000013393 001__ 13393
000013393 005__ 20161114160339.0
000013393 04107 $$aeng
000013393 046__ $$k2009-06-22
000013393 100__ $$aSpyrakos C., C.
000013393 24500 $$aNear-source directivity effects on medium-long period structures

000013393 24630 $$n2.$$pComputational Methods in Structural Dynamics and Earhquake Engineering
000013393 260__ $$bNational Technical University of Athens, 2009
000013393 506__ $$arestricted
000013393 520__ $$2eng$$aThis study presents a new definition of the strong motion duration, combining the alternative bracketed and significant duration definitions. Based on the time integral of the absolute ground velocity, a new index is defined, as the cumulative absolute displacement CAD. The index is used in order to evaluate the strong motion duration. The proposed bracketed-significant duration is well correlated with the strong motion part of the records, especially in the case of near-source events. The duration and the CAD index are correlated with the structural behaviour of medium-to-long period structures. Two normalized parameters representing the amplification of structural response and the number of equivalent loading cycles are determined in terms of the proposed duration and CAD indices. The proposed parameters appear to be better correlated with the structural response than other well-known indices. As a case study the dynamic response of a reinforced concrete frame-wall structure subjected to nearfault excitations with forward directivity characteristics is study. The design of the structure resulted as a part of a US-Japan cooperative research program and was based on UBC provisions. Both analytical studies and experimental work results are available for the prototype; thus, allowing comprehensive modeling and study of the nonlinear dynamic behavior. The frame was considered as an excellent design example according to the strong column – weak beam philosophy and was able to undertake the ductility demands of a pulse-type excitation with pulse-period similar to the period of the structure.

000013393 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000013393 653__ $$a

000013393 7112_ $$aCOMPDYN 2009 - 2nd International Thematic Conference$$cIsland of Rhodes (GR)$$d2009-06-22 / 2009-06-24$$gCOMPDYN2009
000013393 720__ $$aSpyrakos C., C.$$iManiatakis C., A.$$iTaflabas I., M.
000013393 8560_ $$ffischerc@itam.cas.cz
000013393 8564_ $$s11806$$uhttps://invenio.itam.cas.cz/record/13393/files/CD701.pdf$$yOriginal version of the author's contribution as presented on CD, section: Wave propagation and near source effects - i.
000013393 962__ $$r13074
000013393 980__ $$aPAPER