An earthquake acceleration of 0.1 g acting vertically downward causes in a gravity dam
- Aan increase in the weight of dam by 10%
- Ba reduction in the unit weight of concrete only by 10%
- Ca decrease in the unit weights of concrete and water by 10%Correct
- Dincrease in the uplift pressure by 10%
Solution
Concept
Vertical earthquake acceleration
Step-by-step solution
1. Downward acceleration 0.1 g reduces the effective weights of concrete and water by 10%.
Explanation
The effective gravity is 0.9 g.
Why the other options are wrong
It does not increase weight or uplift.
Shortcut
Downward a: weight ↓.
Correct answer: C) a decrease in the unit weights of concrete and water by 10%