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[myo]tensionBridge previous
  FA ČVUT winter term 09/10


.project graphics
  • studio
    . FLOW_Glass-Freeform architecture, Faculty of Architecture ČVUT, Prague
  • consultants
    . Miloš Florián, Lukáš Kurilla

. Bratislava's Old Bridge has been closed for car trafic on 31st of december 2008. Since then only public transport and pedestrians are allowed to use the bridge. Despite it's rich history, the bridge's girder system built after WWII by the Red army, is no longer stable. Bratislava's city council is trying to fixt the deteriorating state, but replacemet seems inevitable.

. Redesign process considers two separate approaches. My vision is of a homogeneous interacting system equal in it's function and aesthetics. The aestethics of human body depends greatly upon it's physical fitness and it's muscle structure is one of the key factors. The symbiosys between functinon and aesthetics of a muscle can be well observed, regarding the beauty of a human body. The adaptation of macrostructure in project's early stages seemed to have some major disadvantages, mainly dificulties with structure motion. Muscle's microstructure theory turned out to be more appropriate during the design process, allowing the bridge to adapt it's height upon fluctuating river level and thus allowing to maintain constant traffic flow on and over Danube river.

. Concept is based on interaction between actin and myozin myofilaments represented by continuous strip elements. According to the myofilament principle a dense shell of actin and myozin has been generated, which is able to adjust it's deflection while expanding myozine components.

. Myozine strips are bimetals featuring active and passive layer. The passive is an alloy of nickel-cobalt-iron called Superinvar. The active layer of iron-nickel-manganese-copper is applied on the strip's deflected waist area. Heated bimetal is able to adjust deflection of myozine strip and thus expand in length. While each myozine component expands only minimal, the overall force results in affecting the bridge's body completly.

. Bridge deck design consists of two systems. The deck plates are based on Tesselated forms [] in combination with fluid bearings, which ensure contactless sliding between layer sheets. Tensairity Airbeam system creates support under the tesselated plates, using low preassure air to stabilize compression elements against buckling [Dr. Mauro Pedretti Tensairity report].

. Piezoelectric nanogenerators research at Georgia Institute of Technology in Atlanta came with the idea to harvest redundant mechanical energy in form of vibrations and turn it into electricity [Georgia Tech piezoelectric ZnO nanowires report]. While applying stress, which results in elastic deformation of ZnO nanowires, a piezoelectric potential is being generated. The charged particles are then redirected, generating a flow of electric energy. Creating fields of nanowires between deck plates may be a way of buiding a self-powered nano system within the bridge structure.