Seyed Mehdi Zahrai
University of Tehran
Braced frameGeologyEngineeringDissipationFinite element methodDamperNonlinear systemBeam (structure)Geotechnical engineeringMaterials scienceVibrationBracingStiffnessBraceSeismic retrofitComputer scienceDuctilityControl theoryStructural engineeringBuckling
143Publications
15H-index
711Citations
Publications 130
Newest
#1Mohsen Zare Golmoghany (UT: University of Tehran)
#2Seyed Mehdi Zahrai (UT: University of Tehran)H-Index: 15
Abstract In this paper to improve the seismic behavior of structures and decrease structural earthquake damages, a new hybrid control system is proposed consisting of Friction Damper and Vertical Shear Panel (HFD-VSP) in series. The new system benefits of two-level energy dissipation such that in moderate earthquakes friction damper (FD) as the first fuse operates while in strong earthquake both FD and Vertical Shear Panel (VSP) dissipate energy. FD can eliminate the shortcoming of VSP in terms ...
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#1Saeed Panahi (Bu-Ali Sina University)
#2Seyed Mehdi Zahrai (UT: University of Tehran)H-Index: 15
Abstract Many engineers are interested in the progressive collapse phenomenon, considering multi-user typical buildings, construction bias toward economization and thus, reduction of material consumption. The key factor in progressive collapse is the disproportion between the initial and final damage which sometimes can lead to the destruction of the whole building. So, the efforts are focused to prevent the expansion of initial damage through some strategies such as strengthening some load-bear...
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#1Samira Ebrahimi (UT: University of Tehran)H-Index: 3
#2Seyed Rasoul Mirghaderi (UT: University of Tehran)H-Index: 11
Last. Seyed Mojtaba Seyedzadeh Otaghsaraie (Islamic Azad University Central Tehran Branch)
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Abstract In Hollow Structural Section (HSS) column, webs are available at both ends of column flanges. Thus, there is an offset between webs and a gusset plate connected to the middle of this column flange. However, in H-shaped column, both the column web and the gusset plate are connected to the middle of the column flange. On the other hand, unlike H-shaped column, HSS column flange does not possess an appropriate support and this problem can induce distortion, out-of-plane deformation, and fr...
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#1Seyed Amin Mousavi (UT: University of Tehran)H-Index: 8
#2Seyed Mehdi Zahrai (UT: University of Tehran)H-Index: 15
Last. Ali Akhlagh Pasand (UT: University of Tehran)
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Abstract In this paper, a drift-based seismic design (Dr.BSD) procedure is proposed by which a multi-story frame can be proportioned for a predetermined maximum inter-story drift uniformly distributed along all stories. While conceptually the proposed step-by-step design procedure is applicable for any lateral load resisting system, this study mainly focuses on Buckling-Restrained Braced Frames (BRBFs). Dr.BSD has a coupled theoretical-empirical basis developed for medium to high-rise multistory...
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#1Mohammadreza Khoshkalam (IUST: Iran University of Science and Technology)H-Index: 1
#2Mohamad Hosein Mortezagholi (UT: University of Tehran)H-Index: 2
Last. Seyed Mehdi Zahrai (UT: University of Tehran)H-Index: 15
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A variety of yielding dampers have been proposed with different materials and configurations and constructed for various structures to improve their seismic performance. ADAS dampers are considered...
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To improve seismic behavior of structures, a two-level control system is proposed in this paper where by combining two vertical shear panels in series in a chevron bracing configuration, Double-Vertical Shear Panel, D-VSP is introduced. Utilizing two-levels of energy absorption for two different earthquake intensity levels, D-VSP is expected to beneficially change dynamic behavior parameters like strength, stiffness and damping ratio through increasing ductility. To validate research, a VSP is m...
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#1Ahmad Modhej (IAU: Islamic Azad University)H-Index: 1
#2Seyed Mehdi Zahrai (UT: University of Tehran)H-Index: 15
Abstract Structural control prevents structural damage and provides the desirable performance level through the ductility of components and using passive energy dissipation systems. In this paper, the performance of a recently introduced passive control device called Visco-Hyperelastic Damper (VHD) is investigated by ABAQUS FEM software. This device has the properties of both velocity-dependent and displacement-dependent dampers and provides additional energy dissipation for structures. This dev...
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Recently a new type of Reduced Beam Section (RBS) connection called “Tubular Web RBS (TW-RBS)” has been numerically and experimentally studied. TW-RBS connections are made by replacing a part of web with a tube or pipe at the desirable location of the beam plastic hinge. This paper aims to numerically investigate the effect of key factors such as position, diameter, and thickness of the tube on the hysteretic behavior of the connection under cyclic load using ABAQUS finite element software. Firs...
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#1Masoud Ami (IAU: Islamic Azad University)
#2Seyed Mehdi Zahrai (UT: University of Tehran)H-Index: 15
Abstract In Concrete-Filled Tubular (CFT) columns under the influence of compressive loading, an omnilateral confinement pressure is exerted upon the concrete core which leads to increase in the strength, stiffness, and ductility of the column. This paper investigates the influence of bolted shear connectors on the behavior of circular and square CFT columns. Also, a comparison is made between the interactional axial load-bending moment (P–M) curves obtained from the numerical analyses and the P...
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#1Ali Parvari (Islamic Azad University, Arak)H-Index: 1
#2Seyed Mehdi Zahrai (UT: University of Tehran)H-Index: 15
Last. Ehsanollah Zeighami (Islamic Azad University, Arak)H-Index: 2
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Abstract Numerous studies conducted on different types of rigid connections such as reduced beam section (RBS) and drilled flange (DF) showed their ductile behavior. This paper evaluates the seismic performance of moment resisting connections with drilled flange (DF) beams as a simple and efficient alternative for RBS connected to concrete-filled steel tube CFT columns. Different patterns are proposed and the shear capacity of panel zone and ductility of connection are assessed to obtain the opt...
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