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The upward acceleration of dam due to seismic activity will ________________________

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in Irrigation Engineering by (75.2k points)
The upward acceleration of dam due to seismic activity will ________________________

(a) increase the base pressure

(b) decrease the base pressure

(c) not affect the effective weight of the dam

(d) increase the horizontal dynamic force

I got this question in a job interview.

I'd like to ask this question from Gravity Dam Design in portion Gravity Dam Design and Construction of Irrigation Engineering

1 Answer

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by (106k points)
Right answer is (a) increase the base pressure

For explanation I would say: Vertical acceleration can be resolved in two parts i.e. upward vertical accelerations and downward vertical accelerations. The effective weight of the dam increases when there is an upward vertical acceleration as it brings the foundation closer to the dam. In downward acceleration, the effective weight reduces and is considered as the worst design case.

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