In my 4 years of experience working in design offices, I have created over 500 construction plans using ETABS and SAFE software. Additionally, I possess skills in drafting plans with AutoCAD software. In the scientific field, one of the main responsibilities of structural engineers is to design and retrofit existing structures to be seismically safe. My studies focus on designing tuned mass dampers and friction-tuned mass dampers for mid-rise and high-rise structures in passive and active states with soil-structure interactions. These dampers are controlled with fuzzy controllers, with the objective function being to minimize the maximum displacement and acceleration of floors.
RESEARCH, TEACHING, or OTHER INTERESTS
Building and Construction, Civil and Structural Engineering, Mechanical Engineering, Control and Systems Engineering
Friction Tuned Mass Dampers in Seismic-Excited High-Rise Buildings with SSI Effects: A Reliability Assessment Sadegh Etedali, Morteza Akbari, Mohammad Seifi Journal of Earthquake and Tsunami, 2023 The probabilistic performance of the seismic-excited structures supplemented with passive control devices has recently received attention. Friction tuned mass damper (FTMD) devise as a novel passive control device is inspired by the idea of the combination of the friction mechanism with the traditional tuned mass damper (TMD) device. Although the application of the FTMD device has recently been considered for seismic control of structures, to the best of the authors’ knowledge, a probabilistic reliability evaluation of the high-rise building equipped with FTMD under near-field earthquakes considering soil-structure interaction (SSI) effects has not yet been addressed in the literature. In the presence of uncertainties considered for the structural model, FTMD model, foundation and soil model, and stochastic near-fault ground motion model, the reliability analyses are carried out on a benchmark 40-story building equipped with FTMD considering SSI effects to estimate the failure probabilities of both structures with and without FTMD. Three soil types, three earthquake magnitudes, three fault distances, and three seismic performance levels which include 162 reliability analyses are considered for the extension of the study. Considering different near-fault earthquake model parameters, a total average reduction of 51.13%, 49.42%, and 17.50% is given for the maximum inter-story drift ratio response of the structure equipped with FTMD than the uncontrolled ones. It is found that ignoring the uncertainties may result in an inaccurate estimation of the seismic responses of the tall buildings especially those built on soft soil near faults. The results show that the FTMD passive device is not able to satisfy the requirements of the seismic codes at the performance level of immediate occupancy, especially in high earthquake magnitudes and structures built near the fault. However, for the seismic performance levels of life safety and collapse prevention, the FTMD reduces failure probabilities of the structures for most conditions of the earthquake magnitudes and fault distances. The efficiency of the FTMD in the reduction of failure probability is often declined by increasing the softness of soils, especially for severe earthquakes closer to the fault.
A numerical study on optimal FTMD parameters considering soil-structure interaction effects Sadegh Etedali, Mohammad Seifi, Morteza Akbari Geomechanics and Engineering, 2018 The study on the performance of the nonlinear friction tuned mass dampers (FTMD) for the mitigation of the seismic responses of the structures is a topic that still inspires the efforts of researchers. The present paper aims to carry out a numerical study on the optimum tuning of TMD and FTMD parameters using a multi-objective particle swarm optimization (MOPSO) algorithm including soil-structure interaction (SSI) effects for seismic applications. Considering a 3-story structure, the performances of the optimized TMD and FTMD are compared with the uncontrolled structure for three types of soils and the fixed base state. The simulation results indicate that, unlike TMDs, optimum tuning of FTMD parameters for a large preselected mass ratio may not provide a best and optimum design. For low mass ratios, optimal selection of friction coefficient has an important key to enhance the performance of FTMDs. Consequently, a free parameter search of all FTMD parameters provides a better performance in comparison with considering a preselected mass ratio for FTMD in the optimum design stage of the FTMD. Furthermore, the SSI significant effects on the optimum design of the TMD and FTMD. The simulation results also show that the FTMD provides a better performance in reducing the maximum top floor displacement and acceleration of the building in different soil types. Moreover, the performance of the TMD and FTMD decrease with increasing soil softness, so that ignoring the SSI effects in the design process may give an incorrect and unrealistic estimation of their performance.
RECENT SCHOLAR PUBLICATIONS
An optimal nonlinear fractional order controller for passive/active base isolation building equipped with friction-tuned mass dampers M Akbari, AA Zamani, M Seifi, B Pantò, T Falborski, R Jankowski Communications in Nonlinear Science and Numerical Simulation 140, 108405 , 2025 2025 Citations: 36
Comparative analysis of seismic response reduction in multi-storey buildings equipped with base isolation and passive/active friction-tuned mass dampers M Akbari, M Seifi, T Falborski, R Jankowski Advances in Engineering Software 198, 103765 , 2024 2024 Citations: 33
A new seismic control framework of optimal PIλDµ controller series with fuzzy PD controller including soil-structure interaction S Etedali, AA Zamani, M Akbari, M Seifi Journal of the Franklin Institute 360 (14), 10536-10563 , 2023 2023 Citations: 27
Friction tuned mass dampers in seismic-excited high-rise buildings with SSI effects: A reliability assessment S Etedali, M Akbari, M Seifi Journal of Earthquake and Tsunami 17 (02), 2250022 , 2023 2023 Citations: 24
Failure probability of tall buildings with TMD in the presence of structural, seismic, and soil uncertainties S Etedali, M Seifi, M Akbari STRUCTURAL ENGINEERING AND MECHANICS 85 (3), 381-391 , 2023 2023 Citations: 15
MOCS-based optimum design of TMD and FTMD for tall buildings under near-field earthquakes including SSI effects S Etedali, M Akbari, M Seifi Soil Dynamics and Earthquake Engineering 119, 36-50 , 2019 2019 Citations: 107
A numerical study on optimal FTMD parameters considering soil-structure interaction effects S Etedali, M Seifi, M Akbari Geomechanics & engineering 16 (5), 527-538 , 2018 2018 Citations: 24
Parametric study of passive friction-tuned mass dampers for seismic structures, considering soil-structure interaction Seifi, Ghods, Etedali International Conference on Urban, Civil and Architecture Engineering. Qom … , 2016 2016
Passive friction tuned mass damper parametric study for seismic structures. Seifi, Ghods, Etedali International Conference on Civil Engineering, Tehran, Iran, 11 , 2016 2016
MOST CITED SCHOLAR PUBLICATIONS
MOCS-based optimum design of TMD and FTMD for tall buildings under near-field earthquakes including SSI effects S Etedali, M Akbari, M Seifi Soil Dynamics and Earthquake Engineering 119, 36-50 , 2019 2019 Citations: 107
An optimal nonlinear fractional order controller for passive/active base isolation building equipped with friction-tuned mass dampers M Akbari, AA Zamani, M Seifi, B Pantò, T Falborski, R Jankowski Communications in Nonlinear Science and Numerical Simulation 140, 108405 , 2025 2025 Citations: 36
Comparative analysis of seismic response reduction in multi-storey buildings equipped with base isolation and passive/active friction-tuned mass dampers M Akbari, M Seifi, T Falborski, R Jankowski Advances in Engineering Software 198, 103765 , 2024 2024 Citations: 33
A new seismic control framework of optimal PIλDµ controller series with fuzzy PD controller including soil-structure interaction S Etedali, AA Zamani, M Akbari, M Seifi Journal of the Franklin Institute 360 (14), 10536-10563 , 2023 2023 Citations: 27
Friction tuned mass dampers in seismic-excited high-rise buildings with SSI effects: A reliability assessment S Etedali, M Akbari, M Seifi Journal of Earthquake and Tsunami 17 (02), 2250022 , 2023 2023 Citations: 24
A numerical study on optimal FTMD parameters considering soil-structure interaction effects S Etedali, M Seifi, M Akbari Geomechanics & engineering 16 (5), 527-538 , 2018 2018 Citations: 24
Failure probability of tall buildings with TMD in the presence of structural, seismic, and soil uncertainties S Etedali, M Seifi, M Akbari STRUCTURAL ENGINEERING AND MECHANICS 85 (3), 381-391 , 2023 2023 Citations: 15
Parametric study of passive friction-tuned mass dampers for seismic structures, considering soil-structure interaction Seifi, Ghods, Etedali International Conference on Urban, Civil and Architecture Engineering. Qom … , 2016 2016
Passive friction tuned mass damper parametric study for seismic structures. Seifi, Ghods, Etedali International Conference on Civil Engineering, Tehran, Iran, 11 , 2016 2016
