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A platform for research: civil engineering, architecture and urbanism
Improvement of Building Resilience by Viscous Dampers
Abstract In recent years, structural control strategies have been very important in earthquake and wind resistant designs in the world. In the classical period, structures were designed only for vertical loads. The modern period brought about dynamic calculation methods and applications. The current period, which can be regarded as the postmodern period, is based on the principle of controlling the behaviour of buildings with active and passive elements. The optimal location and size of these technological elements within a structure need to be determined. In this study, some methods of determining the optimum placement of viscous dampers, which are one of the most-known passive dampers, are summarised. Transfer functions for the optimisation of viscous dampers have been used in many studies, and many sophisticated methods have been proposed. In the methods mentioned in this study, while the location and amount of the dampers are investigated, the equations of motion are transformed into frequency domain, and the structural behaviours are given depending on the frequency and other structural parameters. Different objective functions; the sum of inter-storey drifts or top displacement, base shear force and top peak absolute acceleration are selected as the objective functions. In this study, the fundamental mode response of the structure is considered. The damping coefficients of the added dampers are design variables. The total damping coefficient is represented by an equality constraint, and there are some inequality constraints that represent the lower and upper limits of the damping coefficients of each added damper. Optimality conditions derived from the Lagrange Multipliers method are solved with the steepest direction search algorithm, and the optimum damper distribution is found. The designs for the different objective functions and the corresponding behaviours are compared. All optimum damper designs minimise their own objective functions. In a building design, optimum damper designs can be made using the objective function that corresponds to the most important behaviour. All designs show that the uniform design of the dampers is not better in terms of behaviour as well as construction and material cost, compared with the optimal designs.
Improvement of Building Resilience by Viscous Dampers
Abstract In recent years, structural control strategies have been very important in earthquake and wind resistant designs in the world. In the classical period, structures were designed only for vertical loads. The modern period brought about dynamic calculation methods and applications. The current period, which can be regarded as the postmodern period, is based on the principle of controlling the behaviour of buildings with active and passive elements. The optimal location and size of these technological elements within a structure need to be determined. In this study, some methods of determining the optimum placement of viscous dampers, which are one of the most-known passive dampers, are summarised. Transfer functions for the optimisation of viscous dampers have been used in many studies, and many sophisticated methods have been proposed. In the methods mentioned in this study, while the location and amount of the dampers are investigated, the equations of motion are transformed into frequency domain, and the structural behaviours are given depending on the frequency and other structural parameters. Different objective functions; the sum of inter-storey drifts or top displacement, base shear force and top peak absolute acceleration are selected as the objective functions. In this study, the fundamental mode response of the structure is considered. The damping coefficients of the added dampers are design variables. The total damping coefficient is represented by an equality constraint, and there are some inequality constraints that represent the lower and upper limits of the damping coefficients of each added damper. Optimality conditions derived from the Lagrange Multipliers method are solved with the steepest direction search algorithm, and the optimum damper distribution is found. The designs for the different objective functions and the corresponding behaviours are compared. All optimum damper designs minimise their own objective functions. In a building design, optimum damper designs can be made using the objective function that corresponds to the most important behaviour. All designs show that the uniform design of the dampers is not better in terms of behaviour as well as construction and material cost, compared with the optimal designs.
Improvement of Building Resilience by Viscous Dampers
Aydin, Ersin (author) / Noroozinejad Farsangi, Ehsan (author) / Öztürk, Baki (author) / Bogdanovic, Aleksandra (author) / Dutkiewicz, Maciej (author)
Resilient Structures and Infrastructure ; 105-127
2019-01-01
23 pages
Article/Chapter (Book)
Electronic Resource
English
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