000013598 001__ 13598
000013598 005__ 20161114165847.0
000013598 04107 $$aeng
000013598 046__ $$k2011-05-25
000013598 100__ $$aSophocleous, A.
000013598 24500 $$aBracing Configuration in Earthquake Resistant Structure

000013598 24630 $$n3.$$pComputational Methods in Structural Dynamics and Earhquake Engineering
000013598 260__ $$bNational Technical University of Athens, 2011
000013598 506__ $$arestricted
000013598 520__ $$2eng$$aTechnological advances in the seismic design of energy dissipation systems raise the issue of the codes dominated capacity design of structures. Building code requirements that describe the dynamic behavior, modeling and analysis of structures with different types of energy dissipation systems are currently under review. A new seismic design approach, described in the current paper, adds to the current research activities of the authors on passively controlled systems with integrated hysteretic damper and cable bracings. The control system considers at first place the effect of added stiffness when conventional bracings are added to structural frames that are necessary for the integration of the damping devices. An increase in the systems stiffness may result to a reduction of the peak displacement, i.e. peak pseudo-acceleration, and thus to an increase of the shear forces. In addition, an increase in damping can significantly influence the response of elastic and inelastic systems. The new system proposed aims at both, energy dissipation and damage control. It consists of an energy dissipation device and a portal cable bracing mechanism with a kinetic closed loop, working only in tension. The closed bracing mechanism does not practically affect the initial stiffness of the system, i.e. the concept relies on two completely “separate” systems: a primary for the vertical- and wind loads and a secondary for the earthquake loads. Analysis model considerations for describing the physical behavior of the system in computational language are presented, by incorporating the SAP2000 program, revealing step by step the procedure followed for the resulting desired dynamic performance. Based on the energy balanced equation at each time-step, the hysteretic energy dissipation demand is reduced when the supplemental damping system is utilized. An Effective Toughness Index, in accordance to the timedependence of the hysteretic energy dissipation is proposed to characterize the portions of the input energy dissipated by the control system. The predominant parameters that characterize the system’s seismic behavior are derived on the basis of a parametric analysis under selected international strong ground motions. Finally the systems behavior is verified in respect to the mechanical properties of the control elements under the action of ten selected earthquake excitations of the Greek-Mediterranean region. The parametric analyses of the system’s seismic behavior conclude with a proposed preliminary design methodology for the passively controlled SDOF models.

000013598 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000013598 653__ $$aDual Structures, Hysteretic Dampers, Cable Bracing, Energy Dissipation Systems.

000013598 7112_ $$aCOMPDYN 2011 - 3rd International Thematic Conference$$cIsland of Corfu (GR)$$d2011-05-25 / 2011-05-28$$gCOMPDYN2011
000013598 720__ $$aSophocleous, A.$$iPhocas, M.
000013598 8560_ $$ffischerc@itam.cas.cz
000013598 8564_ $$s2070790$$uhttps://invenio.itam.cas.cz/record/13598/files/351.pdf$$yOriginal version of the author's contribution as presented on CD, section: RS 15 Design Methods Under Dynamic and Seismic Action .
000013598 962__ $$r13401
000013598 980__ $$aPAPER