000018999 001__ 18999
000018999 005__ 20170118182254.0
000018999 04107 $$aeng
000018999 046__ $$k2017-01-09
000018999 100__ $$aShao, Benshun
000018999 24500 $$aUnderstanding and Design of Seismically Isolated Struture Using Hardening of Bearing

000018999 24630 $$n16.$$pProceedings of the 16th World Conference on Earthquake Engineering
000018999 260__ $$b
000018999 506__ $$arestricted
000018999 520__ $$2eng$$aFor cities located in regions susceptible to strong earthquake shakings, seismic design of buildings and other facility is always a critical concern for structural engineers as well as general public. Nowadays, with the development of seismic design concepts and tools, structural safety is not the only design objective. The new concept of seismically resilient design, which aims at a higher seismic performance objective such as continually functional and shorter business downtime, is more and more accepted and implemented by earthquake engineering community. As an innovative seismic response control technology to achieve resilient design concept, seismic isolation has been widely studied and used. Classical idea of seismic isolation uncouples the upper structure movement from ground motion by concentrating displacement demand in isolation plane. However, when displacement demand is larger than the deformation capacity of isolator bearings, a failure of the isolated system will be expected, either due to the failure of bearings themselves or the large impact force introduced to the upper structure when the horizontal movements of isolator bearings are rigidly stopped. An unacceptable large risk of failure for the isolated system may be expected if the displacement capacity of isolation plane is not large enough. However, it is not economic or even not possible to provide large enough displacement capacity with a bearing designed to have constant low horizontal stiffness. Instead of using traditional isolator bearing with bi-linear hysteresis behavior, the study uses hardening bearing with increasing stiffness under large displacement and seeks an effective solution to provide enough deformation capacity and safety level for base isolated structure under beyond design seismic scenarios. However, hardening of bearing will introduce large force demand into the superstructure, therefore, the key problem to be solved in this study is how to find the balance point where enough hardening occurs to provide required displacement capacity without introducing too much damage into superstructure. The study takes Triple Friction Pendulum Bearing (TFPB) as an example of general hardening bearings. Seismic responses of a three story base isolated braced frame prototype structure with TFPB are evaluated numerically. Special attentions are paid to responses under beyond design seismic events when bearing starts to stiffening. Parametric studies have been conducted on key parameters characterizing the hardening of bearing. Based on comparison of numerical analysis results for different cases, recommendation on selection of these parameters are made through a proposed preliminary design approach.

000018999 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000018999 653__ $$aBase Isolation; Safety of Isolated Structure; Bearing Hardening; Parametric Study

000018999 7112_ $$a16th World Conference on Earthquake Engineering$$cSantiago (CL)$$d2017-01-09 / 2017-01-13$$gWCEE16
000018999 720__ $$aShao, Benshun$$iMahin, Stephen$$iAbrahamson, Norman
000018999 8560_ $$ffischerc@itam.cas.cz
000018999 8564_ $$s1690395$$uhttps://invenio.itam.cas.cz/record/18999/files/2663.pdf$$yOriginal version of the author's contribution as presented on USB, paper 2663.
000018999 962__ $$r16048
000018999 980__ $$aPAPER