8. Design of Coastal Structures
273
ai = 0.6 + 0.5
2 x 0.272 x 6 \2
sinh2 x 0.272 x 6/
0.63
.
.6-4
Q2 = min'of3T6
1.8\2
—— ) = 0.0225 or
4 J
2x4
------ = 4.4
1.8
O!2 — 0.0225
= i _ 7~2-5 fi _
1
013
6
\
cosh(0.272 x 6)
pi = 0.5(1 + l)(0.63 + 0.0225 x 1) x 1 x 1.8 = 1.2 t/m2
1 - — Pi = 1 -
1.2 = 0.09 t/m2
p3 = 0.53 x 1.2 = 0.6 t/m2
Æ = |^c(Pl +P2) + ~(P1 +P3)(/iw - M
= ^2.5 x (1.2 + 0.1) + 1(1.2 + 0.6)(7 - 2.5) = 5.7 t/m
Z
Z
Horizontal forces estimated from,
Miche-Rundgren is 7.9 t/m and, Goda is 5.7 t/m
Solution
(i) Miche-Rundgren
No change -» Re = 7.9 t/m