Abstract
The ductility and capacity of reinforced concrete beam-column connections depend mainly on the concrete’s strength and the provided reinforcements. This study investigates numerically the role of low-strength concrete in beam-column joints utilizing ABAQUS software. In this simulation, a newly developed stress-inelastic strain relationship for both confined and unconfined low-strength concrete is used. This study recommended a specific value of the concrete dilation angle for both substandard and standard joints. Also, stirrups’ yield strength value was found to play an insignificant role in improving the shear resistance of such joints with low-strength. In addition, the joint shear strength prediction using empirical models that implicitly consider the stirrups contribution in improving joint resistance was found to be better than the prediction of other models that explicitly consider the stirrups’ presence. The numerical results also showed that the use of a diagonal steel haunch as a joint retrofitting technique significantly increases the joint shear capacity and changes its brittle shear failure into a ductile beam flexural failure.
Highlights
Many catastrophic collapses of reinforced concrete (RC) buildings have been recorded in different corners of the world [1]
Different models based empirical or analytical assumptions the joints for to equilibrium are found to be on the main governing illustrated in Fig- were were established predict the shear resistance ofempirical beam-column jointsas
Stated that the unreinforced joints shear strength is directly related to the ( f c ) up to a specific upper limit
Summary
Many catastrophic collapses of reinforced concrete (RC) buildings have been recorded in different corners of the world (as reported by Adam et al.) [1]. Different models based empirical or analytical assumptions the joints for to equilibrium are found to be on the main governing illustrated in Fig- were were established predict the shear resistance ofempirical beam-column jointsas [4–7]. Is the main governing parameter in determining the unreinforced joint shear resistance as the developed diagonal compressive strut is carried alone by the concrete [7]. Stated that the unreinforced joints shear strength is directly related to the ( f c ) up to a specific upper limit They observed that joints with smaller ( f c ) strengths require less confinement and developed their maximum resistance at smaller strains compared to those with higher concrete compressive strengths. Khan et al [17] observed some debonding problems in the case of retrofitting joints with FRP This numerical study aims to assess the behavior of exterior beam-column connections with low-strength concrete.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
