Seismic performance of outrigger–belt truss system considering soil–structure interaction

Tavakoli, Reihaneh; Kamgar, Reza; Rahgozar, Reza

doi:10.1007/s40091-019-0215-7

Cited by 43 publications

(15 citation statements)

References 27 publications

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“…In the field of structural engineering, optimization techniques have been recently adopted to improve the overall response of tall buildings subject to critical excitations, for example, the design of tuned mass dampers [ 21–26 ] or the best location for outrigger systems. [ 27–30 ] A considerable effort has also been made by researchers to perform the topology optimization of tall building systems subject to stochastic excitation, that is, wind loads, seismic loads, or integrated hazards. [ 31–34 ]…”

Section: Introductionmentioning

confidence: 99%

An integrated topology optimization framework for three‐dimensional domains using shell elements

Angelucci

Spence

Mollaioli

2020

Structural Design Tall Build

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Summary In the last decades, topology optimization has been widely investigated as a preliminary design tool to minimize the use of material in a structure. Despite this, applications to realistic three‐dimensional engineering problems are still limited. This study provides the instruments for the definition of a versatile and integrated framework in order to apply topology optimization to large‐scale 3‐D domains for the design of efficient and high‐performing structures. The paper proposes a novel topology optimization strategy to identify the optimal layout of lateral resisting systems for tall buildings through the adoption of Mindlin–Reissner shell elements for the discretization of the continuum design domain. The framework is based on the practical interoperability between MATLAB, Ansys, and computer‐aided design (CAD) environments to incorporate optimization routines in the conceptual design phase of structural systems. Finally, the paper examines a three‐dimensional tall building case study in order to demonstrate the applicability of the proposed procedure to realistic Civil Engineering design problems and its robustness in finding optimal layouts free from mesh‐dependency instabilities.

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Section: Introductionmentioning

confidence: 99%

An integrated topology optimization framework for three‐dimensional domains using shell elements

Angelucci

Spence

Mollaioli

2020

Structural Design Tall Build

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“…Different parameters can be considered to obtain the best location of outrigger and belt truss system such as blast and seismic loading, soil‐structure interaction, and multirigid outrigger system. [ 19–22 ] Kamgar and Rahgozar [ 23 ] used the energy method and maximizing the strain energy of the outrigger system to determine the optimum location of the flexible outrigger systems in tall buildings with the assumption of constant cross‐sections, rotational springs as an outrigger, and the approximate wind load distribution. Considering different types of stiffnesses, a high‐rise braced frame was analyzed by Hoenderkamp and Bakker [ 24 ] to obtain the optimum location of outriggers.…”

Section: Introductionmentioning

confidence: 99%

Simultaneous size and topology optimization of 3D outrigger‐braced tall buildings with inclined belt truss using genetic algorithm

Farahmand‐Tabar

Ashtari

2020

Structural Design Tall Build

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To investigate the optimum location of the outrigger system, a metaheuristic-based size and topology optimization of the outrigger-braced tall buildings is carried out by various three-dimensional structural frames with different shapes of belt trusses. By considering the elastic behavior, the whole elements of the structural models such as beams, columns, core, and trusses are optimized simultaneously in conjunction with the location of the outrigger. Furthermore, to reach more optimality, several novel types of belt truss are proposed having inclined and inverse-inclined belt trusses with better structural and architectural features and optimum performance in comparison with the horizontal one. Different models with 25 to 40 stories having various span numbers are optimized using the genetic algorithm, and the results are compared with each other. In the modeling process, the exact wind load distribution is applied to the structure based on the ASCE7-16 rather than the uniform or triangular ones. According to the results, the optimum cross-sectional size and outrigger locations of different models are obtained, and it is indicated that the proposed novel belt trusses are optimal solution for the problem. K E Y W O R D S outrigger-braced building, size and topology optimization, inclined belt truss, genetic algorithm 1 | INTRODUCTION Tall buildings' development has been an important issue from recent centuries. The risk of vertical and horizontal load forces also increases by increasing the building height. Over certain height, an auxiliary system is needed for the moment-resisting frames with the braced core in order to become efficient to provide stiffness against seismic and wind loads. To achieve the considered strength and stiffness in the building, the lateral displacement should be controlled in the analysis and design of a tall building. One of the auxiliary systems which leads tall buildings to have sufficient stiffness is the outrigger system. Tall buildings with outriggers and belt trusses are a common solution for tall MRFs as they are easy to build and cheap in comparison with the other structural systems. Outriggers interact with peripheral columns through stiff arms. Under large lateral load, the core's rotation at the level of outriggers causes a tension-compression couple in the outer columns which reduces the core deflection utilizing the belt truss that distributes the force to whole peripheral columns. Optimization of tall buildings as a large-scale structure is essential due to a large amount of materials used in their construction. Reaching the optimum weight lowers the consumption of resources and saves a considerable amount of money. To achieve the optimal design, using metaheuristic algorithms in case of tall structures will be an arduous effort because of the high computational costs due to the massive modeling process. One of the crucial parameters that should be considered in the preliminary design steps is the optimum location of the outriggers. For the

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“…The dynamic response of a structure is determined using the spectrum and time history analysis methods [2]. Generally, for the seismic analysis of important structures [3][4][5] such as power plants, dams, tall buildings [6,7], control vibrations [8,9], and bridges, it is necessary to analyze the structure using time integration methods [2]. While this type of analysis is time-consuming, it is evident that the use of techniques that reduces the duration of dynamic analysis and the computational cost is important [10].…”

Section: Introductionmentioning

confidence: 99%

Wavelet-based Decomposition of Ground Acceleration for Efficient Calculation of Seismic Response in Elastoplastic Structures

Kamgar

Majidi

Heidari

2020

Period. Polytech. Civil Eng.

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The nonlinear dynamic analysis provides a more accurate simulation of the structural behavior against earthquakes. On the other hand, this analysis method is time-consuming since the time-step integration schemes are used to calculate the responses of the structure. Wavelet transform is also considered as one of the strong computing tools in studying the properties of the waves. The continuous wavelet transform is a time-frequency study and examines the frequency content of the waves while, the discrete wavelet transform is used to reduce sampling data and also to eliminate the noise of the waves. In this paper, the discrete and continuous wavelet transforms are used to reduce the wave sampling and therefore to reduce the required time for analysis. In this regard, eight near- and far- field earthquakes are studied. The frequency content of the earthquake is investigated by the Fourier spectrum and the continuous wavelet transform. The results show that the first five frequencies for the main earthquakes are similar to those values of earthquakes obtained by wavelet transform. Besides, it is shown that using wavelet transform for the main and decomposed earthquakes indicates that the duration of strong ground motion and the time of dominant frequency occur approximately in the same domain. Finally, it is concluded that the required calculation time reduces to about 80 % with an error less than 6 % when the main earthquake is decomposed by wavelet transform and the approximation waves are used in the nonlinear dynamic analysis.

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Seismic performance of outrigger–belt truss system considering soil–structure interaction

Cited by 43 publications

References 27 publications

An integrated topology optimization framework for three‐dimensional domains using shell elements

An integrated topology optimization framework for three‐dimensional domains using shell elements

Simultaneous size and topology optimization of 3D outrigger‐braced tall buildings with inclined belt truss using genetic algorithm

Wavelet-based Decomposition of Ground Acceleration for Efficient Calculation of Seismic Response in Elastoplastic Structures

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