000013245 001__ 13245
000013245 005__ 20161114160333.0
000013245 04107 $$aeng
000013245 046__ $$k2009-06-22
000013245 100__ $$aZotos P., C.
000013245 24500 $$aEstimation of seismic response in planar x-braced multi-storey steel frames

000013245 24630 $$n2.$$pComputational Methods in Structural Dynamics and Earhquake Engineering
000013245 260__ $$bNational Technical University of Athens, 2009
000013245 506__ $$arestricted
000013245 520__ $$2eng$$aAn extensive parametric study on the inelastic seismic response of X-braced steel buildings is presented. More than 150 regular multi-storey tension-compression X-braced steel frames are subjected to an ensemble of 30 ordinary (i.e., without near fault effects) ground motions. The records are scaled to different intensities in order to drive the structures to different levels of inelastic deformation. The statistical analysis of the created response databank indicates that the number of stories, period of vibration, column stiffness and distribution of strength along the height of the frame influence the response of X-braced frames. Strength deterioration in post-buckling region varies with the brace slenderness ratio, thus this parameter also strongly influences the amplitude of inelastic deformation. On the other hand, EC8 adopts a unique value of behaviour factor q for every X-braced structure. Stepwise regression analysis is employed in order to derive simple expressions which take into account the aforementioned influences and offer a direct estimation of the behaviour (or strength reduction) factor, the drift and the ductility demands. The proposed expressions are used for the seismic design of steel structures according to the performance-based seismic design methodology and the hybrid force/displacement method, which combines the advantages of the force-based and displacement-based seismic design methods. A comparison of the proposed method with the procedures adopted in current seismic design codes reveals the accuracy and efficiency of the former.

000013245 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000013245 653__ $$aX-braced Steel Frames, Drift Demands, Ductility Demands, Seismic Assessment, Seismic Design. Abstract. An extensive parametric study on the inelastic seismic response of X-braced steel buildings is presented. More than 150 regular multi-storey tension-compression X-braced steel frames are subjected to an ensemble of 30 ordinary (i.e., without near fault effects) ground motions. The records are scaled to different intensities in order to drive the structures to different levels of inelastic deformation. The statistical analysis of the created response databank indicates that the number of stories, period of vibration, column stiffness and distribution of strength along the height of the frame influence the response of X-braced frames. Strength deterioration in post-buckling region varies with the brace slenderness ratio, thus this parameter also strongly influences the amplitude of inelastic deformation. On the other hand, EC8 adopts a unique value of behaviour factor q for every X-braced structure. Stepwise regression analysis is employed in order to derive simple expressions which take into account the aforementioned influences and offer a direct estimation of the behaviour (or strength reduction) factor, the drift and the ductility demands. The proposed expressions are used for the seismic design of steel structures according to the performance-based seismic design methodology and the hybrid force/displacement method, which combines the advantages of the force-based and displacement-based seismic design methods. A comparison of the proposed method with the procedures adopted in current seismic design codes reveals the accuracy and efficiency of the former.

000013245 7112_ $$aCOMPDYN 2009 - 2nd International Thematic Conference$$cIsland of Rhodes (GR)$$d2009-06-22 / 2009-06-24$$gCOMPDYN2009
000013245 720__ $$aZotos P., C.$$iBazeos, N.
000013245 8560_ $$ffischerc@itam.cas.cz
000013245 8564_ $$s292731$$uhttps://invenio.itam.cas.cz/record/13245/files/CD364.pdf$$yOriginal version of the author's contribution as presented on CD, section: Steel and composite structures - i.
000013245 962__ $$r13074
000013245 980__ $$aPAPER