List of Articles Retrofitting

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  1 - Seismic Vulnerability assessment of concrete railway bridge using nonlinear analyses
  Araliya Mosleh Hamed Hamidi Ahmad Nicknam José Jara Humberto Varum
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  2 - Exploring the Efficiency of Dampers for Repair and Strengthening of Existing Buildings
  F. Barati A. Esfandiari
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  3 - Strengthening Reinforced Concrete Frames by Using Steel Mega Bracing System
  Mohammad amin ُSharifi Abdolrahim Jalali
  The present study investigates the seismic performance of reinforced concrete moment frame system retrofitted with different steel bracing systems. Two types of structural combinations including concentric steel bracing system and steel mega bracing system were used in More

  The present study investigates the seismic performance of reinforced concrete moment frame system retrofitted with different steel bracing systems. Two types of structural combinations including concentric steel bracing system and steel mega bracing system were used in two types of structures with different numbers of stories. These two structures which are designed by 5 and 10 story reinforced concrete moment frame system have poor lateral stiffness. They were considered to compensate for the limitations of drift regulations in areas with high seismic risk and life safety performance level. Then, these frames are improved by concentric steel bracing system and mega bracing system. In this study, the nonlinear static (pushover) analysis was used to evaluate the performance of the structure under the influence of ground motions. Also chord rotation, story drift and base shear were used to compare the response of the improved structure. It was shown that the steel mega bracing system and the concentric steel bracing system are respectively the best types of steel bracing systems for upgrading and retrofitting the structures in terms of drift control regulations, the amount of base shear, the number of plastic hinges, the number of collapse elements and the economic issues. Manuscript profile
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  4 - Numerical Investigation of CFRP Aminate Post Tensioning Effect on RC Beam Performance and Flexural Capacity
  Alireza Mirzaee Ashkan Torabi Arash Totonchi
  10.30495/civil.2022.689098
  Construction of reinforced concrete buildings is known as one of the most common and widely used construction methods in the world and a large number of buildings and other structures are built applying these materials every year. Advances in engineering sciences and th More

  Construction of reinforced concrete buildings is known as one of the most common and widely used construction methods in the world and a large number of buildings and other structures are built applying these materials every year. Advances in engineering sciences and the utility of new materials have improved the quality of construction and industry. The utilization of materials such as FRP or prestressed and post-tensioned systems has been considered by many engineers due to researches performed and their proper performance during past earthquakes.  In the present research, using ABAQUS software, the effect of flexural reinforcement of reinforced concrete beams using prestressed CFRP laminate (Carbon fiber reinforced polymers) has been investigated as a new and widely used method in strengthening and improving the performance of concrete beams. Different percentages of prestressing force according to the tensile capacity of CFRP laminate as an effective parameter in the final strength, have been investigated in this study. The results exhibit that the use of prestressing in CFRP laminate owing to its high tensile capacity and intrinsic performance can have a significant effect on increasing the stiffness and final strength of reinforced concrete beams. Analyses in this field indicate that the amount of prestressing force should not be more than 30% of the tensile strength of the- laminate, which is one of the cases mentioned by recent researches. Prestressing in the laminates also changes the cracking pattern in the critical area of ​​the reinforced concrete beams. Manuscript profile
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  5 - Numerical Study of the Effect of Adding a Posttensioned Stiffener Layer on the Flexural Strength of Reinforced Concrete Beams
  Alireza Mirzaee Ashkan Torabi Amir Tabebordbar
  10.30495/civil.2022.690411
  Retrofitting of buildings and improving their performance has received a lot of attention from researchers and engineers in recent years. With the advancement of technology and the presentation of new materials in the field of construction, the quality of retrofitting a More

  Retrofitting of buildings and improving their performance has received a lot of attention from researchers and engineers in recent years. With the advancement of technology and the presentation of new materials in the field of construction, the quality of retrofitting and improving of structures has also enhanced. Many structures in the world have been built using reinforced concrete materials, which have exhibited a good performance during previous earthquakes, too. The reinforcement of these structures and the presentation of new solutions to improve their performance have also been studied by many researchers and various solutions such as the use of concrete jackets have been proposed and applied. In the present study, using the posttensioned concrete, a new approach is presented to strengthen the flexural strength of reinforced concrete beams using ABAQUS software. In this method, by adding a posttensioned concrete layer to the reinforced concrete beam (base sample) from both sides, its flexural performance has been investigated. The results of the analyses indicate the appropriate behavioural compatibility of this method due to the high tensile capacity of steel cable, which can have a significant effect on ductility, improving  performance, increasing the capacity of reinforced concrete beams and transferring of the plastic joint from the middle span to  of the end of the beam. Manuscript profile
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  6 - The numerical investigation of performance of the connection between the steel braces and RC frames
  Hoda larki Alireza mirgalili
  There are many concrete building without enough resistant against earthquick that need to seismic retrofitte. Using steel bracing is an usual way to seismic retrofitting in current years. For the suitable performance in this method , the connection between steel bracing More

  There are many concrete building without enough resistant against earthquick that need to seismic retrofitte. Using steel bracing is an usual way to seismic retrofitting in current years. For the suitable performance in this method , the connection between steel bracing system and concrete frames is very important. In recent years some experimental researches is done in this field and several method is recommended for connection. For determinating the suitable connection , in this research 4 RC frames retrofitted by using steel bracing system with 4 details in connection  and 1 RC frame without bracing is modeled by using the finite elements method in Abaqus software. the strength of connection 's  elements , stiffness of system and cracking in RC frames are investigated and compared in every model. Results show that the connection between brace and RC frame by bolt to beam and column , also by steel jacket which fixed to column have suitable performance and other types of connection haven't required performance. Manuscript profile
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  7 - The Effect of Cross Beams in Retrofitting of the Roof System with Stress Regulation
  Nobakht Bakhtyari
  Plate girders structure is a major industry which is mainly used in the systems covered by these beams. Reducing deflection and decreasing the maximum bending moment can be considered as a development in methodology. By the use of cross beamsor braced beams, element per More

  Plate girders structure is a major industry which is mainly used in the systems covered by these beams. Reducing deflection and decreasing the maximum bending moment can be considered as a development in methodology. By the use of cross beamsor braced beams, element perpendicular to the girders is provided. In this paper, the effect of stiffness and distance elements development are studied. Differential equation of degree four governing the  behavior of the partial structures which is a quadratic relationship is determined by solving the following mathematical transformations, and the fundamental equations are derived. The resulting equations are solved by a practical problem and the answer to the problem .The modeling  results  are  compared  with the  SAP2000 program. The findingsshow highly accurate implementation and compliance. It is also revealed  that  stiffness  changing elements within the cross can include different amounts of stress, bending moment and improved cover system. Manuscript profile
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  8 - The Role of Retrofitting Rural Housing in Livability of Villages (Case Study: Rural District Mehrooyeh)
  Abdoreza R. Eftekhari H. Lotfi Mehrooyeh M. Pourtaheri R. talebifard
  Livability is defined as a set of conditions for people living in a given area that are the cause of peace, prosperity and satisfaction for a long time, providing its residents. One condition in livability is housing that should be a safe place for purposeful and produc More

  Livability is defined as a set of conditions for people living in a given area that are the cause of peace, prosperity and satisfaction for a long time, providing its residents. One condition in livability is housing that should be a safe place for purposeful and productive individual lifestyle. Rural housing is sometimes manifested in the way of living, livelihood, and ultimately as the forces and factors affecting environmental and social - economic trends. This research is a descriptive-analytic study. Study is conducted in Mehrooyeh village, BaluchAbad, Nomadic pump Mohammadi Sarlak, Village Goldasteh On the Suburban the central part Mehrooyeh one of districts of Mehrooyeh in the Kerman, Iran. Sample size is 251 households that were selected with the use of Cochran formula. From the results, it can be assumed that retrofitting has improved the livability in Mehrooyeh district. And the effects like increasing the tendency to remain in the village and prevent migration to cities, the construction of engineered housing with limited sizes for rural households, mental relaxation, social promotion, and the promotion of safety in times of unpredictable events such as earthquakes can be mentioned as the results of retrofitting. In addition, increase of the added value of the personal property of the villagers, the ability to demonstrate the talents of family members, increase of villagers’ satisfaction, creating jobs for people living in the village, and the transformation of village’s face to modern architecture can be highlighted as the other results. Manuscript profile