|
Strengthening of RC Beams subjected to cyclic load Using Ultra High-Performance Strain Hardening Cementitious Composites |
|---|---|
| รหัสดีโอไอ | |
| Title | Strengthening of RC Beams subjected to cyclic load Using Ultra High-Performance Strain Hardening Cementitious Composites |
| Creator | Abd El-Hakim Khalil, Emad Etman, Ahmed Atta, Mohamed Essam |
| Publisher | ISEC PRESS |
| Publication Year | 2560 |
| Keyword | RC beams, Strengthening, Cyclic load, Dissipated energy |
| Abstract | Ultra High Performance Strain Hardening Cementitious Composites (UHP-SHCC) are a composite material comprising a cement-based matrix and short fibers with outstanding mechanical and protective performance which having large advantages on large strain capacity as well as high compressive and tensile strength, which is useful for strengthening or repair concrete members. An important obstacle needs to be studied, is the strain localization occurs in the UHP-SHCC strengthening layer around the substrate concrete cracks, which severely limits the ductility of the strengthened beam. Another important study is the low cycle fatigue response due to the effect of short time repeated loading subjected to structures. In the present study, Five specimens were tested experimentally, one as a control and four strengthened with variable reinforcement ratios embedded in the strengthening layer which attached to the soffit part of the beam. Cyclic loading was applied to all specimens. The recorded tests showed that it is sufficient to use 1.2% additional reinforcement ratio embedded in the strengthening layer for beams strengthened with UHP-SHCC to eliminate the observed early strain localization and to gain adequate dissipated energy under cyclic loading. Another important conclusion is the strengthening of RC structures using an unreinforced UHP-SHCC layer may lead to a brittle failure especially in case of cyclic load. |
| ISBN | 978-0-9960437-4-8 |
