000018389 001__ 18389
000018389 005__ 20170118182220.0
000018389 04107 $$aeng
000018389 046__ $$k2017-01-09
000018389 100__ $$aZhang, Lei
000018389 24500 $$aExperimental Investigation on Dynamic Behaviour of  Free-Standing Frames With Friction

000018389 24630 $$n16.$$pProceedings of the 16th World Conference on Earthquake Engineering
000018389 260__ $$b
000018389 506__ $$arestricted
000018389 520__ $$2eng$$aMany existing structures in seismic vulnerable areas require seismic upgrading to prevent the collapse in case of extreme earthquakes. This paper proposes an approach based on the separation of the columns base from the foundation, which allows the superstructure to slide in case of large magnitude ground motions. Such a system can cap the base shear transmitted to the superstructure by means of the friction force between the sliding surface and the column base. To achieve a proper value of friction coefficient graphite lubrication is applied on the sliding surface. In order to verify the efficiency of the proposed system, a series of shake table test was conducted. The specimen was designed to simulate the features of realistic structures and to take into account the possible influence of overturning moment and superstructure flexibility. Based on the experimental evidence, the lubricated system showed an efficient behaviour. The graphite lubrication reduced the friction coefficient to 0.16 and provided a stable behaviour, despite a large number of loading cycles. When increasing the magnitude of ground motion, the maximum base shear coefficient of the superstructure tended towards an upper limit close to 0.35. The overturning moment showed a negligible influence on the overall response.

000018389 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000018389 653__ $$afree-standing; seismic retrofitting; steel-mortar; carbon graphite, friction.

000018389 7112_ $$a16th World Conference on Earthquake Engineering$$cSantiago (CL)$$d2017-01-09 / 2017-01-13$$gWCEE16
000018389 720__ $$aZhang, Lei$$iKurata, Masahiro$$iNakashima, Masayoshi$$iHu, Hongsong$$iHamashima, Ikumi$$iBarbagallo, Francesca
000018389 8560_ $$ffischerc@itam.cas.cz
000018389 8564_ $$s463556$$uhttps://invenio.itam.cas.cz/record/18389/files/1358.pdf$$yOriginal version of the author's contribution as presented on USB, paper 1358.
000018389 962__ $$r16048
000018389 980__ $$aPAPER