Question

The best design of an arch dam is when?

1. All horizontal water loads are transferred horizontal to the abutments
2. The dam is safe against sliding at various levels
3. The load is divided between the arches and cantilevers and the deflections at the conjugal points being equal.
4. The deflections of the cantilevers are equal at different points.

Answer 1

Correct Answer - Option 3 : The load is divided between the arches and cantilevers and the deflections at the conjugal points being equal.

Concept:

Arch Dam:

• An arch dam should be constructed of concrete that meets the design criteria for strength, durability, permeability, and other required properties.
• Because of the sustained loading generally associated with them, the concrete properties used for the analyses of static loading conditions should include the effects of creep.

Explanation:

(i) In the trial load method, deflections for the arches are calculated at the points where the cantilevers cross it in each trial.

(ii) If the deflection calculated at these points from cantilever elements is within reasonable limits and same, then the assumed distribution of load is correct. If not, then the calculations are repeated using a different set of load distribution until the condition is satisfied.