All Outputs (41)

Development of analytical model for bonding of CFRP rod in concrete subjected to cyclic loads (2024)
Journal Article
Azarkerdar, A., & Hejazi, F. (2024). Development of analytical model for bonding of CFRP rod in concrete subjected to cyclic loads. Applied Sciences, 14(3), Article 1134. https://doi.org/10.3390/app14031134

Recent material science advances have resulted in the use of High-Performance Concrete (HPC) and Ultra-High-Performance Concrete (UHPC) in superstructures, which were chosen for their superior strength. However, under cyclic loads, these materials fr... Read More about Development of analytical model for bonding of CFRP rod in concrete subjected to cyclic loads.

Seismic performance of structure equipped with a new rubber bracing damper system (2024)
Journal Article
Hejazi, F., Farahpour, H., & Ayyash, N. (2024). Seismic performance of structure equipped with a new rubber bracing damper system. Archives of Civil and Mechanical Engineering, 24(1), Article 46. https://doi.org/10.1007/s43452-023-00845-x

Nowadays, vibration energy absorption devices are widely implemented in many buildings subjected to severe vibration due to natural hazards, such as earthquakes, strong winds, and typhoons. Recently, viscous dampers have been commonly used in many st... Read More about Seismic performance of structure equipped with a new rubber bracing damper system.

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 adjustable variable stiffness restrainer for bridge subjected to seismic excitation (2023)
Journal Article
Hamzah, M. K., & Hejazi, F. (2023). Development of adjustable variable stiffness restrainer for bridge subjected to seismic excitation. PLoS ONE, 18(6), Article e0286977. https://doi.org/10.1371/journal.pone.0286977

This paper presents a numerical and experimental assessment of a developed adjustable variable stiffness restrainer (AVSR) utilized for short span bridges. This restrainer has the ability to demonstrate multi stiffness capacity in different stages of... Read More about Development of adjustable variable stiffness restrainer for bridge subjected to seismic 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.

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.

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.

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.

Developed steady-state response for a new hybrid damper mounted on structures (2023)
Journal Article
Ziaee, M., & Hejazi, F. (2023). Developed steady-state response for a new hybrid damper mounted on structures. PLoS ONE, 18(8), Article e0290248. https://doi.org/10.1371/journal.pone.0290248

Coulomb friction is considered as a mechanical approach to diminish the structural responses during the excitations. However, in case of severe oscillations supplementary mechanisms are employed besides the friction to mitigate the destructive effect... Read More about Developed steady-state response for a new hybrid damper mounted on structures.

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.