Pile Design and Construction Practice, Fifth edition

Table 8.4 Calculations for current and wave forces in Example 8.3
Elevation Average Pile Current Wave drag Wave inertia Total Horizontal Bending moment
(m) (CD) height diameter
Velocity Force (u/C) 2 force load on (kNm)
above sea (m)
Force Force
(m/s) (kN/m2 ) (kN/m2 ) (kN/m2 (kN/m
)
2 z
h
1 ) element
g
·
bed (m) (kN)
du
dt
�7.5 – �5.5 13 0.610 1.2 0.36 1.18 0.21 9.01 0.26 2.54 11.91 14.53 �14.5 � 210.69
�5.5 – �3.5 11 0.610 0.8 0.16 1.00 0.18 7.72 0.21 2.05 9.93 12.15 �12.5 � 151.87
�3.5 – �1.5 9 0.680 0.6 0.09 0.82 0.15 6.43 0.17 1.85 8.37 11.38 �10.5 � 119.49
�1.5 – �0.5 7 0.680 0.4 0.04 0.64 0.13 5.58 0.14 1.52 7.14 9.71 �8.5 � 82.53
�0.5 – �2.5 5 0.680 0.3 0.02 0.45 0.12 5.15 0.12 1.31 6.48 8.81 �6.5 � 57.25
�2.5 – �4.5 3 0.800 0.25 0.01 0.27 0.11 4.72 0.11 1.41 6.14 9.82 �4.5 � 44.19
�4.5 – �6.5 1 0.800 0.25 0.01 0.09 0.11 4.72 0.11 1.41 6.14 9.82 �2.5 � 24.55
Maximum bending moment (at �6.5 m) in kN m � 690.57