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Compressive Response of Cylindrical Concrete Columns Confined with Steel Spirals and GFRP Composites

Soltani, Hesam | 2011

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 42390 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Khalu, Alireza
  7. Abstract:
  8. Concrete structures require reinforcement and retrofitting because of possible mistakes in design or calculation, inconformity between plan and implementation, change in occupancy or applied loads, and decay. Development in technology, production of materials, and new methods play important roles in development of structure construction and reinforcement methods. Emerge of new materials creates great demand in studying, surveying, and determining design characteristic and criteria for these materials. One of these materials is FRP composite which is used in concrete structure reinforcement in different ways. In this laboratory research, the effect of external wrapping by GFRP composite together with internal restriction (steel spiral), on compressive performance of concrete, is surveyed. In this project, 22 cylindrical samples (10*20 cm) were made. Some samples were plain and without any lateral reinforcement and some were reinforced only with GFRP or steel spiral. The rest were reinforced with both GFRP and spiral. Dimensions and concrete compressive strength of all samples were equal, while variable parameters were number of GFRP layers and steel spiral pitch. Samples were axially compressed with Universal Testing Machine which apply axial load with constant rate of displacement and then applied load gained due to displacement of sample. Comparing obtained diagrams, it is shown that, compressive strength and ductility of samples are considerably increased by increase in confinement, either external form or internal form. In the end, with determination of participation rate of each parameter in increasing compressive strength and ductility, a model for predicting ultimate compressive strength and strain of sample is given
  9. Keywords:
  10. Compression Strength ; Ductility ; Confinement ; Glass Fiber Reinfoced Polymer (GFRP) ; Compression Strength

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