Designing Optimum Locations and Properties of MTMD Systems. (2015) - Frans, Richard
Abstract: Reducing vibration of buildings during earthquake is of the primary concern to most structural engineers. Several methods have been proposed including the use of damper systems. This paper considers the optimization procedures of multi tuned mass damper (MTMD) systems. A number of researches have considered designing MTMD systems to reduce structural response during earthquake. However, most of the research considered only the properties of the MTMD, while the locations of MTMD are decided beforehand. This paper considers the optimization both the properties and location of MTMD in structures. The hybrid coded genetic algorithms (HCGAs) are used to optimize the dampers. The HCGAs are the optimization method that utilize binary coded GAs (BCGAs) and real coded GAs (RCGAs). The RCGAs are used to optimize the properties of MTMD, while the BCGAs are utilized to optimize the location of the dampers. Numerical examples are then carried out to see the ability of the proposed method in optimizing the locations and the properties of the dampers. Numerical examples are carried out to a three, ten-, and forty-story buildings. For the three- and ten-story buildings, the location of the MTMD is obtained at the top of the buildings, whereas for forty-story building the location of the dampers is depending on the mass ratio of the dampers. For 1% mass ratio, the locations of the dampers, are at the 39 th and 40 th floors, respectively. For 2% mass ratio, the dampers locations are obtained at the 38th and 40th floor, respectively; while for 4% mass ratio, the dampers locations are at 37 th and 40 th floors, respectively. Numerical simulations show the effectiveness of MTMD systems in reducing response of structures due to earthquake.