000019709 001__ 19709
000019709 005__ 20170118182333.0
000019709 04107 $$aeng
000019709 046__ $$k2017-01-09
000019709 100__ $$aMazza, Fabio
000019709 24500 $$aEffects of Fire-Damage on the Nonlinear Response of R.C. Base-Isolated Buildings Under Near-Fault Earthquakes

000019709 24630 $$n16.$$pProceedings of the 16th World Conference on Earthquake Engineering
000019709 260__ $$b
000019709 506__ $$arestricted
000019709 520__ $$2eng$$aThe increase in the deformability of a fire-damaged base-isolated building may lead to an amplification in the structural response under the long-duration horizontal pulses of near-fault earthquakes. Moreover, high values of the peak acceleration ratio, defined as the ratio between the peak value of the vertical acceleration and the analogous value of the horizontal acceleration, can become critical once the strength level of a fire-weakened base-isolated structure is reduced. To study the nonlinear seismic response following fire, a numerical investigation is carried out on six-storey r.c. base-isolated structures, composed of a basement and five storeys above the ground level, designed in line with the Italian seismic code. The baseisolation system is constituted of High-Damping-Laminated-Rubber Bearings (HDLRBs). Different values of fire resistance and opening factor representing the amount of ventilation are considered, in line with the parametric temperature-time fire curve proposed by Eurocode 1. Three fire scenarios are examined, with the fire compartment confined to the area of the base-isolated level (i.e. F0) and first (i.e. F1) and fifth (i.e. F5) levels of the superstructure. A numerical investigation is carried out by means of thermal-mechanical mapping analysis, with reduced mechanical properties of both r.c. crosssections, in line with the 500°C isotherm method proposed by Eurocode 2, and HDLRBs, in line with a proposed 200°C isotherm method. A nonlinear incremental dynamic analysis considers the horizontal and vertical components of near-fault earthquakes. Plastic conditions are assessed at the potential critical sections of the beams (i.e. end sections of the subelements in which a beam is discretized) and columns (i.e. end sections). The response of a HDLRB is simulated with a viscoelastic model with variable stiffness properties in the horizontal and vertical directions, depending on the axial force and lateral deformation.

000019709 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000019709 653__ $$aBase-isolated framed structures; Fire damaged r.c. members; Fire damaged HDLRBs; Near-fault earthquakes.

000019709 7112_ $$a16th World Conference on Earthquake Engineering$$cSantiago (CL)$$d2017-01-09 / 2017-01-13$$gWCEE16
000019709 720__ $$aMazza, Fabio$$iAlesina, Fabio
000019709 8560_ $$ffischerc@itam.cas.cz
000019709 8564_ $$s1230502$$uhttps://invenio.itam.cas.cz/record/19709/files/422.pdf$$yOriginal version of the author's contribution as presented on USB, paper 422.
000019709 962__ $$r16048
000019709 980__ $$aPAPER