Comparative Study Of Steel And Afrp Tendons With Optimized Pre Stressing Force For Scpc Joints

The Seismic Resilience Of Self-Centering Prestressed Concrete (SCPC) Joints Reinforced By Steel Tendons And The Novel Aramid Fiber Reinforced Polymer (AFRP) Tendons Under Cyclic Loading Settings Is Investigated In This Thesis Comprehensively. The Main Goal Is To Assess And Improve The Structural Behavior Of These Joints So As To Increase Their Seismic Resilience And Enable Quick Post-Earthquake Recovery. Using The Advanced Finite Element Program Abaqus, Extensive Numerical Simulations Were Carried Out Allowing A Detailed Comparison Of The Load-Displacement Response, Dissipating Energy Capabilities, As Well As Residual Deformations Of SCPC Joints Reinforced With Steel Tendons And AFRP Tendons, Accordingly. The Results Exposed Clear Behavioural Variations Between The Two Tendon Materials. The Inherent Qualities Of Steel Caused SCPC Joints With Steel Tendons Great Initial Stiffness. Once Yield Was Reached, The Steel Tendons Experienced Plastic Deformation, Which Greatly Helped To Dissipate Energy But Left The Joints Vulnerable To Persistent Residual Displacements Following Unload. This Residual Deformation May Call For Large-Scale Post-Quake Repairs, So Impeding Quick Recovery Attempts. By Contrast, Even At Higher Load Levels, SCPC Joints Reinforced With AFRP Tendons Showed Similar Initial Stiffness To Steel Tendon Joints But Retained Elastic Behavior Throughout The Loading Cycles. With Low Residual Displacement Seen Upon Unloading, This Elastic Response Allowed The AFRP Tendon Joints To Show Exceptional Self-Centering Capacity. But The Lack Of Plastic Deformation In AFRP Tendons Produced Reduced Energy Dissipation When Compared To Their Steel Counterparts, Which Emphasizes The Need Of Optimizing. Extensive Parametric Investigations Were Carried Out To Investigate The Effects Of Different Prestressing Forces And Damper Dimensions On The Performance Of AFRP Tendon Joints In Order To Overcome This Constraint. Although With A Risk Of Tendon Rupture At Too High Stress Levels, The Results Showed That Increasing The Prestressing Force Enhanced Initial Stiffness And Self-Centering Ability. Conversely, Changing The Width Of The Damper Leg Turned Out To Be A More Successful Approach For Improving Energy Iv Dissipation While Keeping Self-Centering Performance. The Ideal Damper Leg Width Was Found To Be In The Range Of 20–21 Mm, So Balancing Energy Absorption With Maintaining The Self-Centering Capacity Of The AFRP Tendon Joints. The Results Of This Study Greatly Help To Clarify SCPC Joint Behavior Under Seismic Load And Offer Important New Perspectives On The Possible Use Of AFRP Tendons As A Promising Substitute For Conventional Steel Tendons. The Improved Design Suggestions Resulting From This Research Can Help To Enable The More General Acceptance Of SCPC Technology In Building, So Encouraging The Creation Of More Resilient Built Environments In Areas Of Seismic Activity All Around.