Abstract
With the advent of globalization, computing speed has increased tremendously, greatly advancing algorithm research in multiple fields. This paper studies the parameter optimization problem of the improved multipopulation genetic algorithm in the tuned mass damper (TMD) structure considering the soil-structure interaction (SSI) effect. The Newmark time-domain analysis method was used to analyze the dynamic response of a 40-story building under the excitation of EL Centro waves and Tangshan waves in China, respectively. The mass, damping coefficient, and spring stiffness of TMD system are used as the design variables of the controller. To reduce structural damage and obtain better comfort, the displacement response and acceleration response are optimized simultaneously in this paper, achieving multiobjective optimization. The results show that the improved multipopulation genetic algorithm method has faster convergence speed and greater accuracy than the traditional genetic algorithm; thus it can be applied to the TMDs parameter optimization of high-rise buildings. Besides, the soil types have a great influence on TMD parameter optimization and structural time history response. If ignoring SSI effect will lead to underestimation of parameter design, the reason is that the soft soil foundations can absorb a lot of seismic energy compared with rigid foundations and then reduce the effect of seismic excitation on the structure. The intention of the research helps researchers to better understand vibration control and provides suggestions for the application of TMD in high-rise buildings.
Highlights
With the increase of population, more and more high-rise buildings are coming into view
Structural vibration can be reduced by vibration isolation bearings, active control systems (such as active tuned mass dampers (ATMDs)), and passive control systems (such as tuned mass dampers (TMDs))
Tuned Mass Dampers (TMDs) are one of the passive control systems consisting of mass, stiffness, and damping components. ese devices are attached to structures to absorb the energy generated by structural vibration and mitigate structural damage. e Frahm damper, referred to as a TMD, was invented by Frahm in the early 20th century and patented around 1909 [6]; Ormondroyd and Hartog [7] added damping on this basis in 1928, which is the prototype of the initial TMD
Summary
With the increase of population, more and more high-rise buildings are coming into view. Bekdas et al [26] used the bat algorithm to optimize the design variables such as the mass, period, and damping ratio of the tuned mass damper, and the bat optimization method and genetic algorithm were applied for a ten-story civil structure. Khoshnoudian et al [29] studied the optimization design of passive tuned mass damper system considering soil-structure interaction. Is paper attempts to improve the traditional genetic algorithm to obtain faster calculation speed and accuracy and extends the aforementioned research works in the following three main aspects: (1) A mathematical model of the seismic response for high-rise buildings with TMDs considering SSI effect is established by numerical calculation. (3) e improved multipopulation genetic algorithm method is applied to search for the optimal TMD parameters (mass, stiffness, and damping) of the structural model considering the SSI effect. Is paper attempts to improve the traditional genetic algorithm to obtain faster calculation speed and accuracy and extends the aforementioned research works in the following three main aspects: (1) A mathematical model of the seismic response for high-rise buildings with TMDs considering SSI effect is established by numerical calculation. (2) e Newmark time-domain analysis method was used to analyze the dynamic response of a 40-story building under the excitation of EL Centro wave and Tangshan wave in China, respectively. (3) e improved multipopulation genetic algorithm method is applied to search for the optimal TMD parameters (mass, stiffness, and damping) of the structural model considering the SSI effect. e vibration reduction effect of TMD system with and without soil-structure interaction (SSI effect) is compared and the corresponding dynamic response of the high-rise structure is discussed. e results prove the effectiveness and feasibility of the improved genetic algorithm
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