000012111 001__ 12111
000012111 005__ 20141205160020.0
000012111 04107 $$aeng
000012111 046__ $$k2008-10-12
000012111 100__ $$aWu, Bin
000012111 24500 $$aPerformance of Equivalent Force Control Method for Real-Time Substructure Testing

000012111 24630 $$n14.$$pProceedings of the 14th World Conference on Earthquake Engineering
000012111 260__ $$b
000012111 506__ $$arestricted
000012111 520__ $$2eng$$aThe equivalent force control (EFC) method has been developed for real-time substructure testing (RSTing) with implicit integration to replace the numerical iterative process with a feedback control. This paper addresses two issues concerning the performance of this method. One is the determination of the force-displacement conversion factor (a key component of EFC) for nonlinear specimens. The analysis conducted here shows that the force-displacement conversion factor is largely governed by the mass and damping properties of the numerical substructure and the properties of the numerical scheme when a small integration time interval is used. Otherwise, the factor has to be determined with the secant stiffness of the specimen and of the numerical substructure if a PD controller is used for EFC. The other issue is the overshooting problem which may arise for multi-degree-of-freedom structures due to the relatively quick response feedback from the numerical substructure in the closed-loop EFC. It is shown that this problem can be resolved by reducing either the EFC gains or the increment size of the equivalent force command. The analytical studies on these two issues are verified by RSTs conducted on structural models with buckling restrained braces and an offshore platform with Magnetorheological dampers.

000012111 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000012111 653__ $$areal-time substructure test, hybrid simulation, equivalent force control, implicit integration, pseudodynamic test

000012111 7112_ $$a14th World Conference on Earthquake Engineering$$cBejing (CN)$$d2008-10-12 / 2008-10-17$$gWCEE15
000012111 720__ $$aWu, Bin$$iXu, Guoshan$$iLi, Y.$$iShing, P.B.$$iOu, J.P.
000012111 8560_ $$ffischerc@itam.cas.cz
000012111 8564_ $$s441247$$uhttps://invenio.itam.cas.cz/record/12111/files/12-03-0086.pdf$$yOriginal version of the author's contribution as presented on CD, Paper ID: 12-03-0086.
000012111 962__ $$r9324
000012111 980__ $$aPAPER