000020280 001__ 20280
000020280 005__ 20170118182407.0
000020280 04107 $$aeng
000020280 046__ $$k2017-01-09
000020280 100__ $$aMorita, Keiko
000020280 24500 $$aBasic Characteristics and Fatigue Properties of Lead Damper for Seismic Isolation System

000020280 24630 $$n16.$$pProceedings of the 16th World Conference on Earthquake Engineering
000020280 260__ $$b
000020280 506__ $$arestricted
000020280 520__ $$2eng$$aIn order to protect people, buildings and other important facilities from damage caused by earthquakes, seismic isolation systems have been developed. In Japan, many buildings are protected using seismic isolation with supplemental damping, including U-shaped lead dampers. Lead is used as the energy dissipation component of these dampers, because pure lead has the characteristics of low yield stress and very high ductility with minimal strain hardening. The hysteretic behavior of this damper is elasto-plastic, and this allows it to provide high levels of damping performance. However, the formation of fatigue cracks on the surface of the lead caused by small oscillations due to wind or traffic vibration, affects the damping properties of the damper. Although it is known that the fatigue properties of lead can be improved by a vaseline-coating or a greasecoating on the specimen surface, the effect of the coating is not well understood qualitatively and quantitatively. To clarify this effect, we carried out two types of tests: (1) very small deformation cyclic tests under similar actual conditions using a full-size, U-shaped lead damper, and (2) rotating-bending fatigue tests on pure lead round bars. Based on the results of these tests, a grease-coating is identified as an effective method of fatigue life enhancement.

000020280 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000020280 653__ $$aSeismic Isolation, Lead, Damper, Fatigue Test

000020280 7112_ $$a16th World Conference on Earthquake Engineering$$cSantiago (CL)$$d2017-01-09 / 2017-01-13$$gWCEE16
000020280 720__ $$aMorita, Keiko$$iYasunaga, Akira$$iTakayama, Mineo
000020280 8560_ $$ffischerc@itam.cas.cz
000020280 8564_ $$s1025588$$uhttps://invenio.itam.cas.cz/record/20280/files/90.pdf$$yOriginal version of the author's contribution as presented on USB, paper 90.
000020280 962__ $$r16048
000020280 980__ $$aPAPER