Table 3 

 Crescent City Prototype Polos Study Tasks 



Task Area 



Task 



Description 



Prototype data collection Data collection 



Movement 

 Boundary conditions 



Physical model 



Impact 

 Waist ratio 



Stacking 



Critical size 



Fatigue 

 Reinforcement 



Design development Design procedure 



Physical model tool 

 verification 



Deterministic dolos 

 analyses 



Collect prototype dolos 

 strain and wave data 



Quantify both short and 

 long-term dolos movement 



Create database of boundary 

 conditions of instrumented 

 dolosse 



Construct and validate load 

 cell 



Quantify impact response 



Determine effect of changing 

 waist ratio on stress 



Determine effect of dolos 

 stacking depth on stress 



Determine critical dolos 

 size 



Determine fatigue in dolosse 



Determine reinforcement 

 requirements in dolosse 



Create dolos design 

 procedure 



29. Possibly the most significant event in CAU design development was 

 the acquisition of prototype dolos structural response data at Crescent City 

 (Howell 1988). The prototype data provided several startling revelations, 

 the most significant of which was the magnitude of the static stress levels, 

 both absolute and relative, to pulsating response (Melby and Howell 1989). 

 Previous FEM studies showed insignificant static stress levels for all but the 

 most unfavorable boundary condition scenarios. So prototype static stress 

 levels ranging from 100 psi* to 900 psi with a mean of 416 psi and a standard 



* A table of factors for converting non-SI units of measurement to SI 

 units is presented on page 4. 



16 



