کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4919737 | 1429075 | 2017 | 13 صفحه PDF | دانلود رایگان |
- Nine different reinforced concrete half-joint scenarios are tested.
- For studied specimens the impact of the concrete strength was negligible.
- A local reduction at the inner nib resulted in a 35% reduction in failure load.
- Two methods for mimicking corrosion cracking of concrete were implemented.
- Whereas individual deficiencies had little effect, synergistic effects were noted.
Half-joint beams, also referred to as dapped-end beams, have been the subject of several studies, primarily focussing on the design optimisation of new reinforced concrete beams and bridge decks. Existing half-joint structures, however, often show signs of deterioration and can exhibit improper reinforcement detailing. In order to gain a better insight into the impact of local corrosion, anchorage cracking, limited amounts of provided shear reinforcement, and improper reinforcement detailing, a test program was designed. Full-scale tests on nine half-joint beams were performed.The results of the study show that even though the impact of an individual shortcoming on the load carrying capacity of reinforced concrete half-joint beams might not be substantial, inspectors and assessors should pay attention to the possibility of combined effects. When multiple deterioration processes are noted and/or questions are raised with respect to the reinforcement detailing, the impact on the load carrying capacity of the beam might be larger than the linear combination of the individual effects.
Journal: Engineering Structures - Volume 152, 1 December 2017, Pages 865-877