Loading...

Experimental Investigation on the Behavior of RC Arches Strengthened by GFRP and CFRP Composites

Moradi, Hossein | 2022

216 Viewed
  1. Type of Document: M.Sc. Thesis
  2. Language: English
  3. Document No: 54982 (53)
  4. University: Sharif University of Technology, International Campus, Kish Island
  5. Department: Science and Engineering
  6. Advisor(s): Khaloo, Alireza
  7. Abstract:
  8. The rehabilitation of old structures holds a lot of importance, as many structures with a life span of over 30 years are prone to severe damage and even collapse. To overcome this problem, the use of FRP sheets to strengthen structures is suggested. RC-arches have been used in many structures such as bridges and require specific consideration in terms of strengthening. So far, the influence of the number of FRP layers and location, the height of arch and percentage of reinforcement on strengthened arch behavior have not been investigated. In this research, reinforced concrete arch members strengthened with GFRP and CFRP were investigated. A total of 28 Specimens, including four un-strengthened (control) and 24 strengthened RC arches were tested under concentrated point load. The span length, width, and thickness of all specimens were 1100,300, and 100 millimeters, respectively. The variables of this study were type of FRP confinement, steel reinforcement ratio, height of the arch, number and orientation of FRP layers. Steel reinforcement was utilized as longitudinal reinforcement, and FRP layers were attached on intrados and extrados. Two variations were considered for the number of layers at each side. The influence of each parameter was evaluated using the results obtained from experiments. In the end, an analytical investigation was performed on the arches based on ACI-440. Test results indicate that specimens with lower heights show a better performance improvement through FRP retrofitting, and attaching fibers on extrados has more effect on strengthening the arches. Numerical ACI results were in agreement with experimental results, showing the capability of ACI code to predict the flexural and shear capacities of RC arches.However, for CFRP strengthened specimens, the most favorable specimens in terms of performance belonged to the arches with same number of layers at both sides, and in overall, GFRP strengthened specimens showed a significantly high performance and effectiveness to be considered as suitable confinement for RC-arches, rather than their CFRP confined counterparts. Based on the research results, GFRP strengthening provides better improvement than CFRP.
  9. Keywords:
  10. Reinforced Concrete Arch Structures ; Strengthening (Metal) ; Failure Modes ; Glass Fiber Reinfoced Polymer (GFRP) ; Carbon Fiber Reinforced Polymer (CFRP) ; Five-Hinge Mechanism ; Concrete Slabs

 Digital Object List

 Bookmark

No TOC