000013273 001__ 13273
000013273 005__ 20161114160334.0
000013273 04107 $$aeng
000013273 046__ $$k2009-06-22
000013273 100__ $$aMoustafa, A.
000013273 24500 $$aDamage-based design earthquake loads for sdof inelastic structures

000013273 24630 $$n2.$$pComputational Methods in Structural Dynamics and Earhquake Engineering
000013273 260__ $$bNational Technical University of Athens, 2009
000013273 506__ $$arestricted
000013273 520__ $$2eng$$aThis paper develops a new framework for modeling design earthquake loads for inelastic structures. The design ground acceleration is expressed as a Fourier series, with unknown amplitude and phase angle, modulated by an envelope function. The design earthquake is estimated by solving an inverse dynamic problem, using nonlinear programming techniques, such that the structural damage is maximized. At the same time, the ground motion is constrained to the available information on past recorded ground motions. The structural damage is quantified in terms of Park and Ang’s damage indices. The damage indices imply that the structure is damaged by a combination of repeated stress reversals and high stress excursions. Additionally, the damage indices provide a measure of the structural damage level and thus a decision on necessary repair is possible. The material stress-strain relationship is modeled using a bilinear law. The formulation is demonstrated by deriving the optimal earthquake loads for inelastic framed structures at a firm soil site.

000013273 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000013273 653__ $$aEarthquake Loads, Inelastic Structures, Ductility Ratio, Hysteretic Energy, Damage Indices, Nonlinear Optimization. Abstract. This paper develops a new framework for modeling design earthquake loads for inelastic structures. The design ground acceleration is expressed as a Fourier series, with unknown amplitude and phase angle, modulated by an envelope function. The design earthquake is estimated by solving an inverse dynamic problem, using nonlinear programming techniques, such that the structural damage is maximized. At the same time, the ground motion is constrained to the available information on past recorded ground motions. The structural damage is quantified in terms of Park and Ang’s damage indices. The damage indices imply that the structure is damaged by a combination of repeated stress reversals and high stress excursions. Additionally, the damage indices provide a measure of the structural damage level and thus a decision on necessary repair is possible. The material stress-strain relationship is modeled using a bilinear law. The formulation is demonstrated by deriving the optimal earthquake loads for inelastic framed structures at a firm soil site.

000013273 7112_ $$aCOMPDYN 2009 - 2nd International Thematic Conference$$cIsland of Rhodes (GR)$$d2009-06-22 / 2009-06-24$$gCOMPDYN2009
000013273 720__ $$aMoustafa, A.$$iTakewaki, I.
000013273 8560_ $$ffischerc@itam.cas.cz
000013273 8564_ $$s359108$$uhttps://invenio.itam.cas.cz/record/13273/files/CD409.pdf$$yOriginal version of the author's contribution as presented on CD, section: Seismic safety assessment of structures - iii (MS).
000013273 962__ $$r13074
000013273 980__ $$aPAPER