000019282 001__ 19282
000019282 005__ 20170118182308.0
000019282 04107 $$aeng
000019282 046__ $$k2017-01-09
000019282 100__ $$aShmerling, Assaf
000019282 24500 $$aOptimal Gains in Mass, Stiffness and Added Damping for Seismic Upgrade of Frame Structures

000019282 24630 $$n16.$$pProceedings of the 16th World Conference on Earthquake Engineering
000019282 260__ $$b
000019282 506__ $$arestricted
000019282 520__ $$2eng$$aA novel approach for the seismic retrofit of linear frame structures is presented and described. Use is made of optimal control theory to attain structural changes in stiffness coefficients, changes in mass and supplemental damping. An optimization problem that is required to satisfy constraints on maximum total story accelerations and maximum interstory is formulated. The general system interconnections paradigm is introduced as a closed-loop control system with a passive controller that consists of the structural changes and has simulated feedback on the structural response and seismic excitation. The cost function minimizes the H∞ norm of the maximum closed-loop response, single-input single-output (SISO) transfer function case. The first-order steepest descent of Apkarian and Noll [1] is introduced, utilized and enhanced to solve the optimization problem. A numerical example of a 9-story shear-type building is studied. Optimal changes in mass, stiffness and damping that are obtained, show significant improvement in the peak dynamic response. The results clearly indicate the efficiency of the proposed methodology that possesses the capability of attaining optimal changes in all of the structure’s physical characteristics (mass, stiffness, damping) while adhering to preassigned maximum response levels.

000019282 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000019282 653__ $$aEarthquake engineering; upgrade of structures; changed mass damping and stiffness; H-infinity norm

000019282 7112_ $$a16th World Conference on Earthquake Engineering$$cSantiago (CL)$$d2017-01-09 / 2017-01-13$$gWCEE16
000019282 720__ $$aShmerling, Assaf$$iLevy, Robert
000019282 8560_ $$ffischerc@itam.cas.cz
000019282 8564_ $$s317393$$uhttps://invenio.itam.cas.cz/record/19282/files/329.pdf$$yOriginal version of the author's contribution as presented on USB, paper 329.
000019282 962__ $$r16048
000019282 980__ $$aPAPER