000011066 001__ 11066
000011066 005__ 20141205155832.0
000011066 04107 $$aeng
000011066 046__ $$k2008-10-12
000011066 100__ $$aMosqueda, Gilberto
000011066 24500 $$aIntegration Methods for Improved Stability and Accuracy of Hybrid Simulations

000011066 24630 $$n14.$$pProceedings of the 14th World Conference on Earthquake Engineering
000011066 260__ $$b
000011066 506__ $$arestricted
000011066 520__ $$2eng$$aTwo novel implementation methods of implicit integration procedures for hybrid simulation are presented. The first solves the equation of motion using a fully implicit iterative formulation. The experimental restoring force for each iterative displacement is estimated from curve-fitting of recent force-displacement measurements, avoiding physical iterations on the experimental substructures. For steps that do not converge, the procedure defaults to an explicit formulation. The second integration procedure is a modified operator-splitting integration scheme with two enhancements: a new formulation for the prediction phase with improved accuracy, and the use of an estimated tangent stiffness matrix of the experimental substructure to improve the accuracy of the correction step. A procedure for estimating the experimental tangent stiffness matrix is presented; it is updated only in the steps with significant displacement increments, and remains unchanged otherwise to ensure that the quality of measured data is reliable. Both integration procedures have been successfully implemented experimentally and shown to improve the stability and accuracy of hybrid simulations. Numerical and experimental simulations demonstrate the effectiveness of these integration schemes, especially in utilization of longer time steps, prevention of excitation of higher modes, and testing of stiff and highly nonlinear systems. Improvements in accuracy are demonstrated by measuring the energy balance in the equation of motion.

000011066 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000011066 653__ $$aHybrid simulation, Numerical integration, Implicit integration, Tangent stiffness

000011066 7112_ $$a14th World Conference on Earthquake Engineering$$cBejing (CN)$$d2008-10-12 / 2008-10-17$$gWCEE15
000011066 720__ $$aMosqueda, Gilberto$$iAhmadizadeh, Mehid
000011066 8560_ $$ffischerc@itam.cas.cz
000011066 8564_ $$s261868$$uhttps://invenio.itam.cas.cz/record/11066/files/12-03-0062.pdf$$yOriginal version of the author's contribution as presented on CD, Paper ID: 12-03-0062.
000011066 962__ $$r9324
000011066 980__ $$aPAPER