000018344 001__ 18344
000018344 005__ 20170118182218.0
000018344 04107 $$aeng
000018344 046__ $$k2017-01-09
000018344 100__ $$aSuzuki, Kento
000018344 24500 $$aDynamic Characteristics of Buildings Constructed By Pile Top Seismic Isolation System Considering Nonlinearity of Laminated Rubber Bearing

000018344 24630 $$n16.$$pProceedings of the 16th World Conference on Earthquake Engineering
000018344 260__ $$b
000018344 506__ $$arestricted
000018344 520__ $$2eng$$aA pile top seismic isolation system is used for constructing base-isolated buildings. In this system, seismic isolators are set on the pile’s top directly, and piles are connected with thin foundation girders or a mat slab. In recent years, many logistics centers in Japan have been constructed using this system because it enables significant cost reductions in underground construction. However, this system does have some problems. For example, the laminated rubber bearing’s bottom part easily undergoes bending rotation because the thin foundation girders have low stiffness. This tendency becomes more pronounced in the case of soft ground. If bending rotation occurs, the laminated rubber bearing’s horizontal stiffness reduces under the influence of the horizontal component of the axial load, and its inflection point moves downward from the center height of the device (usually, the point does not move). This, in turn, significantly affects the structural characteristics of the pile top seismic isolation building. In addition, it has been noted that the horizontal stiffness and rotational stiffness of the laminated rubber bearing show deformation-dependent nonlinearity. In order to evaluate such special behaviors of the pile top seismic isolation building appropriately, it is required to consider the dynamic soil–structure interaction and the nonlinearity of the laminated rubber bearing. In particular, analytical models that can consider the geometric nonlinearity and various nonlinear characteristics caused by the bending rotation of a laminated rubber bearing have been proposed. However, highly specialized knowledge is needed to use these models, and such knowledge is difficult to incorporate into general-purpose design software. Therefore, it’s not considered sufficiently their effects in conventional structural design at present. This paper describes the seismic behaviors of laminated rubber bearings in a pile top seismic isolation buildings through numerical experiments by considering the nonlinearity of the laminated rubber bearing and the dynamic soil– structure interaction. The parametric analytical study is performed by the elasto-plastic earthquake response analysis. The analytical model is of the fishbone type, and it represents one span of the logistics center. It consists of a superstructure, seismic isolated layer, thin foundation girders, a pile, soil-pile springs, and free field. The laminated rubber bearing model is based on Haringx’s theory, and this model is constructed using three matrices: horizontal stiffness matrix, geometric nonlinear matrix, and rotational stiffness matrix. The following conclusions are obtained through numerical experiments on the pile top seismic isolation building.

000018344 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000018344 653__ $$aPile Top Seismic Isolation System, Laminated Rubber Bearing, Nonlinearity, Dynamic Characteristic

000018344 7112_ $$a16th World Conference on Earthquake Engineering$$cSantiago (CL)$$d2017-01-09 / 2017-01-13$$gWCEE16
000018344 720__ $$aSuzuki, Kento$$iSato, Toshiaki$$iNagano, Masayuki$$iKitamura, Haruyuki$$iYamauchi, Toyohide
000018344 8560_ $$ffischerc@itam.cas.cz
000018344 8564_ $$s1272974$$uhttps://invenio.itam.cas.cz/record/18344/files/1275.pdf$$yOriginal version of the author's contribution as presented on USB, paper 1275.
000018344 962__ $$r16048
000018344 980__ $$aPAPER