Configuration optimization of dampers for adjacent buildings under seismic excitations

Bigdeli, Kasra; Hare, Warren; Tesfamariam, Solomon

doi:10.1080/0305215x.2012.654788

Cited by 31 publications

(28 citation statements)

References 32 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Therefore, seismically isolated structures need to be designed to perform successfully under both near-fault and far-fault types of earthquake, requiring an optimum solution. Solutions such as passive coupling of adjacent structures via optimally arranged dampers (Bigdeli, Hare, and Tesfamariam 2012) or seismic isolation systems making use of semi-active damping (Symans and Constantinou 1999;Yang and Agrawal 2002;Alhan, Gavin, and Aldemir 2006;Mehrparvar and Khoshnoudian 2012) have been proposed and are still being actively investigated by researchers; however, because of its many advantages, including but not limited to ease of implementation and design, an optimization of passive seismic isolation which presents the best performance in case of both near-fault and far-fault earthquakes may provide a preferable alternative solution.…”

Section: Introductionmentioning

confidence: 99%

Optimization of seismic isolation systems via harmony search

Niğdeli

Bekdaş

Alhan

2013

Engineering Optimization

View full text Add to dashboard Cite

In this article, the optimization of isolation system parameters via the harmony search (HS) optimization method is proposed for seismically isolated buildings subjected to both near-fault and far-fault earthquakes. To obtain optimum values of isolation system parameters, an optimization program was developed in Matlab/Simulink employing the HS algorithm. The objective was to obtain a set of isolation system parameters within a defined range that minimizes the acceleration response of a seismically isolated structure subjected to various earthquakes without exceeding a peak isolation system displacement limit. Several cases were investigated for different isolation system damping ratios and peak displacement limitations of seismic isolation devices. Time history analyses were repeated for the neighbouring parameters of optimum values and the results proved that the parameters determined via HS were true optima. The performance of the optimum isolation system was tested under a second set of earthquakes that was different from the first set used in the optimization process. The proposed optimization approach is applicable to linear isolation systems. Isolation systems composed of isolation elements that are inherently nonlinear are the subject of a future study. Investigation of the optimum isolation system parameters has been considered in parametric studies. However, obtaining the best performance of a seismic isolation system requires a true optimization by taking the possibility of both near-fault and far-fault earthquakes into account. HS optimization is proposed here as a viable solution to this problem.

show abstract

Section: Introductionmentioning

confidence: 99%

Optimization of seismic isolation systems via harmony search

Niğdeli

Bekdaş

Alhan

2013

Engineering Optimization

View full text Add to dashboard Cite

show abstract

“…Such a result has also been confirmed by experimental testing on 2 building models of 1:4 length scale, connected by linear fluid dampers, conducted by a seismic simulator. 17 Bigdeli et al 18 have investigated 5 alternative approaches to identify the optimal arrangement of a limited number of dampers which minimize the interstory drifts, showing that increasing the number of devices does not necessarily improve the efficiency of the intervention.…”

Section: Introductionmentioning

confidence: 99%

Seismic performance of buildings retrofitted with nonlinear viscous dampers and adjacent reaction towers

Impollonia

Palmeri

2018

Earthq Engng Struct Dyn

View full text Add to dashboard Cite

Summary An effective strategy of seismic retrofitting consists of installing nonlinear viscous dampers between the existing building, with insufficient lateral resistance, and some auxiliary towers, specially designed and erected as reaction structures. This allows improving the seismic performance of the existing building without any major alteration to its structural and nonstructural elements, which makes this approach particularly appealing for buildings with heritage value. In this paper, the nonlinear governing equations of the coupled lateral‐torsional seismic motion are derived from first principles for the general case of a multistory building connected at various locations in plan and in elevation to an arbitrary number of multistory towers. This formulation is then used to assess the performance of the proposed retrofitting strategy for a real case study, namely, a 5‐story student hall of residence in the city of Messina, Italy. The results of extensive time‐history analyses highlight the key design considerations associated with the stiffness of the reaction towers and the mechanical parameters of the nonlinear viscous dampers, confirming the validity of this approach.

show abstract

“…Considerable research has been reported on different damping devices, confirming the efficiency of damper connectors in mitigating the vibrations of structures [33,36,8,28,9,25,38,39,35,37,25,34,35]. The research on optimizing damper connections between adjacent buildings can be categorized into two categories: the placement of dampers; and the determination of mechanical properties for dampers [11,10]. The mechanical properties of dampers can be further subdivided into the kind of dampers used and the optimal damper coefficients required (see [10,26] or Section 3.1 herein for further details on damper coefficients).…”

Section: Introductionmentioning

confidence: 99%

“…The research on optimizing damper connections between adjacent buildings can be categorized into two categories: the placement of dampers; and the determination of mechanical properties for dampers [11,10]. The mechanical properties of dampers can be further subdivided into the kind of dampers used and the optimal damper coefficients required (see [10,26] or Section 3.1 herein for further details on damper coefficients). This paper focuses on the combined optimization of both the placement of dampers and the corresponding damper coefficients.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Optimizing damper connectors for adjacent buildings

et al. 2015

View full text Add to dashboard Cite

Many theoretical and experimental studies have used heuristic methods to investigate the dynamic behaviour of the passive coupling of adjacent structures. However, few papers have used optimization techniques with guaranteed convergence in order to increase the efficiency of the passive coupling of adjacent structures. In this paper, the combined problem of optimal arrangement and mechanical properties of dampers placed between two adjacent buildings is considered. A new bi-level optimization approach is presented. The outer-loop of the approach optimizes damper configuration and is solved using the "inserting dampers" method, which was recently shown to be a very effective heuristic method. Under the assumption that the dampers have varying damper coefficients, the inner-loop finds the optimal damper coefficients by solving an n-dimensional optimization problem, where derivative information of the objective function is not available. Three different non-gradient methods are compared for solving the inner loop: a genetic algorithm (GA), the mesh adaptive direct search (MADS) algorithm, and the robust approximate gradient sampling (RAGS) algorithm. It is shown that by exploiting this new bi-level problem formulation, modern derivative free optimization techniques with guaranteed convergence (such as MADS and RAGS) can be used. The results indicate a great increase in the efficiency of the retrofitting system, as well as the existence of a threshold on the number of dampers inserted with respect to the efficiency of the retrofitting system.

show abstract

Configuration optimization of dampers for adjacent buildings under seismic excitations

Cited by 31 publications

References 32 publications

Optimization of seismic isolation systems via harmony search

Optimization of seismic isolation systems via harmony search

Seismic performance of buildings retrofitted with nonlinear viscous dampers and adjacent reaction towers

Optimizing damper connectors for adjacent buildings

Contact Info

Product

Resources

About