Question

The skin friction developed in San Francisco Oakland Bay Bridge, was reduced by, which of the following methods?

(a) By introducing special equipment

(b) By coating smooth oil surface

(c) By decreasing the stress developed

(d) All of the mentioned

This question was addressed to me in unit test.

Asked question is from Well Curb, Cutting Edge, Steining and Bottom Plug in division Well Foundations of Geotechnical Engineering II

Answer 1

Correct answer is (b) By coating smooth oil surface

The best explanation: In order to reduce the skin friction on the in San Francisco Oakland Bay Bridge, a coating which gave a smooth oily surface that was estimated to reduce the friction between the concrete and fairly clay by 40 %.