000022009 001__ 22009
000022009 005__ 20170622131318.0
000022009 04107 $$aeng
000022009 046__ $$k2017-06-15
000022009 100__ $$aVakakis, Alexander
000022009 24500 $$aPASSIVE BLAST AND SEISMIC MITIGATION OF LARGE-SCALE CIVIL INFRASTRUCTURE BY IMPLEMENTATION OF INTENTIONAL STRONG NONLINEARITY

000022009 24630 $$n6.$$pComputational Methods in Structural Dynamics and Earhquake Engineering
000022009 260__ $$bNational Technical University of Athens, 2017
000022009 506__ $$arestricted
000022009 520__ $$2eng$$aWe implement intentional strong nonlinearity for targeted energy transfer - TET and passive energy management in a structural design. By nonlinear TET [1] we denote passive, nearly one-way transfer of blast energy from an excited primary system to a set of local, dissipative and essentially nonlinear (i.e., nonlinearizable) attachments (termed nonlinear energy sinks – NESs) where energy is spatially confined and locally dissipated. Although the NESs are local devices, due to their strong nonlinearity can affect the global dynamics of the primary system over broad frequency and energy ranges, acting as passive, broadband and adaptive boundary controllers, tunable with energy. Moreover, there is passive redistribution of induced energy within the modal structure of the system through directed energy exchanges between sets of linear modes or to nonlinear modes induced by the strong nonlinearity. We will discuss blast mitigation of a ninestory structure weighting 10 tons, specifically built for this series of blast tests. A passive mitigation system of six NESs is deployed on the upper two floors of the structure; two NESs have vibro-impact nonlinearities, and the other four have smooth but essentially nonlinear stiffnesses (see Figure 1). Experimental tests proove the capacity of this passive nonlinear mitigation system to rapidly and efficiently attenuate the structural response, even starting at the first response cycle, thus minimizing the peak demand on the structure. This is achieved by nonlinear redisribution of the blast energy within the modal space through low-to-high energy scattering caused by the actions of the NESs. The experimental blast tests will be discussed [2]. This application highlights the unique and unprecedented options for design that the use of intentional strong nonlinearities can offer.

000022009 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000022009 653__ $$a

000022009 7112_ $$aCOMPDYN 2017 - 6th International Thematic Conference$$cRhodes Island (GR)$$d2017-06-15 / 2017-06-17$$gCOMPDYN2017
000022009 720__ $$aVakakis, Alexander
000022009 8560_ $$ffischerc@itam.cas.cz
000022009 8564_ $$s486679$$uhttps://invenio.itam.cas.cz/record/22009/files/19191.pdf$$yOriginal version of the author's contribution as presented on CD, section: [plenary] Plenary
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000022009 962__ $$r21500
000022009 980__ $$aPAPER