The dolos design can be optimized with respect to dolos shape, size, and 

 material characteristics within the computer program. 



22. This design methodology also includes design stress and hydro- 

 dynamic stability verification in the physical model. Thus, all of the primary 

 design requirements are met under this design procedure. 



CAU Structural Design Development History 



23. Major progress toward a complete CAU design procedure was not 

 achieved until very recently. Table 2 shows the history of recent CAU design 

 methods. Note that all of the innovations occurred since 1980. The most 

 significant milestones in CAU design development are shown in bold lettering 

 in this table. 



Table 2 

 Comprehensive CAU Design History 



Authors 



Date 



Burcharth 





1981 



Bur char th 





1981 



DHI 





1981 



Timco and Mansard 





1982 



Howell, ed. 





1985 



Scott et al. 





1986 



McDougal, Melby, and 



Tedesco 



1987 



Howell et al . 





1988 



Melby 





1989 



Howell, Rhee, and Rosati 



1990 



Markle and Greer 





1990 



Burcharth and Liu 





1990 



Burcharth and Melby 





Current 



Development 



Identified load types 



Prototype drop tests 



Instrumented small-scale CAU units 



Scaled CAU strength 



Two moments and a torque 



Load cell 



Dolos numerical model 



Prototype dolos measurements 



Dolos design procedure 



Pulsating distribution model 



Verified load cell for pulsating 



Verified load cell for static 



Parametric dolos study 



24. Progress toward a comprehensive CAU design procedure began in 

 earnest in the late 1970's and early 1980's. Burcharth (1981) identified the 

 primary CAU load types (Table 1) and proposed prototype drop tests to deter- 

 mine general dolos failure. The Danish Hydraulic Institute experimented 



14 



