Structural vibration control

  Building cross sections with damper Copyright: © LBB

For the mitigation of vibrations, structures must comply with the basic principles of the structural design criteria. On existing structures this can only be applied after extensive construction procedures. Modern buildings usually do not satisfy these structural demands, as these structures are getting more filigree because of the rising architectural and economic challenges. A typical example is the Millennium Bridge in London, which is closed a few days after the opening ceremony because of structural vibration problems. For the prevention of vibration problems it is necessary to use auxiliary damper systems. The Chair of Structural Analysis and Dynamics works intensively on the research and development of new structural control measures, which also include semiactive damper systems. It is well-known, that the dynamic properties of a structure shift by temperature influence, stiffness degradation and changes of the ground properties. This can cause a major loss of the efficiency of the conventional passive damper systems. The semiactive damper systems do not have this deficiency, as they can register the actual condition of the structure permanently and adapt themselves to the new system conditions. This is a decisive advantage compared to the limited functioning passive measures. For the verification of the efficiency of the developed methods the chair performs also in an interdisciplinary cooperation with other research institutes numerical simulations and experimental test.