Tuned Mass Damper Essay

6576 words - 26 pages

Student ID: 2150586 PM505 - 2T(FEB) Tutor: Barbara HowarthModule Code: PM 505 - 2T(February)Class Group: Group ZModule Title: Research project (science and engineering)Assessment: Research projectAssignment Title: comparative and combination of two seismic control systems tuned mass damper and base isolationWord count: 6187Tutor Name: Barbara HowarthDate of Submission: July 17th, 2014AbstractEarthquakes is a sudden violent shaking of the ground cause by a slip on a fault of the Earth's crust. When earthquakes occurred, seismic waves are created which is translated into dynamic forces resulting in vibration to any structure that attached to the ground (Cheng et al., 2008:2). Depend on the magnitude of the earthquake, the number of casualties and the amount of damages can be enormous. Structure technologies are continuously improving in order to cope with this natural disaster. While conventional strategies of increasing stiffness of the system consume more materials and energy, alternative strategies such as passive seismic control systems are found to be more effective and more economical (Julie et al., 2008:1). This study focuses on the performance evaluation of two passive seismic control systems tuned mass damper and base isolation in vibration control of multi-storied building. In general, stumbling block of each system has been revealed as base isolation structures tend to be vulnerable to long period ground motions due to resonances and tuned mass damper systems are less effective in short period range (De Iuliis et al., 2008:1). This fact leads to an equal important task of combining both techniques into a unique system. Investigation of the proposed system theoretically and practically proved to be superior to a single separate one. This paper provides a promising alternative solution for seismic control strategy thereby reducing damages of future earthquake. However as only passive techniques were investigated, active systems are recommended for more comprehensive future study.IntroductionThe tragic consequences of the recent earthquakes in Haiti, Chile and japan have underscored the tremendous importance of the way in which buildings respond to seismic forces. In the last two decades, significant effort has been made to develop possible vibration control strategies in the design of engineering structures thereby increasing their safety and reliability against strong earthquakes (Ulbrich et al., 2009). These control approaches are often advantage of being able to modify the dynamic response of a structure in a desirable manner. To date, there exist two main seismic control system concept which are widely used, namely tuned mass damper and base isolation.Nonetheless, a survey carried by Kani (2006) cited in Monfared et al. (2012) reveals that 30% of apartments in Japan with base isolation systems suffered damage after earthquake. He also claims that number seem to be too much for a specialize earthquake control system. Another report from...

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