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Seismic behavior of Moment Resisting Steel Beam-Precast Reinforced Concrete Column Connections

Bakhtiari Doost, Roohollah | 2018

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  1. Type of Document: Ph.D. Dissertation
  2. Language: Farsi
  3. Document No: 51092 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Khaloo, Alireza
  7. Abstract:
  8. In the last decades, noticeable experimental and analytical investigations have been carried out on cast-in-place Reinforced Concrete column to Steel beam (RCS) connections, however rarely have been conducted on the precast RCS. In this reaserch, test results of five half-scale interior precast RCS connections with variable joint configurations are presented. The steel beams were connected to the precast column, using face bearing plates, embedded in the connection zone. The flanges of beams were strengthened with respect to scaled section, in order to increase the load transfer to the joint. All samples were loaded under reversed displacement controlled condition. The failure mode, joint distortion, lateral load capacity, stiffness retention, stiffness degradation, energy dissipation capacity, shear strength of panel zone, and strain at longitudinal and lateral reinforcement and continuity plate based on strain gauges results were evaluated. Presence of shear keys in the joint enhances strength and stiffness of subassemblies and reduces joint distortion. Utilization of extended cover plates considerably reduces shear distortion and rigid body rotation and also significantly increases shear resistance of the joint. Presence of steel web panel in connection zone noticeably increases shear resistance of the joint and reduces shear distortion and rigid body rotation. Also, nonlinear finite element analysis (push over analysis) was employed using ABAQUS 6.11.1 structural analysis software to investigate the behavior of proposed moment resisting precast precast RCS connections under monotonic loads. The result of finite element analysis under monotonic load was verified with experimental results based on failure mode, stiffness, and shear strength of panel zone. Based on the results of nonlinear finite element analysis, the analytical behavior of samples was in good agreement with experimental results and finite element analysis of proposed precast connection could be replaced with supplementary tests. The amount of connection zone rebar, column axial load, width and height of the face bearing plate were some of the parameters evaluated using the PRCS1 numerical model, which increased the width of the face bearing plate significantly increased shear strength of the connection zone. The ultimate shear strength of PRCS4 was also evaluated by constructing a numerical model, indicating the confinement has a significant influence on the shear strength of the connection zone. Based on overall investigation, proper seismic design connection details of precast RCS is proposed. Also, by constructing a full-scale numerical model, the shear strength of the connection zone has been evaluated, which indicates the reliability of the results of the samples at a scale of 50%
  9. Keywords:
  10. Nonlinear Finite Element Analysis ; Reinforced Concrete Column to Steel Beam (RCS)Connection ; Precast Structures ; Precast Reinforced Concrete Column to Steel Beam (RCS) Connections ; Joint Shear Resistance

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