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What is the permissible tensile stress for high concrete gravity dam under worst conditions?

What is the permissible tensile stress for high concrete gravity dam under worst conditions? Correct Answer 500 kN/<span style="">m</span><span style=" line-height: 0; position: relative; vertical-align: baseline; top: -0.5em; font-size:10.5px;">2</span>

Explanation:

The following points should be remembered about gravity dam:

  1. The factor of safety against overturning generally varies between 2 to 3.
  2. The masonry and concrete gravity dams are usually designed in such a way that no tension is developed anywhere in the structure. The maximum permissible tensile stress for high gravity dams is taken as 500 kN/m2 under the worst conditions. If subjected to such tensile stresses crack develops near the heel.
  3. The allowable compressive stress of concrete is generally taken as 3000 kN/m2.
  4. The resultant of all forces must lie within the middle third of the joint width of dam to ensure no tension is developed. 

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