The connection detail tentatively proposed for the East Bay Marina, 

 Olympia Harbor, Washington, consists of the square rubber bumper similar to 

 that used at Sitka, Alaska, except the rubber unit serves as both a bumper and 

 a tension restraint. The unit is designed so that steel plates bolted to the 

 concrete modules penetrate the hole in the center of the rubber unit on each 

 side and restrain the modules from moving apart. During compression, the 

 rubber bumper absorbs forces and energy (Fig. 54). 



LTS 18 LONG 



PLAN 



L jr. I 



T_L 



<t> ANCHOR BOLTS I8"L0NG 



SECT I ON B -B_ 



Figure 54. Tentative connection design of a rubber unit which serves 

 as a bumper in compression and a restraining unit in ten- 

 sion (after U.S. Army Engineer District, Seattle, 1979). 



f . Anchoring Systems. 



(1) Anchors. The type of anchoring system designed for a particular 

 location depends to a large extent on the type of bottom material at that spe- 

 cific site. Conventional ship-type anchors are available in used condition in 

 the 6,000- to 8,000-pound range, but their holding power under actual site 

 conditions has not been field tested. Pile anchors are quite effective if 

 penetration is sufficient to develop adequate shear and bending strength of 



93 



