Performance-based optimisation of RC frames with friction wall dampers using a low-cost optimisation method

Abstract

A bs tr ac t Friction-based dampers can be considered as one of the suitable passive control systems for seismic strengthening and rehabilitation of existing substandard structures due to their high adjustability and good energy dissipation capability. One of the main issues in the design of these systems is to obtain the magnitude of t h e ma xi mu m slip force and the distribution of slip forces along the height of the building. In this study, a practical performance-based optimisation methodology is developed for seismic design of RC frame buildings with friction energy dissipation devices, which allows for an accurate solution at low computational cost. The proposed method a ims at distributing the slip loads of the friction dampers to achieve a uniform distribution of damage along the height of the building. The efficiency of the method is evaluated through the optimum design of five different low to high-rise RC frames equipped with friction wall dampers under six natural and six synthetic spectrum-compatible earthquakes. Sensitivity analyses are performed to assess the reliability of the method using different initial height-wise slip load distributions, convergence parameters and earthquake records. The results indicate that optimum frames exhibit less maximum inter-storey drift (up to 43%) and global damage index (up to 75%), compared to uniform slip load distribution. The method is then developed to obtain the optimum design solution for a set of earthquakes representing a design spectrum. It is shown that the proposed method can provide an efficient tool for optimum seismic design of RC structures with friction energy dissipation devices for practical purposes.

Practical method for optimal rehabilitation of steel frame buildings using buckling restrained brace dampers

“…However, they have some drawbacks such as convergence to local optimal solutions, difficult implementation, high computational effort needed to calculate derivatives of the objective functions at each load step and susceptibility to numerical noise [25,26]. More recently, Nabid et al [27,28] developed a practical method for more efficient design of friction-based wall dampers and showed that the energy dissipation capacity of the dampers can be significantly increased by using a more appropriate distribution of friction forces. Altieri et al [29] also used a linear approximation method (COBYLA) for reliability-bases optimal design of nonlinear viscous dampers for enhancing the seismic performance of steel moment resisting frames.…”

Numerical evaluation of a novel passive variable friction damper for vibration mitigation

“…On the other hand, with small activation forces, the sliding interfaces will not be effective. To address this limitation, some researchers have proposed optimization algorithm to obtain an optimum activation force over the height of the buildings [23,24,25]. Also, several damping systems have been proposed to modulate the normal force of the friction damper through an external force input, termed variable friction devices [18,26,27,28].…”

Dynamic loading tests and seismic response analysis of a stud‐type damper composed of multiple friction units with disc springs

“…Various types of friction device have been proposed and developed, including translational motion devices, [4][5][6][7][8][9][10][11] rotational motion devices, [11][12][13] beam column joint devices, [14][15][16] and other devices. 9,17,18 The seismic response behavior of friction-damped (FD) systems has been experimentally investigated, [19][20][21] design methods and analytical studies have been reported, [22][23][24][25][26][27][28][29] and the installation of devices into actual building structures has been performed. 30,31 In addition, research on frictional devices with disc springs has been presented.…”