All Outputs (29)

Buckling-restrained bracing system with ultra-high-performance fiber concrete (2023)
Journal Article
Ostovar, N., & Hejazi, F. (2023). Buckling-restrained bracing system with ultra-high-performance fiber concrete. Applied Sciences, 13(14), Article 8250. https://doi.org/10.3390/app13148250

Recently, buckling-restrained braces (BRBs) have been widely implemented as seismic load resistance systems in buildings to enhance their response against dynamic vibration. However, during catastrophic earthquakes, the steel core in BRB devices full... Read More about Buckling-restrained bracing system with ultra-high-performance fiber concrete.

Fuzzy logic based adaptive vibration control system for structures subjected to seismic and wind loads (2023)
Journal Article
Abdulateef, W. S., & Hejazi, F. (2023). Fuzzy logic based adaptive vibration control system for structures subjected to seismic and wind loads. Structures, 55, 1507-1531. https://doi.org/10.1016/j.istruc.2023.06.108

In this study, an attempt has been made to develop a Fuzzy Logic Multi Verse Optimal Control (FLMVOC) system as a new adaptive real-time vibration control mechanism for structures subjected to seismic excitation and wind load by utilizing the capabil... Read More about Fuzzy logic based adaptive vibration control system for structures subjected to seismic and wind loads.

Development of hybrid rubber damper-restrainer (HRDR) system for structures under sever dynamic excitation (2023)
Journal Article
Mandani, A. M., Hejazi, F., & Nikkhoo, A. (2023). Development of hybrid rubber damper-restrainer (HRDR) system for structures under sever dynamic excitation. Structures, 55, 1354-1387. https://doi.org/10.1016/j.istruc.2023.06.106

Nowadays, high damping rubber materials are extensively implementing in various types of structure to mitigate harmful effect of imposed vibration and dynamic force to the structure. Although, the rubbers exhibit noticeable damping in the shear actio... Read More about Development of hybrid rubber damper-restrainer (HRDR) system for structures under sever dynamic excitation.

Development of ultra high-performance fiber reinforced concrete barge for 5 MW wind turbine (2023)
Journal Article
Lazarus Dachollom, G., Hejazi, F., & Yusuf, B. (2023). Development of ultra high-performance fiber reinforced concrete barge for 5 MW wind turbine. Structures, 53, 1349-1368. https://doi.org/10.1016/j.istruc.2023.04.113

Floating wind turbines are gaining more popularity today as one of the effective green energy harvesting systems. In the effort to reduce the cost of construction for floating wind turbines, concrete support structures and concrete barge have been de... Read More about Development of ultra high-performance fiber reinforced concrete barge for 5 MW wind turbine.

Development of integrated semi-active adaptive vibration control system for bridges subjected to traffic loads (2023)
Journal Article
Farahpour, H., & Hejazi, F. (2023). Development of integrated semi-active adaptive vibration control system for bridges subjected to traffic loads. Structures, 51, 1773-1794. https://doi.org/10.1016/j.istruc.2023.03.107

Nowadays, the fluid viscous damper is the most conventional energy dissipation system implemented in bridge structures to control the vibrations due to traffic loads. However, to effectively protect the bridge against frequent and severer vibrations,... Read More about Development of integrated semi-active adaptive vibration control system for bridges subjected to traffic loads.

Strengthening of reinforced concrete slabs using macro and micro synthetic fibers (2023)
Journal Article
S. Zainal, S. M., Hejazi, F., & Mafaileh, A. M. (2023). Strengthening of reinforced concrete slabs using macro and micro synthetic fibers. Structures, 51, 1579-1590. https://doi.org/10.1016/j.istruc.2023.03.120

Concrete is brittle and prone to cracking, especially under tensile forces. The gradual development and propagation of cracks would subsequently lead to brittle failure. The use of fibers is effective in restricting the propagation of cracks and impr... Read More about Strengthening of reinforced concrete slabs using macro and micro synthetic fibers.

Health monitoring of ultra high fiber performance reinforced concrete communication tower using machine learning algorithms (2023)
Journal Article
Saleem, S., Hejazi, F., & Ostovar, N. (2023). Health monitoring of ultra high fiber performance reinforced concrete communication tower using machine learning algorithms. Journal of Civil Structural Health Monitoring, 13(4-5), 1105-1130. https://doi.org/10.1007/s13349-023-00688-3

Within the last decades, the needed for communication towers has accelerated with the requirements for effective communication, especially for radio, radar, and television. The complexity configuration of the tower and limit access to the structure b... Read More about Health monitoring of ultra high fiber performance reinforced concrete communication tower using machine learning algorithms.

Development of hybrid performance-based optimization algorithm for structures equipped with vibration damper devices (2023)
Journal Article
Ayyash, A. N. A., & Hejazi, F. (2023). Development of hybrid performance-based optimization algorithm for structures equipped with vibration damper devices. Archives of Civil and Mechanical Engineering, 23(2), Article 123. https://doi.org/10.1007/s43452-023-00665-z

Nowadays, various types of vibration damping systems are being implemented in different buildings to diminish seismic effects on structures. However, engineers are faced with the challenging task of developing an optimum design for structures utilizi... Read More about Development of hybrid performance-based optimization algorithm for structures equipped with vibration damper devices.

Optimization of the multi-level spring restrainer for bridges by hybrid particle swarm and gravitational search algorithm (2023)
Journal Article
Hamzah, M. K., Hejazi, F., & Ayyash, N. (2023). Optimization of the multi-level spring restrainer for bridges by hybrid particle swarm and gravitational search algorithm. International Journal of Steel Structures, 23, 901–913. https://doi.org/10.1007/s13296-023-00734-2

This paper proposes a new multi-level spring restrainer (MLSR) that exhibits multi stiffness performance in different levels of movement of bridge superstructure to prevent unseating during applied dynamic loads. The analytical model of the proposed... Read More about Optimization of the multi-level spring restrainer for bridges by hybrid particle swarm and gravitational search algorithm.

Development of rectangular vibration isolators with double core systems for structures (2023)
Journal Article
Altalabani, D., & Hejazi, F. (2023). Development of rectangular vibration isolators with double core systems for structures. International Journal of Civil Engineering, 21, 763–787. https://doi.org/10.1007/s40999-022-00801-5

One of the best techniques for isolating structures from the ground is the seismic isolation technique. Nowadays, square and circular base isolators are the most frequently employed shapes. Nevertheless, these configurations are not applicable for th... Read More about Development of rectangular vibration isolators with double core systems for structures.

Improving the performance of lightweight crumb rubber mortar using synthetic, natural, and hybrid fiber reinforcements (2023)
Journal Article
Zainal, S. M. S., Mattius, D., Baba, Z., Rizalman, A. N., & Hejazi, F. (2023). Improving the performance of lightweight crumb rubber mortar using synthetic, natural, and hybrid fiber reinforcements. Fibers, 11(1), 9. https://doi.org/10.3390/fib11010009

The global market for tires is ever-growing, and partially replacing sand with crumb rubber (CR) as fine aggregates in concrete could reduce environmental pollution. However, the main barrier to the complete usage of recycled tire crumbs in construct... Read More about Improving the performance of lightweight crumb rubber mortar using synthetic, natural, and hybrid fiber reinforcements.

Development of non-sticking steady-state solution for structures with hybrid damping mechanism (2023)
Journal Article
Ziaee, M., & Hejazi, F. (2023). Development of non-sticking steady-state solution for structures with hybrid damping mechanism. Structures, 47, 233-245. https://doi.org/10.1016/j.istruc.2022.10.118

Energy dissipation occurs through Coulomb friction and is considered a conventional type of mechanical damping mechanism in structures subjected to external loads. Structures that are subjected to severe dynamic excitations such as ground motion or w... Read More about Development of non-sticking steady-state solution for structures with hybrid damping mechanism.

Development of adjustable fluid damper device for the bridges subjected to traffic loads (2022)
Journal Article
Farahpour, H., & Hejazi, F. (2023). Development of adjustable fluid damper device for the bridges subjected to traffic loads. Structures, 47, 1295-1322. https://doi.org/10.1016/j.istruc.2022.11.136

In this research, an Adjustable Bypass Fluid Damper (ABFD) is developed by utilizing a pair of external fluid flow pipes and flow control valves. The flow control valves control the flow pressure of the fluid passing through bypass pipes and adjusted... Read More about Development of adjustable fluid damper device for the bridges subjected to traffic loads.

Hybrid rubber-concrete isolation slab system with various shape factors for structures subjected to horizontal and vertical vibrations (2022)
Journal Article
Fayyadh, N. K., & Hejazi, F. (2023). Hybrid rubber-concrete isolation slab system with various shape factors for structures subjected to horizontal and vertical vibrations. The Structural Design of Tall and Special Buildings, 32(4), Article e1995. https://doi.org/10.1002/tal.1995

The present framework proposed the development of a Hybrid Rubber-Concrete Isolation Slab System (HRCISS) to support building structures subjected to horizontal and vertical vibration due to ground motion and machine or equipment operation in the str... Read More about Hybrid rubber-concrete isolation slab system with various shape factors for structures subjected to horizontal and vertical vibrations.

Reinforced concrete beams externally strengthened by CFRP rods with steel plate, anchorage bolts, and concrete jacketing (2022)
Journal Article
Alkhateeb, M. Y., & Hejazi, F. (2022). Reinforced concrete beams externally strengthened by CFRP rods with steel plate, anchorage bolts, and concrete jacketing. Structures, 46, 1994-2013. https://doi.org/10.1016/j.istruc.2022.11.024

This study proposed a new scheme for the retrofitting of Reinforced Concrete (RC) beams using Carbon Fiber Reinforced (CFRP) rods restrained using steel plates and anchorage bolts called the mechanical anchorage system (MAS). This system also employe... Read More about Reinforced concrete beams externally strengthened by CFRP rods with steel plate, anchorage bolts, and concrete jacketing.

A low computational cost seismic analyses framework for 3D tunnel-form building structures (2022)
Journal Article
Mohsenian, V., Nikkhoo, A., Hajirasouliha, I., & Hejazi, F. (2022). A low computational cost seismic analyses framework for 3D tunnel-form building structures. Advances in Structural Engineering, 25(14), 2938-2952. https://doi.org/10.1177/13694332221113040

Numerical modeling of tunnel-form buildings entails the utilization of 3D finite element models consisting of large numbers of shell and fiber elements. Accordingly, the non-linear analysis of such models under seismic excitations is both time-consum... Read More about A low computational cost seismic analyses framework for 3D tunnel-form building structures.

Fracture mechanics modeling of reinforced concrete joints strengthened by CFRP sheets (2022)
Journal Article
Hejazi, F., Karim, H., Kazemi, H., Shahbazpanahi, S., & Mosavi, A. (2022). Fracture mechanics modeling of reinforced concrete joints strengthened by CFRP sheets. Case Studies in Construction Materials, 17, e01273. https://doi.org/10.1016/j.cscm.2022.e01273

Nowadays, fracture mechanics modeling for strengthening structural members is a challenging issue for structural engineers. The developed fracture mechanics modeling was applicable for identifying propagation of a crack in concrete structural members... Read More about Fracture mechanics modeling of reinforced concrete joints strengthened by CFRP sheets.

Rubber bearing isolator with granular and polymer filler core and application on a building (2022)
Journal Article
Tan, K. C., & Hejazi, F. (2022). Rubber bearing isolator with granular and polymer filler core and application on a building. Structures, 42, 309-332. https://doi.org/10.1016/j.istruc.2022.06.006

In the present study, a new core-and-filler system was proposed to use in elastomer bearings as a substitution to hazardous lead core while improving the performance of base isolators. The proposed system utilizes steel core and filler consists of ei... Read More about Rubber bearing isolator with granular and polymer filler core and application on a building.

Development of hybrid optimization algorithm for structures furnished with seismic damper devices using the particle swarm optimization method and gravitational search algorithm (2022)
Journal Article
Ayyash, N., & Hejazi, F. (2022). Development of hybrid optimization algorithm for structures furnished with seismic damper devices using the particle swarm optimization method and gravitational search algorithm. Earthquake Engineering and Engineering Vibration, 21(2), 455-474. https://doi.org/10.1007/s11803-022-2088-1

Previous studies about optimizing earthquake structural energy dissipation systems indicated that most existing techniques employ merely one or a few parameters as design variables in the optimization process, and thereby are only applicable only to... Read More about Development of hybrid optimization algorithm for structures furnished with seismic damper devices using the particle swarm optimization method and gravitational search algorithm.

Development of floating rubber-concrete isolation slab system for 3D vibrations (2022)
Journal Article
Fayyadh, N. K., Hejazi, F., & Chong, T. (2022). Development of floating rubber-concrete isolation slab system for 3D vibrations. Journal of Building Engineering, 51, 104246. https://doi.org/10.1016/j.jobe.2022.104246

Nowadays by implementing of various machineries and equipment, the structures are subjected to multidirectional vibrations as combination of vertical and horizontal cyclic oscillations. The slabs are the main structural components, imposed to the dyn... Read More about Development of floating rubber-concrete isolation slab system for 3D vibrations.