tài liệu về sức chịu tải của cọc trong công trình biển( GRLWeap-Wave Equation)_P2

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19-1 An unreinforced concrete pipe has a wall
thickness of t = 3 inches, ID = 36 inches, and length
of L = 11 ft. A 12-kip dual-wheel load passes over
midspan. Soil cover is negligible. What is the water
pressure inside the pipe at failure if the soil has been
washed out from around the pipe leaving it simply
supported on the ends? The joints are gasketed.
Unit weight of concrete is 144 pcf, unit weight of
water is 62.4 pcf, and strengths of the concrete are
2 ksi in tension and 12 ksi in compression.
19-2 What is the maximum tangential stress in a
thick-wall, closed-end cylinder that has a small tap
in it, if OD = 1.4(ID)?
19-3 A polyethylene pipe is to be installed under a
river. A tunnel, slightly larger than the pipe, is
directionally drilled under the river and driller's mud
is left in the tunnel to prevent collapse of the tunnel
until the pipe can be pulled through. As the pipe is
being pulled into place, the driller's mud is replaced
by grout. What is the maximum stress in the wall of
a polyethylene pipe subjected to the external
hydrostatic pressure of grout with unit weight 95 pcf,
and depth of 80 ft? The pipe is empty such that
pressure inside is atmospheric.DR = 9.5 = OD/t for this thick-wall pipe. Neglect
longitudinal force during the pull
(s t = 280 psi)