Article
Construction & Building Technology
Hai -Bin Huang, Wei Zhang, Zhi-Guo Sun, Dong-Sheng Wang
Summary: This study aims to develop probabilistic models for predicting the bond strength of fiber-reinforced polymer (FRP) to concrete joints and quantify the associated uncertainties. By collecting an experimental database and calibrating two deterministic bond strength models, the predictive models are determined and their accuracy and reliability are verified through experiments.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Construction & Building Technology
Amirreza Moghaddas, Davood Mostofinejad, Alireza Saljoughian, Elaheh Ilia
Summary: This study introduced an empirical bond-slip model for FRP composites attached to concrete surfaces via EBROG technique, analyzed the retrofitting effects of EBR and EBROG methods, and validated the model through single lap-shear experiments.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Mechanics
Shakiba Zolfaghari, Davood Mostofinejad, Nicholas Fantuzzi, Raimondo Luciano, Francesco Fabbrocino
Summary: In this study, the effect of groove width and depth variation on the FRP-concrete bond performance was investigated. The results showed that the grooving method increased the bond strength compared to the externally-bonded reinforcement method. The optimal groove dimensions for retrofitting were determined to be 10 x 5 mm (width x depth) with a 73.5% increase in load-carrying capacity compared to the EBR specimens.
COMPOSITE STRUCTURES
(2023)
Article
Construction & Building Technology
R. Mourao, A. Cacoilo, F. Teixeira-Dias, D. Lecompte, T. Stratford
Summary: This study investigates the influence of externally bonded fiber reinforced polymers (FRP) on the spalling phenomena of concrete subjected to contact explosions through detailed experimental and numerical methodologies. The results show that the mass of bonded material and increased bonded areas lead to enlarged surface damage, while the compressive strength of concrete plays a major role in spall damage.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Polymer Science
Muhammad Nasir Amin, Mudassir Iqbal, Arshad Jamal, Shahid Ullah, Kaffayatullah Khan, Abdullah M. Abu-Arab, Qasem M. S. Al-Ahmad, Sikandar Khan
Summary: This study investigated the non-linear capability of artificial intelligence (AI)-based gene expression programming (GEP) modelling to develop a mathematical relationship for estimating the interfacial bond strength (IBS) of FRP laminates on a concrete prism with grooves. The developed model reflected close agreement between experimental and predicted results, indicating that the developed mathematical equation was reliable in estimating IBS based on the available properties of FRPs. The sensitivity and parametric analysis showed that the axial stiffness and width of FRP are the most influential parameters in contributing to IBS.
Article
Engineering, Civil
Zhuolin Wang, Mingqian Wang, Qingfeng Xu, Kent A. Harries, Xiangmin Li, Rundong Gao
Summary: This study investigates the strengthening of prestressed concrete hollow-core slabs with externally-bonded laminated bamboo plates. The low stiffness of laminated bamboo helps to prevent debonding and enhance the strength of the slabs. A threshold value for the ratio of steel reinforcing and bamboo laminates is determined, providing guidance for the design of externally-bonded laminated bamboo-strengthened hollow-core slabs. Analysis shows that the behavior of the strengthened slabs can be easily and accurately predicted.
ENGINEERING STRUCTURES
(2021)
Article
Polymer Science
Kaffayatullah Khan, Mudassir Iqbal, Rahul Biswas, Muhammad Nasir Amin, Sajid Ali, Jitendra Gudainiyan, Anas Abdulalim Alabdullah, Abdullah Mohammad Abu Arab
Summary: This study presents a comparative analysis of hybrid models that combine support vector machines (SVMs) with meta-heuristic optimization algorithms (MOAs) to predict the ultimate interfacial bond strength (IBS) capacity of fiber-reinforced polymer (FRP). The developed hybrid SVM models showed high accuracy, with R-2 values ranging from 0.8870 to 0.9774 in the training phase and from 0.8270 to 0.9294 in the testing phase. The SVM-HHO model, which combines SVM with the Harris hawks optimization algorithm, was found to be the most accurate in both training and testing phases. The results suggest that the developed hybrid SVM model can be used as an alternative tool for estimating the ultimate IBS capacity of FRP concrete in civil engineering projects.
Article
Construction & Building Technology
Fatemeh Mohammadi Ghahsareh, Davood Mostofinejad, Sepehr Batebi
Summary: This study investigated the effects of different groove classes on the effective bond length of CFRP sheets and the bond behavior between CFRP and concrete in EBROG joints. The results showed a significant increase in effective bond length in the tested EBROG joints compared to the EBR joints. The bond strength in longitudinal and transverse groove directions was similar but followed different bond mechanisms.
ACI STRUCTURAL JOURNAL
(2022)
Article
Construction & Building Technology
Yaosheng Zhang, Lianguang Wang, Haiyang Gao
Summary: This paper investigated the influences of temperature elevation and repeated environmental effects on the bond behavior of notched concrete beams externally bonded with CFRP through four-point bending tests. Two failure modes were observed, with ultimate loads decreasing linearly with increasing temperature and cyclic number, and slopes of load-displacement curves also being reduced. Average interfacial shear stresses decreased linearly before CFRP debonding. Average shear traction stresses and interface stiffnesses also decreased with temperature and cyclic number.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Construction & Building Technology
Yaosheng Zhang, Lianguang Wang, Haiyang Gao
Summary: This study investigated the influence of temperature elevation and repeated environmental effects on the bond behavior of notched concrete beams externally bonded with CFRP through four-point bending tests. The experimental results showed two failure modes and decreasing ultimate loads with increasing temperature and cyclic number.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Chemistry, Physical
Paolo Foraboschi
Summary: This paper discusses the changing of load distribution from distributed to concentrated in reinforced concrete beams and presents a design method to enhance the shear capacity of the beam. The method involves the application of fiber composites bonded to the beam's stirrups at a 45-degree angle. The paper also provides an analytical model to predict the concentrated load-carrying capacity of the strengthened beam.
Article
Mechanics
Eva Oller, Renata Kotynia, Antonio Mari
Summary: The contribution of externally bonded FRP sheets to the shear strength of RC elements strengthened in shear is influenced by factors such as section shape, internal transverse reinforcement, and FRP configurations. Predictions tend to be more conservative for beams without transverse reinforcement and unsafe in some cases for beams with it, indicating a possible interaction with internal transverse reinforcement not considered in experimental FRP contributions. Wrapped FRP configurations often assume failure at the bottom corner of the section, leading to conservative results, while U-shaped and side-bonded configurations show more accuracy depending on the assumed bond model. Some models may have unsafe predictions for continuous FRP systems applied in beams with transverse reinforcement.
COMPOSITE STRUCTURES
(2021)
Article
Engineering, Civil
Rami A. Hawileh, Haya H. Mhanna, Ahmad Al Rashed, Jamal A. Abdalla, M. Z. Naser
Summary: The experimental study demonstrated that RC beams strengthened with PET-FRP showed significant strength enhancement and higher ductility compared to beams strengthened with conventional CFRP and unstrengthened beams. PET-FRP is a promising strengthening material that improves structural performance and provides a sustainable alternative to traditional FRP strengthening systems.
ENGINEERING STRUCTURES
(2022)
Article
Mechanics
F. Cannizzaro, B. Panto, S. Caddemi, I Calio
Summary: This paper presents a new macro-element model for simulating the interaction between masonry structures and Externally Bonded Composite (EBC) layers. The proposed model can provide a reliable simulation of EBC layer applications while maintaining a low computational burden. Experimental and numerical tests are used to validate the new macro-modelling approach.
COMPOSITE STRUCTURES
(2023)
Article
Engineering, Civil
Comfort Mensah, Benzhi Min, Zhenqing Wang, Alex Osei Bonsu
Summary: This study investigated the influence of steel fiber content on the bond performance between CFRP laminates and concrete substrate. The results showed a significant improvement in maximum shear stress under steel fiber contents ranging from 0.25% to 1.5%.
Article
Construction & Building Technology
Mohsen Amoushahi Khouzani, Mehran Zeynalian, Mahmoud Hashemi, Davood Mostofinejad, Farhang Farahbod
STRUCTURAL CONCRETE
(2020)
Article
Construction & Building Technology
Nasrin Karimi, Davood Mostofinejad
CONSTRUCTION AND BUILDING MATERIALS
(2020)
Article
Construction & Building Technology
Hadi Bahmani, Davood Mostofinejad, Sayyed Ali Dadvar
JOURNAL OF MATERIALS IN CIVIL ENGINEERING
(2020)
Article
Engineering, Civil
Davood Mostofinejad, Mohammad Sadegh Salimian, Maryam Taherirani, Masood Noroozolyaee
Summary: The study found that the grooving method effectively enhanced the performance and load-bearing capacity of the columns. For different eccentricity ratios, columns strengthened with the EBROG method showed a significant increase in load-carrying capacity.
JOURNAL OF COMPOSITES FOR CONSTRUCTION
(2021)
Article
Construction & Building Technology
Nafise Hosseini Balam, Bahareh Tayebani, Davood Mostofinejad
Summary: This study explores the use of bacteria to enhance the durability of concrete, with seawater serving as a beneficial curing environment. Results show that bacterially-treated concrete exhibits improved performance in seawater, including reduced water absorption and increased compressive strength.
JOURNAL OF MATERIALS IN CIVIL ENGINEERING
(2021)
Article
Construction & Building Technology
Saadat Eshaghi-Milasi, Davood Mostofinejad, Alireza Saljoughian, Hadi Bahmani
Summary: This study investigates the behavior of reinforced concrete columns retrofitted with ultra-high-performance fiber-reinforced concrete (UHPFRC) jackets and fiber-reinforced polymer (FRP) wraps under different loading conditions. The results show that the load-carrying capacity and ductility of the columns improve significantly after retrofitting, particularly for higher eccentricities.
STRUCTURAL CONCRETE
(2022)
Article
Engineering, Civil
Davood Mostofinejad, Iman Moosaie, Mohamadreza Eftekhar, Ebrahim Hesami
Summary: Ultra-high performance concrete (UHPC), a new generation of cementitious composite material with notable mechanical characteristics, has the potential to be widely used. This research investigates the compressive strength and flexural behavior of UHPC composites with different mixture designs and curing conditions. The results show that a stepwise method can significantly increase the compressive strength, and the hybridization of polyvinyl alcohol (PVA) and modified polypropylene (PP) fibers can greatly enhance the flexural strength, toughness, and energy absorption capacity of UHPC. The strain-hardening properties of the hybrid fiber-reinforced UHPC are more pronounced compared to engineered cementitious composites (ECC).
IRANIAN JOURNAL OF SCIENCE AND TECHNOLOGY-TRANSACTIONS OF CIVIL ENGINEERING
(2022)
Article
Construction & Building Technology
Ali Soleimani Borujerdi, Davood Mostofinejad, Hyeon-Jong Hwang, Mohammad Sadegh Salimian
Summary: This study investigated the seismic behavior of RC exterior beam-column joints with insufficient joint hoops and using high-strength materials, and found that the use of high-strength bars increased bond-slip and decreased energy dissipation capacity.
JOURNAL OF BUILDING ENGINEERING
(2021)
Review
Mechanics
Khaled Sanginabadi, Azad Yazdani, Davood Mostofinejad, Christoph Czaderski
Summary: This study reviewed and compared the influential parameters and the bond behavior between fiber reinforcement polymer (FRP) composites and concrete substrate using the externally bond reinforcement on grooves (EBROG) method. The results showed that the EBROG method considerably improved the bond behavior and a combination of FRP rupture and debonding was observed at the FRP-adhesive interface over the grooves.
COMPOSITE STRUCTURES
(2022)
Article
Engineering, Civil
Hadi Bahmani, Davood Mostofinejad, Sayyed Ali Dadvar
Summary: This study investigated the mechanical properties and microstructure of ultra-high-performance fiber-reinforced concrete (UHPFRC) specimens containing natural zeolite as a partial replacement for cement. The results showed that the UHPFRC mixtures containing natural zeolite exhibited enhanced compressive strength. The use of barchip fibers and zeolite as a pozzolanic material improved the mechanical properties and microstructure of the UHPFRC specimens.
IRANIAN JOURNAL OF SCIENCE AND TECHNOLOGY-TRANSACTIONS OF CIVIL ENGINEERING
(2022)
Article
Construction & Building Technology
Mohammadreza Hajiaghamemar, Davood Mostofinejad, Hadi Bahmani
Summary: This paper investigates the performance of high-strength concrete (HSC) with steel slag as a replacement for natural aggregates under high temperatures. The results show that HSC made with steel slag and reinforced with steel fibers and calcium aluminate cement has higher compressive and flexural strengths at high temperatures.
STRUCTURAL CONCRETE
(2023)
Article
Engineering, Civil
Abdallah Azizi, Majid Barghian
Summary: To protect structures from earthquakes, a system called base isolation is used to reduce the force applied to the structure during ground movement. In this research, a new shape of isolator called multi-layer pendulum isolator is proposed. The equations of the isolator were derived and solved using MATLAB software. The results showed that the proposed isolator effectively reduced acceleration, drift, and base shear, making it an efficient system for reducing the destructive effects of an earthquake.
Article
Engineering, Civil
Abdallah Azizi, Majid Barghian
Summary: This study aims to improve the performance of an isolator system by changing the gravity effect through adding a spring under a pendulum column. The research found that changing the gravity effect can effectively alter the system's response by reducing its stiffness.
EARTHQUAKES AND STRUCTURES
(2023)
Article
Construction & Building Technology
Davood Mostofinejad, Omid Aghamohammadi, Hadi Bahmani, Saeed Ebrahimi
Summary: This study investigates the effects of adding rubber particles and silica fume on the thermal characteristics, energy absorption, and mechanical properties of concrete. The results show that the addition of rubber and silica fume can reduce the thermal conductivity and increase the energy absorption of concrete, but it decreases the compressive strength and flexural strength.
DEVELOPMENTS IN THE BUILT ENVIRONMENT
(2023)
Article
Construction & Building Technology
Davood Mostofinejad, Nasrin Karimi, Bahareh Tayebani
Summary: The study shows that using bacteria as reinforcement in concrete can significantly reduce water absorption and increase compressive strength, especially in concrete reinforced with fibers. The bacteria are capable of forming calcite sediments, with greater deposits formed due to bacterial activity than by the spores used in the surface treatment.
ACI MATERIALS JOURNAL
(2022)
