POSSIBLE MEASURES OF TAKING-OVER/ DYNAMIC CONTROL OF SEISMIC ACTIONS APPLICABLE TO URBAN UTILITY SYSTEMS. SEISMIC WAVES DEFLECTION/ DAMPING USING METAMATERIALS

Abstract

Nowadays, an accurate seismic prediction regarding the date, location and magnitude is still a challenge, thing that implies taking into consideration efficient, preventive, seismic risk management measures, not only for civil buildings but also for urban utility systems UUS. The usually adopted measures regard at the same time conceptual solutions and immediately post-seism measures. At the present, within inhabited municipalities, UUS serve a relatively large number of beneficiaries being developed on relatively large areas with a high duty cycle. These systems may be exposed, during their functional life cycle to seismic effects. Taking into consideration the developing tendency of urbanization process, the preventive protection to earthquake of these city vital lines becomes extremely important. The UUS seismic risks are associated especially with the possibility of tightness loss as well as their integrity, with major consequences on Man-Goods- Environment, respectively: the population and consumers deprivation of vital resources, explosion generation, flooding; additional destabilization of ground; underground water infestation; local ecosystem threat, that may lead to important human lives and goods loss. These possible risks must be very carefully managed. The actual technical regulations do not cover the whole area of possible seismic risks of UUS. The recent discoveries regarding the solutions for a real time warning cannot always lead to a protection in due time. The international scientific community is more and more involved in developing several researches regarding efficient taking over measures, respectively dynamic control of seismic actions deflecting the seismic waves from the major risk area of degradation. These measures exploit the present scientific discoveries referring to a. total or partial, invisibility process to waves, of protected structures and, respectively, to the wave magnitude damping. In order to identify the solutions for the preventing seismic protection of UUS components, within the article there is presented a synthesis of possible measure, such as: invisibility cloak, invisibility textile and wave dampers, respectively

Keywords: urban utility systemsseismic risk managementinvisibility to seismic wavesmetamaterialsantiseismic shield