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Coastal Engineering: Theory and Practice
Hence, F' = 0.968 x 101.7 = 98.44 kN/m
Calculation of moment,
From Fig. 8.6
= 0.44, —— —0.123
'yd3
'yd3
Mc = 118.8 kN/m
Mt = -33.2 kN/m
The maximum moment at which there is wave action on the leeward side
of the structure with Mc — Mt
Mnet = Mc — Mt = 152 kN-m
The combined moment due to both hydrostatic and wave loading is
found as,
10(3')3
^cÇtotai) = —g---- 1-118.8 = 163.8 kN-m/m
10('3')3
^t(totaZ) = —g---- F (-33.2) = 11.8 kN-m/m
M'c = 0.912 x 163.8 = 149.4 kN-m/m
Similarly for trough:
Ft = rfFt, Ml = rmMt
rf = 1.0 and rm = 1.0 under trough (as b/yt > 1, refer Eqs. (8.10) and
(8-12))
Fl = Ft, Ml = Mt which are calculated earlier respectively as 17.1 kN/m
and 11.8 kN-m/m.
Hence, F’ c = 98.5, M'c = 149.4 and Fl = 17.1, Ml = 11.8
Fnet = Fé ~ Ft ~ 81-4 kN/m
Mnet - Mc - Ml = 137.6 kN-m/m
A similar analysis for 10 sec wave gives,
Fnet = 85.2 kN/m
Mhet — 139 kN-m/m