Seismic Behavior of a Non-seismic Precast Concrete Beam to Column Connection and Comparison with Cast In-situ Reinforced Concrete Beam to Column Connections designed Based on ACI 318 Seismic Provisions

نوع: Type: thesis

مقطع: Segment: masters

عنوان: Title: Seismic Behavior of a Non-seismic Precast Concrete Beam to Column Connection and Comparison with Cast In-situ Reinforced Concrete Beam to Column Connections designed Based on ACI 318 Seismic Provisions

ارائه دهنده: Provider: Reza Zarei Panah

اساتید راهنما: Supervisors: Dr. Mostafa Moghadasi

اساتید مشاور: Advisory Professors:

اساتید ممتحن یا داور: Examining professors or referees: Dr. Fereydon Rezaei, Dr. Amir Rezaei Samti

زمان و تاریخ ارائه: Time and date of presentation: 10/15/2023

مکان ارائه: Place of presentation: Seminar 1 of civil group

چکیده: Abstract: Today, with the increase in population, the need to provide and build fast and durable housing has become a priority for countries. This can only be achieved by building precast structures. The construction of precast buildings and structures has several advantages over integrated structures with in-situ method of construction, these advantages include: increasing the quality of construction, increasing the durability of precast concrete structures due to the use of expert labor and production, construction in controlled environments, reducing the duration. The construction of precast parts due to the use of isolated environments and controlled conditions in the factory and the reduction of the duration of the construction of the structure at construction site due to the low effectiveness of construction and the construction of these structures in bad weather conditions, the reduction of operational costs due to the reduction of the duration of construction and the possibility of a quick return on investment. The construction of precast structures, while having many advantages, also has challenges at the design and construction section. One of the most important challenges of building precast buildings is to create a suitable connection to transfer and distribute loads to the structure between precast parts. One of the most important connections in precast structures is the beam-to-column connection, and most of the damage caused by earthquake loads occurs in this part of precast structures. Until now, many seismic studies have been conducted on the seismic precast beam and column connections, but seismic studies have been conducted on the precast beam and column connections that were made without observing the seismic criteria. In this research, in order to investigate the seismicity of a non-seismic precast connection sample, first the laboratory sample was simulated in Abaqus software and the loading and boundary conditions of the laboratory sample were applied to the software model. The output and parameters of the software were compared with the laboratory results. After ensuring the verification of the results, 36 models were built in Abaqus software. 15 precast models (seven models similar to the laboratory sample, seven models with minimum tensile reinforcement at the bottom of the beam and one reinforced sample with seismic requirements) and 21 integrated reinforced concrete models complying with the seismic requirements of ACI 318-19 (ordinary moment frame, intermediate moment frame and special moment frame) has been analyzed for comparison. The effect of the resistance of different characteristics of concrete on the seismic behavior of precast and monolithic reinforced concrete models was also evaluated. After verification of the results obtained from the analysis, it was concluded that with the seismic improvement of the precast shear strength models, the energy dissipation capacity and hardness of the samples increases. The percentage increase in shear strength, stiffness and energy dissipation capacity was higher for the reinforced precast sample and lower for the normal seismic reinforced concrete integrated sample. The influence of the characteristic strength of concrete improved the seismic parameters as expected. According to the failure parameters, it was concluded that seismic improvement causes dispersion in tensile and compressive failure, but the intensity and depth of compressive failures are reduced, also with the increase of the characteristic strength, the volume of the compressive and tensile failure area is reduced and the intensity of compressive failures is also reduced. The ductility of the models increases with the seismic improvement of the connection, and this increase in ductility for the reinforced precast sample increased by 280% compared to the non-seismic precast model, and the least increase in ductility was observed in the conventional seismic reinforced concrete monolithic model. The effect of placing the minimum bending reinforcement at the bottom of the beam of these models was not noticeable and they showed the same seismic behavior as the original non-seismic precast models.