000015904 001__ 15904
000015904 005__ 20161115135333.0
000015904 04107 $$aeng
000015904 046__ $$k2013-06-12
000015904 100__ $$aHosseini, M.
000015904 24500 $$aSimplification of Earthquake Accelerograms for Rapid Time History Analysis Based on the Impulsive Load Concept

000015904 24630 $$n34.$$pComputational Methods in Structural Dynamics and Earhquake Engineering
000015904 260__ $$bNational Technical University of Athens, 2013
000015904 506__ $$arestricted
000015904 520__ $$2eng$$aRegarding that the time history analysis, as the most realistic seismic response analysis method, is very time consuming, in this paper a method is proposed for simplification of digitized accelerograms by using the concept of impulsive load. In the proposed method, the accelerogram, which is actually a numerical array with the time step size of 0.02, 0.01 or even 0.005 seconds, and usually contains several thousands of time steps with their corresponding acceleration values, is substituted by a limited number (usually less than just a few hundreds) of discrete values, each one equivalent to the area created by the acceleration curve and the time axis between two of its subsequent zero-crossings. These discrete values, which are obviously positive and negative one after the other, multiplied by the mass of the SDOF system, can be considered as a series of impulsive loads, applied consequently to the system, which is subjected to the base acceleration. Using the simple formula of response to impulsive load, response of the SDOF system to base acceleration can be calculated as the summation of its responses to the series of impulsive loads, created by the described method for any given accelerogram. Several numerical examples are presented in the paper to show the efficiency of the proposed simplification technique. Numerical results show that the amount of error of peak response calculation is usually less than 5% for most of earthquake records, while the required time for response calculations is generally only 10% of that of the conventional time history analysis, or even less than that.

000015904 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000015904 653__ $$aDigitized accelerograms; Time history analysis; Time step size, Calculation time

000015904 7112_ $$aCOMPDYN 2013 - 4th International Thematic Conference$$cIsland of Kos (GR)$$d2013-06-12 / 2013-06-14$$gCOMPDYN2013
000015904 720__ $$aHosseini, M.$$iMirzaei, I.
000015904 8560_ $$ffischerc@itam.cas.cz
000015904 8564_ $$s758579$$uhttps://invenio.itam.cas.cz/record/15904/files/1670.pdf$$yOriginal version of the author's contribution as presented on CD, section: CD-MS 29 ACCURACY AND COMPUTATIONAL EFFICIENCY IN DYNAMIC/SEISMIC STRUCTURAL ANALYSIS
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000015904 962__ $$r15525
000015904 980__ $$aPAPER