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EN 1992-1-1:2004
9.3.1.4 Reinforcement at the free edges
(1) Along a free (unsupported) edge, a slab should normally contain longitudinal and transverse
reinforcement, generally arranged as shown in Figure 9.8.
(2) The normal reinforcement provided for a slab may act as edge reinforcement.
reinforcement is applied at the free (unsupported) edges of a slab to provide additional support and prevent cracking or failure.
from chatGPT
In structural engineering, reinforcement is often applied at free edges to improve the strength and durability of the structure. This is necessary because free edges are susceptible to stress concentrations, which can cause cracking, deformation, or failure of the structure over time.
The reasons for applying reinforcement at the free edges can include:
1. To prevent cracking: Free edges can experience high stress concentrations, especially in areas where loads are applied. The application of reinforcement can help distribute these stresses more evenly, reducing the likelihood of cracking or failure.
2. To improve durability: Reinforcement can help prevent deterioration of the structure over time due to factors such as weathering, chemical exposure, or cyclic loading.
3. To increase strength: By providing additional support, reinforcement can increase the strength of the structure, allowing it to resist higher loads and forces.
EN 1992-1-1 (Eurocode 2) provides guidelines for the design and construction of concrete structures, including the application of reinforcement at free edges. Section 9.3.1.4 of the code specifies that reinforcement should be provided at free edges to prevent cracking, improve durability, and increase strength. The specific requirements for reinforcement will depend on the type of structure, the loads it will be subjected to, and other factors.
from chatGPT
The reasons for applying reinforcement at the free edges in Eurocode 2 (EN 1992-1-1) are to prevent cracking, improve durability, and increase the strength of the structure.
Free edges are areas of a structure that are not supported by adjacent components or elements, and are therefore more susceptible to stress concentrations. These stress concentrations can lead to cracking, which can compromise the durability and structural integrity of the element over time.
By applying reinforcement at free edges, the stresses can be more evenly distributed throughout the structure, reducing the likelihood of cracking and improving its overall strength and durability. Reinforcement can take various forms, such as additional structural elements, changes in material thickness or composition, or the application of coatings or protective layers.
Eurocode 2 provides guidelines for the design and construction of concrete structures, including the application of reinforcement at free edges. Section 9.3.1.4 of the code specifies that reinforcement should be provided at free edges to prevent cracking, improve durability, and increase strength. The specific requirements for reinforcement will depend on the type of structure, the loads it will be subjected to, and other factors.
KDS 24 14 21 콘크리트교 설계기준(한계상태설계법)
4.6.3.1 휨철근
(4) 자유단 모서리 철근
① 지지되지 않은 슬래브 자유단 모서리에는 축방향 철근과 횡방향 철근을 배치하여야 하며, 일반적으로 그림 4.6-8과 같이 배치한다.
② 슬래브에 배치된 정상적인 철근은 모서리 철근의 역할을 한다.
균열을 방지하고 내구성을 개선하며 강도를 높이기 위해 자유 모서리에 보강재를 배치한다.
국부 하중을 분산시켜 허용할 수 없는 균열을 방지할 수 있습니다.
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