000019274 001__ 19274
000019274 005__ 20170118182307.0
000019274 04107 $$aeng
000019274 046__ $$k2017-01-09
000019274 100__ $$aShmerling, Assaf
000019274 24500 $$aA Methodology for Seismic Retrofit Using Optimal Control

000019274 24630 $$n16.$$pProceedings of the 16th World Conference on Earthquake Engineering
000019274 260__ $$b
000019274 506__ $$arestricted
000019274 520__ $$2eng$$aThis paper proposes a new seismic modification methodology for optimal design of multistory frame structures to avoid damage and attain a robust response to extreme hazards. The methodology determines added damping devices of optimal size at strategic locations and modifies story stiffnesses, by solving a newly formulated constrained optimization problem. The objective is to minimize a cost function representing total energy while satisfying the equations of motion and allowable interstory drifts for given severe ground motions. The proposed methodology combines the classical Linear Quadratic Regulator (LQR), which searches for an optimal gain matrix, with the analysis-redesign procedure of Levy and Lavan [1] to produce a Robust Analysis Redesign (RAR) iterative approach. A new algorithm approximates the equivalent stiffness to fit the displacement gains. At convergence, the RAR procedure will yield optimal sizing and new topology for the designed system. The RAR procedure is developed here for shear structures. However, RAR can be utilized for complex structures by modeling them first as equivalent shear-type structures having stiffness properties that yield the same maximum interstory drifts for the given records. Two numerical examples of shear-type structures are examined. These examples use structures already having an “optimal” configuration which are further optimized using the methodology developed herein. In addition, a numerical example comprised of a 10-story MRF structure is presented to illustrate the use of the equivalent shear structure approach. The results of the exemplified retrofitted MRF structure show great improvements in its dynamic response.

000019274 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000019274 653__ $$aEarthquake engineering; optimal control; added stiffness and damping; robustness

000019274 7112_ $$a16th World Conference on Earthquake Engineering$$cSantiago (CL)$$d2017-01-09 / 2017-01-13$$gWCEE16
000019274 720__ $$aShmerling, Assaf$$iLevy, Robert$$iReinhorn, Andrei
000019274 8560_ $$ffischerc@itam.cas.cz
000019274 8564_ $$s298699$$uhttps://invenio.itam.cas.cz/record/19274/files/328.pdf$$yOriginal version of the author's contribution as presented on USB, paper 328.
000019274 962__ $$r16048
000019274 980__ $$aPAPER