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Roozbahan, Mostafa
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01. Izmir Institute of Technology
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Scholarly Output
5
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4
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1841/694
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0
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1
WoS Citation Count
27
Scopus Citation Count
33
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5.40
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6.60
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1
| Journal | Count |
|---|---|
| Structures | 2 |
| ASCE-ASME Journal of Risk and Uncertainty in Engineering Systems Part A-Civil Engineering | 1 |
| Meccanica | 1 |
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Article Citation - WoS: 12Citation - Scopus: 15Optimal Design of Elastic and Elastoplastic Tuned Mass Dampers Using the Mouth Brooding Fish Algorithm for Linear and Nonlinear Structures(Elsevier, 2022) Roozbahan, Mostafa; Roozbahan, Mostafa; 01. Izmir Institute of TechnologyA tuned mass damper (TMD) is a vibration control system used to reduce the structural responses to earthquakes and extreme wind loads. The performance of a TMD depends on its parameters, such as mass, damping coefficient, and stiffness. Therefore, several methods have been proposed to optimize the parameters of TMDs. This paper proposes a new method for optimizing TMDs' parameters using the Mouth Brooding Fish (MBF) algorithm based on white noise excitations. The effectiveness of TMDs optimized using the proposed method and other methods in reducing the maximum displacement of a ten-story linear structure was compared. The results indicated that the proposed method could effectively find the optimum parameters of the TMD. The efficacy of elastic and elastoplastic TMDs optimized using the proposed method in the responses of linear and nonlinear 10-story structures was also investigated. According to the results, the optimal elastic TMD more effectively reduced the maximum displacement of linear and nonlinear structures than the optimal elastoplastic TMD. Besides, elastic and elastoplastic TMDs exhibited higher efficiency in reducing the maximum displacement of the linear structure than the nonlinear structure.Article Citation - WoS: 3Citation - Scopus: 5Optimization of Tuned Mass Dampers by Considering Soil-Structure Interaction and Uncertainty in Soil Parameters(ASCE-Amer Soc Civil Engineers, 2025) Turan, Gürsoy; Turan, Guersoy; Roozbahan, Mostafa; 03.03. Department of Civil Engineering; 03. Faculty of Engineering; 01. Izmir Institute of TechnologyThe tuned mass damper (TMD) is one of the oldest and most widely used passive control devices, designed to absorb lateral energy from structures and mitigate vibrations. Various methods have been proposed for the optimal design of TMDs to minimize structural responses in buildings. However, many of these approaches overlook soil-structure interaction (SSI). Among the few studies that do account for SSI, most rely on certain soil parameter values. In reality, however, soil parameters are uncertain and can vary due to environmental factors such as soil water content. This study introduces an innovative method for optimizing TMDs by incorporating soil parameter uncertainties. The method's effectiveness is evaluated by comparing TMDs optimized using the proposed approach, TMD designed by incorporating soil parameter uncertainties (TMD-UNC) with those optimized using certain soil parameters values (TMD-CRT) and those optimized without SSI consideration (TMD-FB). A 6-story shear building model with 200 uncertain soil scenarios is used for the comparison. The results showed that, on average, TMDs optimized for uncertainty marginally outperformed TMD-CRT-Mid, which is optimized with the midpoint of soil parameter ranges. However, these TMDs outperformed TMDs optimized for stiffest and softest soil conditions in reducing responses of uncertain systems. All these TMDs proved significantly more effective at reducing structural responses than the TMD designed for a fixed-base condition.Doctoral Thesis Binalar için Ayarlı Kütle Sönümleyicilerin, Zemin–Yapı Etkileşimindeki Değişim Göz Önünde Bulundurularak Optimizasyonu(2025) Turan, Gürsoy; Roozbahan, Mostafa; Turan, Gürsoy; 03.03. Department of Civil Engineering; 03. Faculty of Engineering; 01. Izmir Institute of TechnologyAyarlı Kütle Sönümleyiciler (TMD'ler), sismik ve dinamik titreşimleri azaltarak yapısal güvenliği artıran verimli pasif cihazlardır. Ancak performansları, yapı ve zeminin dinamik özelliklerine bağlıdır. Bu tez, TMD tasarımını optimize ederek zemin-yapı etkileşimini (SSI) ve zemin değişkenliğini dikkate almaktadır. Çalışmada ilk olarak, mekanik bileşenlerinde yapılacak değişikliklerle TMD verimliliğinin artırılma olasılığı araştırılmıştır. Daha sonra, SSI'nin TMD performansı üzerindeki etkileri ayrıntılı sayısal analizler yoluyla incelenmiştir. Tez ayrıca, özellikle zemin içeriğindeki su ihtivası olmak üzere, zemin değişkenliğinin TMD'lerin performansı üzerindeki etkisini de incelemiştir. Zemin parametrelerin ve zemin parametrelerindeki değişikliklerin, sönümleyicinin optimum frekans oranı ve verimliliğinde önemli değişikliklere yol açtığı bulunmuştur. Bu etkileri ele almak için, SSI ile ilgili özelliklerdeki değişim ve belirsizlikleri hesaba katarak en etkili TMD parametrelerini belirleyen bir optimizasyon çerçevesi önerilmiştir. Önerilen yöntemlerin pratik önemini göstermek için, çeşitli zemin koşulları ve sismik aktivitesiyle bilinen İzmir bölgesinde bir vaka çalışması yürütülmüştür. Hem doğrusal hem de doğrusal olmayan betonarme bina modelleri analiz edilmiştir. Son olarak, tezde, zemin-yapı etkileşim etkilerini de göz önünde bulundurarak TMD'li ve TMD'siz çok katlı binaların dinamik ve sismik davranışlarını modellemek, analiz etmek ve görselleştirmek için geliştirilen etkileşimli, çok dilli ve eğitici bir yazılım aracı olan MoRo Analyzer tanıtılmaktadır. Bu çalışma, değişen zemin koşulları altında TMD davranışının daha derinlemesine anlaşılmasına katkıda bulunmakta ve bina yapılarında daha verimli titreşim kontrol sistemleri tasarlamak için pratik rehberlik sağlamaktadır.Article Citation - WoS: 11Citation - Scopus: 12An Improved Passive Tuned Mass Damper Assisted by Dual Stiffness(Elsevier, 2023) Roozbahan, Mostafa; Roozbahan, Mostafa; Turan, Gürsoy; Turan, Gürsoy; 01. Izmir Institute of Technology; 03.03. Department of Civil Engineering; 03. Faculty of EngineeringA tuned mass damper (TMD) is one of the oldest and most commonly used passive control devices attached to structures to absorb lateral loads of energy from main systems. In the last decades, several novel tuned mass dampers have been designed to increase the performance of TMDs in decreasing the structural responses during excitation vibrations. Moreover, several formulations and numerical optimization methods have been developed to optimize the TMDs parameters. This paper proposes a novel passive tuned mass damper with dual stiffness (DSTMD). The DSTMD includes mass, primary and secondary springs, dashpot, and motion limiting chamber. The performance of DSTMDs depends on their properties such as mass, primary and secondary stiffness, damping coefficient, and the length of the motion limiting chamber. Thus, a metaheuristic optimization algorithm, called the Mouth Brooding Fish algorithm, was used to optimize the DSTMDs parameters. The effectiveness of the optimum DSTMD on two different linear ten-story structures under several earthquakes has been studied and compared with the effectiveness of classical optimum TMDs. According to the study, optimum DSTMDs generally show better effects for certain excitations, and as an average performance, they are superior compared to the classical optimum TMDs in reducing maximum displacement of the buildings. At last, structural yielding is considered, and the performance analysis on this structure shows that the DSTMD has a superior effect in reducing the maximum displacement and is among the best methods for the calculated absolute yielding amount.Article Citation - WoS: 1Citation - Scopus: 1Efficiency Evaluation of Optimal Tlcd and Tmd for the Seismic Response Reduction of Buildings Considering Soil-Structure Interaction Effect(Springer, 2025) Roozbahan, Mostafa; Masnata, Chiara; Turan, Guersoy; Pirrotta, Antonina; 01. Izmir Institute of TechnologyTuned Mass Dampers (TMDs) and Tuned Liquid Column Dampers (TLCDs) are widely recognized passive vibration control devices used to reduce structural vibrations. While TMDs have been extensively studied for mitigating the seismic responses of multi-story buildings considering Soil-Structure Interaction (SSI), the efficiency of TLCDs in these conditions remains largely unexplored. Furthermore, a direct comparison of these devices under similar conditions has not been conducted. Then, to address these gaps, this study investigates the efficiency of TLCDs and compares them to TMDs in reducing seismic-induced vibrations, focusing on the influence of SSI. The control performance of both devices depends on various parameters, primarily the frequency and damping ratios. Therefore, the Mouth Brooding Fish (MBF) metaheuristic algorithm is applied to optimize these parameters, accounting for SSI effects. To evaluate the different efficiency between TMDs and TLCDs under SSI conditions, three types of shear buildings are considered: an eight-story, a sixteen-story and a forty-story structure. The seismic responses of the uncontrolled, TMD-controlled, and TLCD-controlled buildings are examined under twenty-two far-field and fourteen near-field earthquakes, considering both fixed-base and flexible-base scenarios. Results indicate that while both devices significantly reduce seismic responses, TMDs generally outperform TLCDs, particularly in taller buildings where the impact of SSI is more significant. Further, this study highlights that neglecting SSI in the design of these devices may lead to an overestimation of their effectiveness, especially in softer soils, emphasizing the importance of considering SSI in the optimization process for accurate and reliable outcomes.