Note : x,y and z axes ore 

 orthogonal 



///////// //////'////////////////////////////////////////// 



Figure 1-62. Definition Sketch - Calculation of Wave Forces on 

 a Nonvertical Pile 



FIND : The maximum force per unit length on the pile 30 ft. below the 

 SWL (z = -30 ft.). 



SOLUTION : For simplicity. Airy theory is used. From preceding examples, 

 C^ = 1.5, C^) = 0.7, and L = L^ = 554 feet. 



From Equation 7-18, with sin (-2TTt/T) = 1.0, 



f.m = ^M P?. 



ttD^ tt cosh [27r (d + z)/L] 



H 



cosh [27rd/L] 



■n (4)2 TT 



£.^ = 1.5 (2) (32.2) -y- (35) — - (0.8) = 193 Ibs./ft. 

 "" 4 554 



From Equation 7-19, with cos (27rt/T) = 1.0, 



'^Dm 



Dm 



Cr. — DH2 



4L2 



cosh [27r (d + z)/L]' 



(2) (32.2) 

 0.7 ^-'-'^—^ (4) (35)2 



cosh [27rd/L] 

 (32.2) (12)2 



(0.5) 



(4) (554)2 

 7-122 



(0.8)2 ^ 267lb./ft. 



