Table 4. Offshore Towers and Platforr 



Name 



— 



™" 



No. of Structures 



Depth 

 (ft) 



L oca„on 



Foundation 

 Type 



Per Foundation 

 Member 



Foundation 

 Size 



Embedment 

 Depth 

 (ft) 



Sediment 



Bearing Capacity 

 (psf) 



Bernard 



*.»«„, 



»- 



1960 



> 



193 



27 miles south of 

 Bermuda 



Piles 





,„ur30-,,„am 



50 



denMcoral 





No .option problems. 



Khazzan Dubai 1 





1969 



' 



160 



near Dubai 

 Arabian Gulf 



footing and 





270-ft-diam 

 footing with 



90 







No foundation problems. 



NSRDL Towers 



NSRDL (Naval Ship 

 Research and Devel- 

 opment Laboratory) 



1957 



1 



100 

 60 



off west coast of 

 Florida 



piles 



760 ,000-lb capacity 

 540 ,000-lb capacity 



sixteen 30-in.-diam 

 eight 24-in.-diam 



60 

 70 



gray silty sand 

 blue-green 





No foundation problems. 

 No foundation problems. 



NE LC Tower 



NELC (Naval 

 Electronics Labora- 

 tory Center) 



1959 



' 



60 



Mission Bay near 

 San Diego 



Piles 



140 ,000-lb compression 

 115.000-lb tension 



four 12-3/4-in.- 



63 



medium to 





No foundation problems. 



Tekutel (Pile 

 Guide System) 



Navy, Department 

 of Interior, NASA, 

 General Electric 



1969 



' 



32 



Lameshor Bay, 

 Virgin Islands 



Piles 





four21-in.-diam 



refusal 



cpralsand 





Piles snapped off during 



Texas Towers 



«,^ 



1955 

 1956 



' 



55 

 55 

 180 



St. George's Bank 

 east of Cape Cod 



Nantucket Shoal 



75 miles 



southeast of 



New York Harbor 



caissons 



5.300 ,000-lb compression 



720 ,000-lb horizontal 



1 300,000 ft-lb 



7. 100.000-lb vertical 



1,1 00 ,000-lb horizontal 



33,000,000 ft-lb 



bending moment 



6,800 ,000-lb vertical 



820,000-lb horizontal 



negligible bending 



three 15-ft-diam 



three 14-ft-diam 

 three 12-1/2-ft- 



48 

 60 



tr 



»24,000at30-ft 



Destroyed by sea-action. 



