Retrofit Of Beam-column Joints Research Articles

Study of structural behavior of retrofit beam column junction using Ansys

The beam-column joint is a critical component of reinforced concrete buildings, responsible for effectively transferring loads between connected members while withstanding gravity and seismic forces. However, these joints are often the weakest link in the structure due to insufficient shear strength. To ensure structural integrity, Carbon Fiber Reinforced Polymer (CFRP) materials are widely utilized for retrofitting beam-column joints. CFRP offers high strength, stiffness, and corrosion resistance without significantly increasing the joint's dimensions. ANSYS Workbench is a powerful software tool that enables detailed analysis and design of beam-column joints. By providing advanced simulation capabilities, it reduces the necessity for physical testing and streamlines the retrofitting process, thereby enhancing project efficiency and cost-effectiveness. This study focuses on the analysis and retrofitting of beam-column joints using CFRP materials in ANSYS Workbench, specifically in the 2022 R2 Student and 2022 R1 Teaching versions. The findings of this study reveal significant improvements in the retrofitted beam-column joints compared to their original condition. Notably, the use of CFRP wrapping reduces deformation and increases the maximum principal stress in various reinforcement patterns. The study also includes a comparison between manual and analytical results, further validating the effectiveness of the retrofitting approach using CFRP materials.

Behaviour of retrofitted beam column joints under Monotonic and Cyclic loading -A review

Retrofitting of beam-column joints is required when inadequate reinforcement detailing or improper construction techniques leads to inadequate behaviour of structures during the occurrence of earthquakes. Generally, for retrofitting of beam column joints, Fibre Reinforced Plastics (FRPs) have proven to be effective. Conventionally, Carbon, Glass and Kevlar FRPs are the most commonly used materials for retrofitting. Recently, Basalt FRP has emerged to be an equally viable option for retrofitting purposes. This review mainly discusses the seismic performance of beam to column joints retrofitted with the various techniques and methodologies that were experimented using FRP and the efficacies of the same in real world application. Retrofitting beam column joint using FRPs exhibited increased shear resilience of the joint, ductility and energy dissipation, damping ratios, mitigated the stiffness degradation of the joint and eliminated the brittle joint failure due to shear.

Retrofitting of Beam-Column Joints in RC Buildings using Jacketing Techniques along with Cross Bars- Review Paper

Retrofitting of Beam-Column Joints in RC Buildings using Jacketing Techniques along with Cross Bars- Review Paper

Assessment and Design Procedure for the Seismic Retrofit of Reinforced Concrete Beam-Column Joints using FRP Composite Materials

In this study, an analytical procedure for the evaluation of the expected performance of existing reinforced concrete (RC) beam-column joints before and after being retrofitted using fiber-reinforced polymer (FRP) composite materials is presented. Focus is given on the evaluation of the shear-strength versus deformation properties of the panel zone region either in the as-built or FRP-retrofitted configuration. Based on experimental and numerical evidence as well as on physical models representing the mechanics of the joint region, principal tensile stresses versus joint shear deformation relationships are adopted and preferred to more traditional nominal shear-strength rules, to evaluate, within a step-by-step iterative procedure, the combination of the joint shear contribution provided by the FRP composite material and that provided by the concrete core alone. The use of principal stresses allows one to directly account for the effects of variation of axial load, typically neglected in the assessment and retrofit of beam-column joints. The hierarchy of strength and sequence of events (damage mechanisms) expected within a beam-column subsystem are visualized via M-N interaction performance domains, used as a basis for a performance-based retrofit philosophy. Specific limit states or design objectives are targeted, with attention given to both strength and deformation limits. The proposed analytical procedure is validated on the results of a set of experimental tests available in the literature. With the intention to provide a simple design tool that can be easily implemented by practicing engineers, a worked example for the evaluation of the expected performance of an FRP retrofitted beam-column joint is provided and used as a basis for a parametric study to illustrate the effects of different strengthening schemes on the behavior of strengthened exterior joint panels under various axial load levels.