List of Articles Leila Hosseinzadeh

• Open Access Article
  • Abstract Page
  • Full-Text
  
  1 - Investigating of linear and nonlinear performance of the simpson strong-tie connection
  Ali Ghamari Farzin Ghaffari Leila Hosseinzadeh
  10.30495/civil.2023.1892987.1174
  After the Northridge earthquake, it was found that the beam-to-column connections in the moment frames were weak and needed to be revised. In recent years, the use of bolted connections have expanded and replaced almost welded connections. The US Code of Conduct (AISC35 More

  After the Northridge earthquake, it was found that the beam-to-column connections in the moment frames were weak and needed to be revised. In recent years, the use of bolted connections have expanded and replaced almost welded connections. The US Code of Conduct (AISC358-16) introduced a new connection called the Simpson Connection, a semi-rigid connection with the idea of damage control. Progressive connection is a new and smart type of screw connection that includes a weakened plate, end plate, corner as well as a buckle plate. The main purpose of this study is to investigate the linear and nonlinear behavior of Simpson connectivity using ABAQUS software. The baseline sample was selected from the model outlined in US Code (AISC358-16). To gain a better understanding of the new Simpson junction model, 14 numerical specimens were modeled and the strengths and stiffness of the models were compared. In this connection, the geometry of weeded plate and its performance is important. In so doing, variables such as mid-length, mid-width, initial length, as well as stiffeners were evaluated in the initial length of the weakened plate. The model with a thickness of 30 mm thicker than the other models with respect to the mentioned characteristics, showed acceptable results including anchor tolerance of 1010 kN and energy absorption of 55.53 kN which showed its use in seismic regions. Above is appropriate. Manuscript profile
• Open Access Article
  • Abstract Page
  • Full-Text
  
  2 - Investigating steel slit dampers behavior in concrete structures
  Leila Hosseinzadeh Seyed Majid Alavinia Ali Ghamari Abbas Akbarpour
  10.30495/civil.2023.1910683.1197
  Iran is one of the most seismic countries in the world. Therefore, strengthening the existing structures is essential. Utilization of dampers in structures presumed as one of the best and common methods in seismic retrofitting. Dampers are components which are mostly us More

  Iran is one of the most seismic countries in the world. Therefore, strengthening the existing structures is essential. Utilization of dampers in structures presumed as one of the best and common methods in seismic retrofitting. Dampers are components which are mostly used in increasing the attenuation and reducing the energy of earthquake. It is determined in various researches that dampers can decrease the displacement which is induced by earthquake efficiently. In these cases, the behavior of most components of structures is remained elastic. In this study, the effects of slit steel dampers (SSD) through concrete structures are evaluated. Therefore, four models of SSD were selected as described in follow: 3 single slit, 3 double slit, 5 single slit and 5 double slit in three thickness of 6, 8 and 10 (mm), which are used in concrete frame with single diagonal brace where connected to beam-column. The effects of increasing the number of slits from 3 to 5, from single to double and increasing the thickness were studied. The results show that by increasing the thickness of dampers, the area of force-displacement diagram, rigidity and strength are increased in frames. The frames which consisted with double 3 slit dampers shows better performance than 5 slit dampers. The frames with single 5 slit dampers by 10 mm thickness, decreased by 4.9% in rigidity, in comparison with double samples. Also, It is decreased in rigidity by 2.9% and 7.3% for single and double models, respectively. Manuscript profile
• Open Access Article
  • Abstract Page
  • Full-Text
  
  3 - Investigation of linear and nonlinear performance of the simpson strong-tie connection
  Ali Ghamari Farzin Ghaffari Leila Hosseinzadeh
  20.1001.1.23456310.1399.17.3.3.9
  After the Northridge earthquake, it was determined that the beam-to-column connections in the moment frames were weak and needed to be revised. In recent years, the use of bolted connections have expanded and replaced almost welded connections. The US Code of Conduct (A More

  After the Northridge earthquake, it was determined that the beam-to-column connections in the moment frames were weak and needed to be revised. In recent years, the use of bolted connections have expanded and replaced almost welded connections. The US Code of Conduct (AISC358-16) introduced a new connection called the Simpson Connection, which is a semi-rigid connection with the idea of ​​damage control. Progressive connection is a new and smart type of screw connection that includes a weakened plate, end plate, corner as well as a buckle plate. The main purpose of this study is to investigate the linear and nonlinear behavior of Simpson connectivity using ABAQUS software. The baseline sample was selected from the model outlined in US Code (AISC358-16). To gain a better understanding of the new Simpson junction model, 14 numerical specimens were modeled and the strengths and weaknesses of the models including ductility, stiffness, strength, and energy absorption of the models were compared. In this connection, the geometry of weakened plate and its performance is important. In so doing, variables such as mid-length, mid-width, initial length, as well as stiffeners were evaluated in the initial length of the weakened plate. The model with a thickness of 30 mm thicker than the other models with respect to the mentioned characteristics, showed acceptable results including anchor tolerance of 1010 kN.m and energy absorption of 55.53 kN/mm which showed that its use is suitable for areas with high seismicity. Manuscript profile
• Open Access Article
  • Abstract Page
  • Full-Text
  
  4 - Investigating the behavior of steel slit dampers in concrete structures
  Seyed Majid Alavinia Leila Hosseinzadeh Ali Ghamari Abbas Akbarpour
  10.30495/civil.2021.682514
  20.1001.1.23456310.1400.18.1.6.5
  Iran is considered as one of the most seismically active regions in the world. Therefore, the need for seismic strengthening of the existing structures is essential. One of the suitable methods in seismic reinforcement of buildings is the u More

  Iran is considered as one of the most seismically active regions in the world. Therefore, the need for seismic strengthening of the existing structures is essential. One of the suitable methods in seismic reinforcement of buildings is the use of dampers. Dampers are components, which are mostly utilized to increase damping and deplete seismic energy. Numerous studies have indicated that dampers can reduce seismic displacement. In this way, the performance of most of the load-bearing members of the structure remains in the elastic range.  In this research, the effect of using slit steel dampers (SSD) on concrete structures was evaluated. Therefore, four models of SSD were selected as following: 3 single slit, 3 double slit, 5 single slit and 5 double slit in three thickness of 6, 8 and 10 mm, which were placed in a concrete frame with a single diagonal brace at the connection of the brace to the column beam. The effects of increasing the number of slits from 3 to 5, from single to double and increasing the thickness were studied. The results exhibited that by increasing the thickness of dampers, the area of force-displacement diagram, stiffness and strength were increased in frames. The frames, which are consisted of double 3-slit dampers presented better performance than 5-slit dampers. So that, the reduction of rigidity of frame with single 5-slit dampers in a thickness of 10 mm, was 4.9% in comparison with double samples. In addition, it is decreased in stiffness by 2.9% and 7.3% for single and double models, respectively Manuscript profile