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Poinçonnement des dalles bidirectionnelles en béton armé d'armature de polymères renforcés de fibres de verre
| Content Provider | Semantic Scholar |
|---|---|
| Author | Dulude, Christian |
| Copyright Year | 2011 |
| Abstract | In Quebec and in North-America, there is a common détérioration problem of the reinforced concrete structures in parking garages. The harsh environment surrounding those structures corrodes the steel rebars which is the principal cause of dégradation. However, this problem can be completely eliminated by the use of a non corroding material such as glass fiber-reinforced polymer (GFRP). This master's thesis présents an overview of the properties of fiber-reinforced polymer (FRJP) material and the standards related to their application. Also, the internai punching shear résistance mechanisms of two-way slabs are reviewed. This type of structure is widely used in parking garages. The results of eight two-way slabs reinforced with GFRP bars tested up to punching shear failure are presented in this master's thesis. Moreover, two reference slabs reinforced with steel have also been tested. The test parameters are : (i) the reinforcement type (GFRP or Steel) (ii) the slab thickness (iii) the column dimensions (iv) the reinforcement ratio and; (v) the presence of compressive reinforcement. The slab dimensions are 2.5 m x 2.5 m with a slab thickness of 200 or 350 mm. The results revealed that ail the specimens reinforced with GFRP bars showed a brittle failure similar to the reference specimens reinforced with steel. Furthermore, the GFRP specimens had a similar crack pattern and surface failure than the homologue reference specimens. However, the GFRP specimens showed a normalized punching shear strength of 67% in average of the reference specimens with the same reinforcement ratio. Those results are due to the lower modulus of elasticity of the GFRP bars which is about 25% of the steel. The ACI 440.1R-06 shows a very conservative ratio of the experimental results to the prédiction (Vc,exp/Vc,Pred) of 2.11 which lead to a none optimum and economical design of twoway slabs reinforced with FRP bars. However, the proposed équation in the next CSA-S806 standard shows good agreement with the experimental results with a ratio Vc>eXp/Vc,pred of 1.04 and a COV of 13%. Furthermore, the coefficient of détermination, R , of this équation is 0.95. The experimental results presented in this document have been used in the reconstruction of a parking garage in Quebec City. The Hôtel de ville parking garage is the first field application worldwide to use GFRP bars in a two-way slabs. Keyword: slab-column connection, two-way slab, flat slab, parking garage, punching shear capacity, FRP, glass, reinforced concrete. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | https://savoirs.usherbrooke.ca/bitstream/handle/11143/1604/MR83688.pdf?isAllowed=y&sequence=1 |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
