Article
Construction & Building Technology
Seyed Mehdi Davoodnabi, Seyed Mohammad Mirhosseini, Mahdi Shariati
Summary: The behavior of angle shear connectors in steel-concrete composite floors under temperature increase was investigated numerically, showing that heat affects the performance of shear connectors. Connector dimensions, concrete strength, and temperature value directly affect the final strength of the floor, with increasing angle height potentially increasing strength up to a certain limit. Increasing the temperature up to 850 degrees C leads to significant reduction in shear strength.
STEEL AND COMPOSITE STRUCTURES
(2021)
Article
Engineering, Civil
Nasrin Bakhshayesh Eghbali, Payam Andamnejad
Summary: This study examined the behavior of rigid shear connectors in concrete encased steel (CES) composite columns. The results, obtained from finite element analysis and validated against experimental results, showed that the length, thickness, and penetration depth of the shear connector, as well as the compressive strength of concrete and the thickness of concrete cover, significantly influenced the strength and stiffness of the shear connector. Increasing the length, penetration depth, and thickness of the shear connector and the concrete cover enhanced the residual strength level. Compared to stud shear connectors, rigid shear connectors exhibited smaller slippage between concrete and steel, providing greater stiffness and strength, while still offering sufficient ductility due to being encased in reinforced concrete. Additionally, a formula to predict the ultimate shear capacity of the rigid shear connector in CES composite columns was suggested based on the parametric studies.
Article
Chemistry, Physical
Linli Duan, Xin Nie, Han Su, Jike Tan
Summary: This study investigated the dynamic behavior of composite frame structures with uplift-restricted and slip-permitted (URSP) connectors under seismic loads. The results showed that the arrangement of full-span URSP connectors had a significant influence on the dynamic behavior of the systems, while the partial arrangement had little effect, maintaining good seismic performance.
Article
Engineering, Civil
Yanmei Gao, Chengjun Li, Xuefei Wang, Zhixiang Zhou, Liang Fan, Junlin Heng
Summary: This paper investigates the shear-slip behavior of PCSS connectors in prefabricated bridges through experiments and finite element analysis. The research highlights the enhanced shear capacity and ductility of PCSS specimens, with the superior performance attributed to the special design of PCSS connectors.
ENGINEERING STRUCTURES
(2021)
Article
Engineering, Civil
Nathan Vella, Pinelopi Kyvelou, Spiridione Buhagiar, Leroy Gardner
Summary: An experimental investigation was conducted to study the behavior of bespoke shear connectors in cold-formed steel-timber structures. The innovative shear connectors showed higher shear resistance and slip modulus compared to ordinary self-drilling screws. An analytical model was extended and validated to accurately predict the response of the innovative connectors.
ENGINEERING STRUCTURES
(2023)
Article
Construction & Building Technology
Shaochun Ma, Yuanyuan Lou, Peng Bao
Summary: Shear connectors play a vital role in steel-concrete composite beams, but failures due to unreliable connections still occur. This study proposes a novel bolted nail and its combined connector, which eliminates the influence of certain factors on the mechanical performance of shear connectors. Experimental research was conducted to obtain the shear resistance, failure mechanism, and stress-strain properties of the connectors. Comparative analysis showed that the stud connectors performed better in terms of deformation and shearing resistance compared to bolted connectors. The research findings have practical implications for actual projects and provide reference for similar connectors' research.
CASE STUDIES IN CONSTRUCTION MATERIALS
(2022)
Article
Engineering, Civil
Chang-Hui Li, Jia-Bao Yan, Hui-Ning Guan
Summary: The study developed a finite element model for enhanced C-channel connectors in steel concrete-steel sandwich structures, which accurately simulated the shear behaviors of the connectors. Through parametric studies, key influencing parameters on shear behaviors of the connectors were analyzed to provide design recommendations.
Article
Green & Sustainable Science & Technology
Da Wang, Benkun Tan, Shengtao Xiang, Xie Wang
Summary: Fatigue crack propagation analysis and fatigue life calculation were conducted to investigate the fatigue performance of stud connectors in steel-concrete structures. The results showed that the type of fatigue crack propagation and the initial crack significantly influence the fatigue life of the stud. This paper provides a reference for evaluating the fatigue performance of stud connectors and accurate evaluation of their fatigue life aligns with the concept of sustainable development.
Article
Construction & Building Technology
Chenggong Wang, Diankai Cao, Xiaoyang Liu, Yucai Jing, Wenzhuo Liu, Guotao Yang
Summary: This paper investigates the initial elastic behaviors of three types of bolted shear connectors used in steel-concrete composite structures using finite element analysis (FEA). After verifying the FE models against experimental results, a parametric study is carried out to investigate the effects of eight parameters on the initial shear stiffness and tension stiffness as well as coupling stiffness. Empirical formulas are developed for obtaining the initial elastic stiffness of the bolted shear connectors, and further FEA is performed to validate the formulas.
ADVANCES IN CIVIL ENGINEERING
(2022)
Article
Engineering, Civil
Yong Du, Jian Jiang, Guo-qiang Li, Hong-hui Qi
Summary: An improved TMA model is proposed in this study to accurately and reasonably determine the fire resistance of composite slabs. The model is validated against experimental and numerical results and shows better prediction of mid-span deflection and fire resistance than existing models.
Article
Engineering, Civil
Xiuyu Liang, Xiyan Yi, Bing Wang, Xiaoling Liu
Summary: This study investigates the slip degradation rule of stud connectors in their service life using push-out specimens under static, fatigue, and residual slip tests. The slip growth and distribution characteristics of the connectors during fatigue and static load were analyzed. An improved stud load-slip model considering ultimate slip was established, and a load-slip calculation model for the full process of studs under any number of fatigue cycles was verified. The influence of key parameters in stud connector slip was also discussed. The results provide important insights into understanding the slip degradation behavior of stud connectors.
Article
Construction & Building Technology
Sha-Sha Song, Fei Xu, Ju Chen, Fengjiang Qin, Yuner Huang, Xin Yan
Summary: The performance and feasibility of tapered iron bolt shear connectors in demountable composite beams were investigated in this study. The results showed that TIB connectors can be replaced without damaging other components and have a moderate impact on shear capacity.
JOURNAL OF BUILDING ENGINEERING
(2022)
Article
Engineering, Civil
Farjam Asghari Ghajari, Hossein Yousefpour
Summary: After fire incidents, it is important to assess the ability of reinforced concrete structures to withstand seismic loads. This paper investigates the bond-slip behavior of RC flexural members that have been exposed to elevated temperatures. Various specimens were fabricated and subjected to heating and cooling before loading in monotonic or cyclic patterns. The results show a decrease in bond strength and changes in bond-slip loops after exposure to elevated temperatures. The cyclic bond strength is found to be lower than the monotonic bond strength and is correlated with the residual compressive strength of concrete.
ENGINEERING STRUCTURES
(2023)
Article
Construction & Building Technology
Min Jae Park, Young K. Ju
Summary: This study introduced a steel-polymer composite floor filled with PU and investigated its structural and fire performance. A finite element model considering the phase changes of amorphous polymers was proposed to analyze the behavior of the floors. Factors such as porosity and gasification volumetric expansion were found to influence the structural fire behavior of the composite floors.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Engineering, Civil
Lipeng Sun, Yongjian Liu, Haitao Wang, Fengrong Shi, Jiang Liu, Lei Jiang
Summary: This study investigated the critical parameters affecting the elastic tensile stiffness of Perfobond rib connectors (PBLs) used in cable-stayed bridges. Experimental and finite element analysis were conducted to propose accurate equations for predicting the tensile stiffness of PBLs. The results showed that the tensile stiffness of PBLs increased with rib thickness, hole diameter, and concrete strength, but decreased with embedded depth. The width of the rib had no influence, and the transverse rebar diameter slightly increased the tensile stiffness. The proposed equations based on the spring model accurately predicted the tensile stiffness of PBLs.
ENGINEERING STRUCTURES
(2023)
Article
Computer Science, Interdisciplinary Applications
Mahdi Shariati, Mohammad Saeed Mafipour, Behzad Ghahremani, Fazel Azarhomayun, Masoud Ahmadi, Nguyen Thoi Trung, Ali Shariati
Summary: The study introduces a novel hybrid ELM-GWO model to predict the compressive strength of concrete with partial replacements for cement. The results demonstrate that combining the ELM model with GWO can efficiently improve performance, leading to superior performance indices compared to other models.
ENGINEERING WITH COMPUTERS
(2022)
Article
Construction & Building Technology
Haider Hamad Ghayeb, Hashim Abdul Razak, N. H. Ramli Sulong, Kim Hung Mo, Fuad Abutaha, Meisam Gordan
Summary: Grouted couplers were used as an alternative to traditional steel bar lapping method to avoid bar congestion issues and reduce the required quantity of steel bars. Short-threaded grout couplers performed best in high seismic zones, while short-threaded grout couplers and long grout couplers were suitable for low-to-medium seismic zones.
JOURNAL OF BUILDING ENGINEERING
(2021)
Article
Construction & Building Technology
Mahdi Shariati, Ali Shariati, Nguyen Thoi Trung, Parham Shoaei, Farshad Ameri, Nasrollah Bahrami, Saeid Narimani Zamanabadi
Summary: This study evaluated the effects of alkali activator solution and utilization of silica fume on durability and microstructural characteristics of alkali-activated GGBFS pastes. The optimal paste with 12 M NaOH solution and SS:SH ratio of 2.5 exhibited the best performance. The inclusion of SF reduced water absorption and increased electrical resistivity, and the SS:SH ratio was found to have a higher contribution to acid attack resistance of AAS pastes.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Green & Sustainable Science & Technology
Maziar Yazdani, Kamyar Kabirifar, Boadu Elijah Frimpong, Mahdi Shariati, Mirpouya Mirmozaffari, Azam Boskabadi
Summary: The increase in construction and demolition waste due to urbanization and population growth has raised concerns over environmental impacts. A novel simulation-optimization approach using a hybrid Genetic Algorithm is proposed to optimize waste collection routing. The results demonstrate high performance of the proposed simheuristic algorithm.
JOURNAL OF CLEANER PRODUCTION
(2021)
Article
Construction & Building Technology
Shahin Rajaei, Parham Shoaei, Mahdi Shariati, Farshad Ameri, Hamid Reza Musaeei, Babak Behforouz, Jorge de Brito
Summary: This study evaluated the effects of using crumb rubber and polypropylene fibre in alkali-activated slag mortars on the properties of concrete. The results showed that rubberized mixes reduced mechanical strength, while polypropylene fibre enhanced both mechanical strength and shrinkage resistance. The ecological and economic analysis revealed that rubberized mixes were more environmentally friendly and cost-efficient.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Construction & Building Technology
Soheil Jahandari, Zhong Tao, Mohammad Saberian, Mahdi Shariati, Jie Li, Masoumeh Abolhasani, Mostafa Kazemi, Aida Rahmani, Maria Rashidi
Summary: The research found that the combined application of lime and geogrid to clayey subgrade significantly enhanced its ductility and geotechnical characteristics, but excessive water pressure caused separation between geogrid layers and subgrade, leading to reduced uniformity and consistency. Moreover, controlling moisture to optimal levels can maximize the performance of subgrade, while excess moisture beyond optimal levels resulted in more voids, decreasing geotechnical properties.
ROAD MATERIALS AND PAVEMENT DESIGN
(2022)
Article
Engineering, Civil
Haider Hamad Ghayeb, N. H. Ramli Sulong, Hashim Abdul Razak, Kim Hung Mo
Summary: This study investigates the performance behavior of novel precast beam-to-column joints using engineered cementitious composite (ECC) with different types of fibers under cyclic loading. The results show that the precast joints exhibit better seismic performance compared to the conventional monolithic joint. This is attributed to the higher tensile and flexural strengths of the ECC fibers, better mechanical bridging and bonding, increased resistance to slippage for reinforcing bars, and avoidance of spalling concrete in the joint area. The novel precast joints can potentially withstand high earthquake activities due to their superior seismic performance.
ENGINEERING STRUCTURES
(2022)
Article
Engineering, Civil
T. Tafsirojjaman, David P. Thambiratnam, N. H. Ramli Sulong, Sabrina Fawzia
Summary: This study aims to develop a finite element (FE) modelling numerical approach to simulate the cyclic response of CFRP strengthened SHS beam-column connections. The research findings show that CFRP strengthened connections have improved structural performance and less tendency for buckling.
THIN-WALLED STRUCTURES
(2022)
Article
Construction & Building Technology
Mahdi Zeinizadeh Jeddi, N. H. Ramli Sulong, Tohid Ghanbari-Ghazijahani
Summary: This research proposes a new blind bolt called TubeBolt for connecting I-beams to concrete-filled tubular columns. The study aims to solve common problems in bolted connections in CFT columns. Tests were conducted to examine the performance of TubeBolt connections compared to EHB bolts. The results showed that TubeBolt connections reduce common problems, provide higher energy dissipation and ductility, and have a larger hysteretic loop area. TubeBolt connections also have higher capacity and stiffness, avoiding severe column face deformations. The study concluded that TubeBolt connections meet ductility and seismic design requirements for moment-resisting frames.
JOURNAL OF CONSTRUCTIONAL STEEL RESEARCH
(2022)
Article
Green & Sustainable Science & Technology
Karim Nouri, Nor Hafizah Ramli Sulong, Zainah Ibrahim, Mohammad Bazzaz, H. Elhosiny Ali
Summary: This numerical study examines the behavior of novel stiffened angle shear connectors in solid concrete slabs at different temperatures. A nonlinear finite element model is developed and validated with experimental data. The results show a significant decrease in the ultimate strength of the connectors at high temperatures, but they perform similarly to ordinary C-shaped connectors at temperatures between 700-850 degrees C. The stiffened connectors exhibit greater ductility at elevated temperatures and increasing their height and width enhances their shear strength significantly. The findings demonstrate the importance of the connector's height in improving shear strength capacity compared to ordinary C-shaped connectors.
Article
Engineering, Civil
Pouria Ayough, Zainah Ibrahim, N. H. Ramli Sulong, Reventheran Ganasan, Haider Hamad Ghayeb, Mohamed Elchalakani
Summary: This study evaluated the influence of bolted shear studs on the axial performance of circular concrete-filled double-skin steel tubular (CFDST) columns. Through experimental and finite element analysis, it was found that bolted shear studs can prevent shear failure, significantly increase ductility, and improve confinement effect. The local buckling strength of the outer tube decreases when the spacing of the bolted shear studs is reduced.
Article
Engineering, Civil
Tohid Ghanbari-Ghazijahani, Mojtaba Gorji Azandariani, Vanissorn Vimonsatit, N. H. Ramli Sulong
Summary: This study investigates the structural response of concrete-filled steel tubes (CFST) through experimental and analytical sections. The authors perform experiments on CFST columns with different proportions of recycled redwood timber chips embedded in the concrete. An analytical investigation is also conducted using equations from four design codes to predict the axial capacity. The results show that embedding waste timber in concrete has the potential to upcycle wood residue into a commercially viable product.
THIN-WALLED STRUCTURES
(2023)
Article
Engineering, Civil
T. Tafsirojjaman, Nicholas Wirth, David P. Thambiratnam, N. H. Ramli Sulong, Allan Manalo, Sabrina Fawzia
Summary: This study conducted detailed experiments to investigate the use of carbon fibre reinforced polymer (CFRP) and glass fibre reinforced polymer (GFRP) as strengthening measures for square hollow sections (SHS). The results showed that the strengthened members exhibited improved performance, including lower moment degradation, higher load-carrying capacity, and greater stiffness and ductility. Additionally, GFRP strengthening was found to be more effective for cyclically loaded steel SHS. The developed theoretical model accurately predicted the ultimate moment capacities of the strengthened SHS members.
STRUCTURE AND INFRASTRUCTURE ENGINEERING
(2023)
Article
Engineering, Civil
Mumtahina Akter, N. H. Ramli Sulong, Pouria Ayough, T. Tafsirojjaman, Sabrina Fawzia
Summary: This paper presents a nonlinear finite element analysis of circular concrete-filled steel tubes with rubberized infill concrete under flexure. The FE models were validated against experimental test results and used to investigate the effect of various parameters on the beams. The study found that steel tube properties, loading distance, and span length had different impacts on the beams' ultimate capacity and ductility.
Article
Construction & Building Technology
Seyed Mehdi Davoodnabi, Seyed Mohammad Mirhosseini, Mahdi Shariati
Summary: The behavior of angle shear connectors in steel-concrete composite floors under temperature increase was investigated numerically, showing that heat affects the performance of shear connectors. Connector dimensions, concrete strength, and temperature value directly affect the final strength of the floor, with increasing angle height potentially increasing strength up to a certain limit. Increasing the temperature up to 850 degrees C leads to significant reduction in shear strength.
STEEL AND COMPOSITE STRUCTURES
(2021)
