Hutt, New Zealand
The cyclic plastic deformation of steel and lead can be used to absorb the energy of motion of a base isolated structure during an earthquake. Hysteretic dampers made of steel and lead have been developed at our laboratory and tested over a wide range of conditions. In particular the lead extrusion damper and the lead-rubber bearing have been tested with satisfactory results at frequency of ~10-6 to ~50 Hz and at engineering strains as high as 200%. The force-displacement hysteresis loop due to the lead is found to be rectangular and at ambient temperatures the lead is able to be "hot worked" over many cycles. At high cyclic strains, unrestrained lead cylinders are found to be unstable due to the application of "simple" shear rather than "pure" shear.