000018539 001__ 18539
000018539 005__ 20170118182227.0
000018539 04107 $$aeng
000018539 046__ $$k2017-01-09
000018539 100__ $$aSierra, Armando
000018539 24500 $$aFast Nonlinear Response History Analysis

000018539 24630 $$n16.$$pProceedings of the 16th World Conference on Earthquake Engineering
000018539 260__ $$b
000018539 506__ $$arestricted
000018539 520__ $$2eng$$aNonlinear response history analysis (RHA) has been a powerful tool in performance-based seismic engineering for validating proposed design of new or performance assessment of existing structures. In this approach, the seismic demands are determined by nonlinear RHAs of the structure excited by several ground motion acceleration records. When it is applied to structural systems with a large number of degrees of freedom such as three-dimensional models of tall buildings, bridges, or dams, the analyses can be computationally challenging and time consuming. The prolonged computing times become even more prominent in parametric studies or in incremental dynamic analyses where a computer model of the structure is subjected to a series of nonlinear RHAs by systematically increasing the intensity of input excitation. In order to reduce the computation time, this study proposes a practical method whereby leading and trailing weak signals in the acceleration record are trimmed, and remaining record is downsampled. The proposed method preserves significant frequency characteristics of the original record including its S-phase. The parameter to identify leading and trailing portions of the record to be trimmed is the maximum roof displacement calculated by implementing the uncoupled modal response history analysis. This parameter is selected because it represents the characteristics of both the ground motion and structural response with the goal of obtaining a highly efficient RHA without significant error. Test results based on three-dimensional computer models of idealized 5, 10, 15 and 20-story reinforced concrete structures demonstrate that the proposed method is not only viable, but also capable of controlling discrepancies in estimates of engineering demand parameters (EDPs) such as peak roof displacement. Performance of the proposed method is evaluated in terms of a goodness of fit test, comparing peak roof displacements obtained from the trimmed and downsampled records under uni-directional excitations with those from the original records.

000018539 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000018539 653__ $$aNonlinear response history analysis; Finite element modeling; Computation time; Accelerograms; Downsampling.

000018539 7112_ $$a16th World Conference on Earthquake Engineering$$cSantiago (CL)$$d2017-01-09 / 2017-01-13$$gWCEE16
000018539 720__ $$aSierra, Armando$$iKalkan, Erol$$iReyes, Juan
000018539 8560_ $$ffischerc@itam.cas.cz
000018539 8564_ $$s5208639$$uhttps://invenio.itam.cas.cz/record/18539/files/1673.pdf$$yOriginal version of the author's contribution as presented on USB, paper 1673.
000018539 962__ $$r16048
000018539 980__ $$aPAPER