INCREASING THE DUCTILITY OF BEAM-TO-COLUMN CONNECTIONS IN REINFORCED CONCRETE STRUCTURES USING DIAGONAL BARS AND PROVIDING A DAMAGE INDEX USING ARTIFICIAL INTELLIGENCE

Mohammad Mehran Azimifard Department of Civil Engineering, Semnan Branch, Islamic Azad University, Semnan, Iran, Email: Mehran.azimifard@gmail.com, 0000-0001-7979-2554
Alireza Mortezaei Seismic Geotechnical and High Performance Concrete Research Centre, Department of Civil Engineering, Semnan Branch, Islamic Azad University, Semnan, Iran, Correspondence Email: a.mortezaei@semnaniau.ac.ir, 0000-0001-6802-3661
Ali Hemmati Seismic Geotechnical and High Performance Concrete Research Centre Department of Civil Engineering, Semnan Branch, Islamic Azad University, Semnan, Iran, Email: Ali.hemmati@semnaniau.ac.ir, 0000-0003-4867-631X

Abstract

Beam-to-column connection is of particular importance because the connection dimensions are very small and the density of bar placement is extremely high due to negative moments and maximum shear forces and it causes execution problems in stirrup placement at the connection. This research investigates the behavior of concrete beam-to-column connection by replacing the existing stirrups in the beam-to-column connection with diagonal bars and changing the type of bend, size and number of diagonal reinforcements and its effects on the ductility of the connection relative to the connection with and without stirrup at the connection node. Analytical study was carried out using Abacus software and laboratory results as well as previous research. Based on the study and comparisons, the results obtained from the analytical method are relatively well consistent with the laboratory results. The results show that the the required ductility in the beam-to-column connection can be provided using diagonal bars and that changing the angle of diagonal bars is effective on the connection behavior. Therefore, in this study, a solution was proposed that is based on the decision tree and the support vector machine. This hybrid method is able to achieve a higher accuracy than either of these methods alone by combining these two methods. The proposed method was compared with the decision tree, SVM and Bayesian methods and it was observed that the proposed method is able to make predictions with much higher accuracy and lower computational overload

Keywords:

: Concrete beam-to-column connection, ductility, diagonal bars, hysteresis diagram


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References


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