SEISMIC ASSESSMENT OF CONCRETE BEAM–COLUMN CONNECTION STRENGTHENED WITH CARBON FIBER REINFORCED POLYMER

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BANIASAD JASEM; NASERI HAMID REZA; KHATIBINIA MOHSEN

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Journal: Modares Civil Engineering journal Year:2017 | Volume:17 | Issue:2 Page(s): 45-53

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Title

SEISMIC ASSESSMENT OF CONCRETE BEAM–COLUMN CONNECTION STRENGTHENED WITH CARBON FIBER REINFORCED POLYMER

Author(s)

BANIASAD JASEM | NASERI HAMID REZA | KHATIBINIA MOHSEN | Issue Writer Certificate

Keywords

BEAM–COLUMN CONNECTIONQ1

STRENGTHENING CONNECTIONQ1

CARBON FIBER REINFORCED POLIMERQ1

IMPROVEMENT OF SEISMIC PERFORMANCEQ1

Abstract

In the design process of a moment resisting frame (MRF), the principle of weak–beam and strong–column should been considered because of the occurrence of plastic hinge in the beams. This mechanism is caused because the frame is capable of dissipating significant energy and remaining stable in the inelastic region. Stability is defined as the ability of the frame to maintain its elastic level of resistance throughout the entire inelastic range of response. Using this principle, plastic hinges can be developed in the beams adjacent to the connections and usually very close to the column face. This mechanism allows the cracks to be caused by the plastic hinging. The cracks can also propagate into the connection core region, and initiate a brittle failure mechanism. Furthermore, the mechanism has not been established in many existing MRFs - designed based on the previous codes. Hence, the methods have been proposed and developed in order to relocate the plastic hinges away from the column face. Fiber Reinforced Polymer (FRP) has been used as a strengthening solution of BEAM–COLUMN CONNECTIONs and successfully reported for retrofitting existing structures. In fact, the web–bonded FRP retrofitting system can control the mechanism of plastic hinge and provide the strong–column weak–beam concept. Due to many advantages, such as high strength, low weight, endurance and convenience, Carbon Fiber–Reinforced Polimers (CFRPs) have been used in strengthening concrete structures. However, the strength and stiffness of CFRP are severely reduced at elevated temperatures, which will affect the strengthening effect seriously. In this study, six schemes are proposed for strengthening concrete BEAM–COLUMN CONNECTIONs using CFRP and the seismic performance of strengthened connections is investigated. In order to achieve this purpose, seven downscaled RC exterior joint of a typical ordinary MRF are chosen, and modeling this strengthened connection is implemented in a general finite element program, ABAQUS software. In the finite element model of strengthened concrete BEAM–COLUMN CONNECTION, the concrete is modeled using the damaged plastic model. The sheets of CFRP are also considered as the elastic and orthotropic model. These schemes of strengthened concrete BEAM–COLUMN CONNECTIONs are tested under moderately monotonic/cyclic loads. In order to verify the finite element model of the connection, the analysis results of this model is compared with the experimental investigation on the external BEAM–COLUMN CONNECTION repaired using CFRP. The results demonstrate the verification of the finite element model. Selection of the best scheme of strengthened concrete BEAM–COLUMN CONNECTION using CFRP is based on the improvement of the seismic performance of connection such as the load–carrying capacity, the energy absorption, the initial stiffness and changing failure mechanism of connection. The nonlinear results show that the proper layout of CFRP sheets can increase the load–carrying capacity, the energy absorption and the initial stiffness of connections. Furthermore, the proposed schemes of strengthened concrete BEAM–COLUMN CONNECTION cause the failure to relocate from the column face and locate in beam. Therefore, the best proposed scheme of strengthened concrete BEAM–COLUMN CONNECTION using CFRP can be recommended and utilized in the practical projects of concrete structures.

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APA: Copy

BANIASAD, JASEM, NASERI, HAMID REZA, & KHATIBINIA, MOHSEN. (2017). SEISMIC ASSESSMENT OF CONCRETE BEAM–COLUMN CONNECTION STRENGTHENED WITH CARBON FIBER REINFORCED POLYMER. MODARES CIVIL ENGINEERING JOURNAL, 17(2 ), 45-53. SID. https://sid.ir/paper/256804/en

Vancouver: Copy

BANIASAD JASEM, NASERI HAMID REZA, KHATIBINIA MOHSEN. SEISMIC ASSESSMENT OF CONCRETE BEAM–COLUMN CONNECTION STRENGTHENED WITH CARBON FIBER REINFORCED POLYMER. MODARES CIVIL ENGINEERING JOURNAL[Internet]. 2017;17(2 ):45-53. Available from: https://sid.ir/paper/256804/en

IEEE: Copy

JASEM BANIASAD, HAMID REZA NASERI, and MOHSEN KHATIBINIA, “SEISMIC ASSESSMENT OF CONCRETE BEAM–COLUMN CONNECTION STRENGTHENED WITH CARBON FIBER REINFORCED POLYMER,” MODARES CIVIL ENGINEERING JOURNAL, vol. 17, no. 2 , pp. 45–53, 2017, [Online]. Available: https://sid.ir/paper/256804/en

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