About the journal
Welcome to International Journal of Advanced Structural Engineering (IJASE), The Professional Journal of Islamic Azad University, South Tehran Branch serving professionals in analysis and design methods for building and special structures, bridges, dams and other types of structures, in severe condition like wind and earthquake concerned with advanced technologies. Two principal types of papers published in IJASE are contributed research papers and state-of-the-art reviews. IJASE is published quarterly (January, April, July and October) both online and in print. Researchers and practicing structural engineers are cordially invited to submit their contributions and novel research activities for publication. The manuscripts should be submitted electronically using this website; companion with a cover letter specifying that the manuscript is being submitted to International Journal of Advanced Structural Engineering.
Volumes 4 (2012) to 11 (2019) and the related Issues which are open access could be achieved via the following link:
Recent Articles
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Open Access Article
1 - The effect of different arrangements of longitudinal reinforcements on the capacity of wide concrete beams
Javad Mahdian pari alireza faroughiIssue 1 , Vol. 14 , Winter 2024A beam that has a width greater than the width of the column connected to it is called a wide beam. Due to the reduction in the height of the beams in this type of system, many advantages are created, including reducing the costs of molding and construction, increasing MoreA beam that has a width greater than the width of the column connected to it is called a wide beam. Due to the reduction in the height of the beams in this type of system, many advantages are created, including reducing the costs of molding and construction, increasing the execution speed, reducing the height of the floor and of course increasing the number of floors in high-rise buildings, as well as including Other advantages of these beams from the architectural point of view are the hiding of the beams in the roof of the structure. In concrete structure design, ductility is one of the important parameters. The ductile behavior of the structure has a significant effect in reducing the design forces caused by the earthquake due to its energy absorption and loss. The role of reinforcement in the ductility of concrete is very important. In this article, a concrete beam with six different types of longitudinal rebar arrangement has been selected for study and four-point loading has been applied to the models. All models have been analyzed in ABAQUS finite element software. The results indicate that; The pattern of placing the rebar crosswise and diagonally has less hardness, ductility and resistance than other models. The highest amount of energy absorption was related to the model with six bars in a trapezoidal arrangement. Manuscript profile
Most Viewed Articles
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Open Access Article
1 - Experimental and numerical modeling for shear strength of hybrid fiber reinforced concrete beams with stirrups
Mahdi Moradi Mehran Sheikhmohammadi Seyyed Hossein AletahaIssue 3 , Vol. 12 , Summer 2022The use of hybrid fibers in concrete has attracted wide attention in recent years. Using hybrid fibers with different elasticity moduli increases the strength and ductility of fiber reinforced concrete (FRC). In addition, hybrid fibers improve the shear strength of FRC MoreThe use of hybrid fibers in concrete has attracted wide attention in recent years. Using hybrid fibers with different elasticity moduli increases the strength and ductility of fiber reinforced concrete (FRC). In addition, hybrid fibers improve the shear strength of FRC beams significantly. The previous studies have shown that the hybrid use of fibers leads to a phenomenon, called synergy. However, the effect of combining hybrid fibers with stirrups is scantly studied and continues to main unknown. In this study, the effects of stirrups, concrete compressive strength, polypropylene fibers, steel fibers, and their hybrids on the shear strength of FRC beams are investigated. For this purpose, 24 FRC beams were tested in an experimental program. Experimental results show that samples with hybrid fiber have the highest shear performance. Additionally, a new model for simulating these beams' shear strength is presented, using genetic programming technique. The proposed model precisely predicts sample performance. The R2 for this model was 0.868, which is a suitable value due to the complexity of the problem. Manuscript profile -
Open Access Article
2 - Experimental study of fiber concrete slab behavior against high electric heat
Hossein Nematian Jelodar Ata Hojatkashani Rahmat Madandoust Abbas Akbarpour Seyed Azim HosseiniIssue 1 , Vol. 13 , Winter 2023Concrete structures may be exposed to high heat. In such a way that high heat in the vicinity of concrete structures causes damage in concrete. The aim of this study is assessment of effect of electric high heat on the bending capacity, energy absorption, fracture type MoreConcrete structures may be exposed to high heat. In such a way that high heat in the vicinity of concrete structures causes damage in concrete. The aim of this study is assessment of effect of electric high heat on the bending capacity, energy absorption, fracture type and crack distribution of circular fiber concrete slab under monotonic loading. The concrete aggregates with a fracture percentage of 45% are from the mines around Tehran and the fibers used in the concrete are of macrosynthetic type. The concrete mixing design was based on the target compressive strength of 45 MPa and the amount of fibers equal to 0.5% of concrete volume. The heating of the concrete samples was done by a 2400-liter device with a power of 90 KW and maximum temperature of 550 degrees Celsius. To perform slab tests, Dartec9600 device was used with monotonic loading at a rate 0.004 mm/s. based on the Experimental studies conducted on the fiber concrete slab, the application of high heat did not cause concrete peeling but it reduced the capacity of the slab by 89.3% and decreased the energy absorption of the slab compared to the control sample. Also, SEM photos have shown the aggressive destruction of macrosynthetic fibers and the creation of cracks under the effect of high heat in fiber concrete. Manuscript profile -
Open Access Article
3 - Failure area evaluation of the coupler with threaded bar: Experimental and Numerical study
mohamad reza shokrzadeh Fariborz Nateghi Allahe Mohammad Reza Mansoori, pasha pashaIssue 1 , Vol. 12 , Winter 2022The problem of overcrowding at the junction of the rebars is very significant, particularly for seismic details. Mechanical couplers can, thus offer an appealing solution that eliminates the disadvantages of traditional reinforcement splicing. By identifying the target MoreThe problem of overcrowding at the junction of the rebars is very significant, particularly for seismic details. Mechanical couplers can, thus offer an appealing solution that eliminates the disadvantages of traditional reinforcement splicing. By identifying the target area for bar failure, the potential area for failure could be modified with this in mind, it is very useful in assessing the position of the reinforced concrete (RC) plastic hinge. In this context, the present study focuses on the numerical and analytical modelling of the experimentally obtained response of Integrated bar (without coupler) and bars with mechanical coupler to tensile uniaxial tests. Simulation results showed agreement with the experimental response in terms of load–elongation curve, Von Mises yield and failure mode .After validating the model, alternative designs (diameter, height and thickness of mechanical couplers and bar) were numerically tested to study the influence of the geometry of the structural system on the failures mechanical coupler. Overall results indicated that the optimum design would be the one with an increased diameter in the thread area of both the bar and the mechanical coupler. For this improved configuration, the load-bearing capacity was Similar to the Integrated bar (without coupler) Cases. Manuscript profile -
Open Access Article
4 - Numerical investigation of settlement effect caused by tunneling on surface structures based on pile group
Alireza Darvishpour Asadollah Ranjbar Karkanaki Hossein Meshki Mohsen ParvizIssue 4 , Vol. 13 , Autumn 2023In this study, an attempt has been made to investigate the effect of various factors on the super structures by modeling the structures based on the pile group and its interaction with urban tunnels. The effect of various parameters such as the presence of pile group, t MoreIn this study, an attempt has been made to investigate the effect of various factors on the super structures by modeling the structures based on the pile group and its interaction with urban tunnels. The effect of various parameters such as the presence of pile group, the horizontal distance of the center of the tunnel from the center of the foundation, the vertical distance of the tunnel to the tip of the piles, the length of the piles and the height of the super structure on the tunnel-soil-structure interaction has been investigated. Based on the analysis, it was observed that the placement of the pile group in the substructure will lead to the reduction of settlement caused by tunneling in the superstructure. From the point of view of the horizontal distance of the tunnel from the center of the superstructure.The location of the structure in the critical range of the tunnel, which includes two lines with the internal friction angle of the soil relative to the vertical, the structure has the greatest impact from tunneling The increase in the length of the piles due to the change in the axial force of the piles increases the period of the foundation and vice versa reduces the settlement of the structure. In general, the side piles in the pile group are less affected by tunneling, but the central pile suffers a significant decrease in axial force. Manuscript profile -
Open Access Article
5 - Experimental investigation of Carbon, Glass and Steel fibers effect on failure strength and slump of standard concrete samples
Sohrab hosseini kheirabad Ehsan Kazeminezhad Soroush SafakhahIssue 3 , Vol. 12 , Summer 2022Fiber reinforced concretes due to their acceptable performance on structural members have been evaluated in many research. Planty of materials have been used in combination with the concrete and caused researcher focused on the concrete compressive strength. In this exp MoreFiber reinforced concretes due to their acceptable performance on structural members have been evaluated in many research. Planty of materials have been used in combination with the concrete and caused researcher focused on the concrete compressive strength. In this experimental regard, effects of three types of fibers such as Glass, Carbon and double hook steel on tensile strength, compressive strength and slump of standard concrete samples have been investigated. Four various weight ratios for any of these fibers are used (0.5, 1.0, 1.5 and 2% of cement weight). Analysis is done on the 7 and 28 days of concrete age and a simple concrete sample is existing to compare with fiber concrete samples. Results showed that in all dosage of Glass and Steel, compressive strength is increased but in samples with carbon fibers in 1.5 and 2% is decreased. Tensile strength in all used dosage of fibers is increased. Slump values of all fiber samples are decreased and maximum decrease experienced in glass fiber samples. Manuscript profile -
Open Access Article
6 - The effect of different arrangements of longitudinal reinforcements on the capacity of wide concrete beams
Javad Mahdian pari alireza faroughiIssue 1 , Vol. 14 , Winter 2024A beam that has a width greater than the width of the column connected to it is called a wide beam. Due to the reduction in the height of the beams in this type of system, many advantages are created, including reducing the costs of molding and construction, increasing MoreA beam that has a width greater than the width of the column connected to it is called a wide beam. Due to the reduction in the height of the beams in this type of system, many advantages are created, including reducing the costs of molding and construction, increasing the execution speed, reducing the height of the floor and of course increasing the number of floors in high-rise buildings, as well as including Other advantages of these beams from the architectural point of view are the hiding of the beams in the roof of the structure. In concrete structure design, ductility is one of the important parameters. The ductile behavior of the structure has a significant effect in reducing the design forces caused by the earthquake due to its energy absorption and loss. The role of reinforcement in the ductility of concrete is very important. In this article, a concrete beam with six different types of longitudinal rebar arrangement has been selected for study and four-point loading has been applied to the models. All models have been analyzed in ABAQUS finite element software. The results indicate that; The pattern of placing the rebar crosswise and diagonally has less hardness, ductility and resistance than other models. The highest amount of energy absorption was related to the model with six bars in a trapezoidal arrangement. Manuscript profile -
Open Access Article
7 - Numerical investigation of a new structural configuration of a concrete barrier wall under the effect of blast loads
Ahmed K. Taha Zhengguo Gao Dahai Huang M. S. ZahranIssue 1 , Vol. 11 , Winter 2019AbstractIn this study, a non-linear three-dimensional hydrocode numerical simulation was carried out using AUTODYN-3D, whichis an extensive code dealing with explosion problems. A high explosive material (comp-B) is blasted against several concretewall barriers. The mod MoreAbstractIn this study, a non-linear three-dimensional hydrocode numerical simulation was carried out using AUTODYN-3D, whichis an extensive code dealing with explosion problems. A high explosive material (comp-B) is blasted against several concretewall barriers. The model was first validated using referenced experimental tests and has shown good results. Several numericalmodels were carried out to study the effect of changing the shape of wall barrier from flat to convex curve and concavecurve, and also investigated the effect of changing the angle of curvature. The results showed that changing the shape of awall barrier from flat to convex curve has the best performance in mitigating the effect of blast waves. It is also concludedthat convex walls with 60° angle of curvature have the best performance compared to other barrier walls. Manuscript profile -
Open Access Article
8 - Combined Porcelain Ceramic and Recycled Concrete Aggregates Used as Replacement for Coarse Aggregates in Concrete
Sayed Behzad Talaeitaba Maedeh DehghaniIssue 3 , Vol. 12 , Summer 2022The increasing production of construction waste on the one hand and the use of concrete as a widely used material in the construction industry, on the other hand, has always led researchers to reuse construction waste in concrete. Among the recycled materials that can b MoreThe increasing production of construction waste on the one hand and the use of concrete as a widely used material in the construction industry, on the other hand, has always led researchers to reuse construction waste in concrete. Among the recycled materials that can be used in concrete, we can mention porcelain ceramic and recycled concrete. In the present study, these two types of recycled aggregates (recycled porcelain ceramics and recycled concrete) alone and together in different percentages of 20%, 40%, and 60% are used as the replacement of coarse aggregates in concrete with a strength of more than 50 MPa and high flowability. Slump test, compressive and flexural strength, water absorption, and water penetration tests have been performed on 150 samples made in 10 mixing designs along with an SEM test. The results showed that all the mixing designs had slumps of more than 180 mm. The compressive strength of the control sample averaged 60 MPa and the samples containing recycled aggregates averaged 68 MPa. Also, by combining two types of recycled aggregates, both the 7-day and 28-day strength increased with increasing replacement percentage with a linear trend. The highest increase was 28% for porcelain aggregates and 17% for combined recycled aggregates. In addition, the water penetration rate in the samples containing the combined recycled aggregates showed a significant decrease compared to the control sample. In the SEM test, it was observed that the samples containing the combined aggregates had a thicker and denser matrix. Manuscript profile -
Open Access Article
9 - Seismic Evaluation of Tall Buildings with End Shear Walls by Fragility Curve
Ali Kheyroddin Mehran Akhavan Salmassi Ali HemmatiIssue 2 , Vol. 12 , Spring 2022Lateral bearing systems affect tall structures’ behavior against lateral forces. Shear walls are one of the influential structural members against lateral forces. However, the ends of shear walls undergo severe stress under lateral forces connected to a reinforced MoreLateral bearing systems affect tall structures’ behavior against lateral forces. Shear walls are one of the influential structural members against lateral forces. However, the ends of shear walls undergo severe stress under lateral forces connected to a reinforced concrete shear wall called end shear wall to improve the end structure behavior of the shear walls. Adding the end shear wall by joining the ends of the shear walls strengthened the roof rigidity and decreased the stress intensity at the concrete core end. This study modeled two 30-story concrete structures with frame and reinforced concrete shear walls with and without end shear walls to evaluate the end shear walls’ behavior. First, the structure members were simulated in OpenSees to check the non-linear behavior. Then, the structures were subjected to remote domain records to examine the fragility curves. The results indicated that the end shear wall increased the maximum acceleration at maximum probability in low, medium, severe, and complete collapse states by 50, 28, 27, and 38%, respectively. The fragility curves showed a more appropriate behavior of the 30-story structure with end shear walls in low, medium, high, and complete damage states. This system is more efficient than others since the end shear wall cuts the initial period of the structure in half (from 4 to 2s in a 30-story structure with an end wall). This drastic decrease can add stories to the building. Stairs and elevators can be built into the structure instead of the end shear wall for more flexibility. Manuscript profile -
Open Access Article
10 - Performance Evaluation and Comparison of Schools with Masonry System Treated by Braces, FRP Strips and Friction Dampers Using Fragility Curves (Case Study: Khorram Abad)
Saeed BahariPour Mahdi Nani Mojtaba Hosseini Abdolreza sarvghad Moghadam Mehran Mehran S. RazzaghiIssue 3 , Vol. 13 , Summer 2023Due to the importance of seismicity in the region of Iran, the improvement and retrofitting of structures has always been the focus of competent employers and engineers. In order to achieve the goals of this research, a three-story concrete school structure in need of i MoreDue to the importance of seismicity in the region of Iran, the improvement and retrofitting of structures has always been the focus of competent employers and engineers. In order to achieve the goals of this research, a three-story concrete school structure in need of improvement has been selected. Then, the investigation of possible improvement options (three improvement options: 1 with braces, 2 with friction damper, 3 using FRP in the columns) has been done in Opensees software. In the following, incremental nonlinear dynamic modeling and analysis under selected earthquake records using the recommended FEMA P695 accelerometers for co-based seismic records (5 acceleration maps for the far field and 5 acceleration maps for the near field) has been performed. Then a comparison between the fragility curves for different states has been made. In this research, the behavior of the building against different earthquake intensities is shown According to the results obtained from other non-linear analyses, it can be seen that the maximum capacity obtained is in good agreement with the results of these analyzes and this method is very suitable for evaluating the behavior of buildings and ultimate capacities against earthquakes. Also, it can be a good alternative method for approximate methods such as pushover analysis to determine the performance level of the building and to determine the behavior of the building. Manuscript profile
