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Earthquake Protection for Buildings, Machinery and other Equipment
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Shaking Table Testing of a Steel Frame Structure without and with GERB Prestressed Damping Devices (PDF, 717 KB)
A five story, three bay steel frame structure with and without newly developed GERB Prestressed Damping Devices (PDD) has been tested on a 5 x 5 m biaxial seismic shaking table at the Institute of Earthquake Engineering and Engineering Seismology, Skopje, R. Macedonia. A hypothetical 5 story steel frame structure was designed in accordance with Eurocode3 and Eurocode8 requirements for design response spectrum calculated for soil type B, PGA=0.20 g and behaviour factor q=4. The structure has been tested by simulation of real earthquake time histories with different intensities for two conditions: a) structure without PDDs and b) four configurations of the same structure having different position of PDDs through the bays and along its and height.
Published: July 2010
5th World Conference on Structural Control and Monitoring
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Comparative Seismic Performance of a Base Control System based on measured and calculated Responses (PDF, 3,349 KB)
This paper deals with finite element (FE) models of two similar buildings, one constructed with a traditional fixed-base foundation and the other provided with a Base Control System (BCS). The two instrumented buildings, which are practically identical 3-story reinforced concrete structures, are located in Mendoza, Argentina. The accelerometers recorded the response due to a 5.7 magnitude earthquake that shook the buildings on August 5, 2006. The BCS, developed by Gerb GmbH in Germany, consists of a combination of helical springs and viscous dampers. Numerical models were used to carry out a comprehensive comparison of the seismic response of the two buildings and to evaluate the performance of the isolation system.
Published: October 2008
The 14th World Conference on Earthquake Engineering
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Elastic Support Systems for the Preservation of Cultural Heritage (PDF, 227 KB)
The paper deals with elastic support systems which are frequently used to protect structures against the interaction with the subsoil.
The structure is elastically or dynamically uncoupled from the static or dynamic behaviour of the foundation. These technologies are usually used for new structures but they can also be applied for existing ones. Here, this task is much more complex as the structure may be very sensitive and is not allowed to experience any damage from the corresponding construction work.
Properties of spring elements and dampers are described and details of executed projects are discussed.
Published: October 2007
International Symposium on Studies on Historical Heritage
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Pipework Dampers
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Resolving of Steam and Feed-Water Piping Vibration Matter at Loviisa NPP (PDF, 396 KB)
The paper describes a piping operational vibration problem has been resolved at the Loviisa Nuclear Power Plant main steam (RA) and feed-water (RL) lines. Excessive piping vibration occurred as the result of an essential increasing of working media flow in piping due to 10% upgrading of the Unit 1 and Unit 2 reactors power capacity. Piping flow induced vibration in several cases has been significantly higher codes’ recommended thresholds levels and NPPs best operational practice.
The project covers 3D vibration measurements and walkdowns of RA and RL lines with its support system, developing of dynamic finite element models of piping with vibration parameters close to obtained experimental data. In result vibration protective measures has been developed based on implementation of High Viscous Dampers Technology (HVD). An optimum minimal number and location of VES and VD high viscous dampers has been determined and then installed at the lines. Finally an essential vibration reduction of the examined systems has been achieved.
Published: August 2007
19th International Conference on Structural Mechanics in Reactor Technology
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Tuned Mass Damper Systems
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Application of Tuned Mass Control Systems for Earthquake Protection (PDF, 620 KB)
The following paper introduces the practical application of Tuned Mass Control Systems (TMCS) for earthquake protection. Optimization approaches for these passive control systems will be discussed as well as practical considerations regarding the resulting specification of the TMCS such as stiffness loss during an earthquake and wide-band effectiveness. For the discussion, theoretical approaches will be introduced and results of additional numerical calculations will be presented to verify the reduction due to the control systems. The contribution also introduces the practical application of TMCS at an elevated bridge structure and presents design solutions for these systems.
Published: September 2010
IABSE Venice 2010
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