Question
Download Solution PDFThe maximum permissible eccentricity for no tension at the base of a gravity dam is
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFExplanation:
An elementary profile of a gravity dam is shown:
Let the resultant pass through any point at a distance e from the centre of CB. Hence ‘e’ is the eccentricity.
The components of R are shown as above.
For no tension at base,
σc ≥ 0
⇒ e ≤ b/6
Hence when the resultant force lies in the middle-one-third region, there is no tension anywhere at the base of the elementary profile of a gravity dam.
Important Points
- Gravity dam is made of concrete or masonry and resists the water force using the weight of the dam only.
- An elementary profile of a gravity dam is a triangular section having zero width at water level and maximum base width where hydrostatic pressure is maximum
- The resultant force R mainly comprises the water force and weight of the dam.
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