footings (such as that illustrated on Figure 2h) can be used to avoid 

 the problem. These footings are designed with rapidly corroding 

 connections such that after a period of several months the connection 

 is sufficiently weakened that a tension between the structure and the 

 individual footing will cause separation. This connection must be 

 designed to handle the full design compression and shear loads until 

 separation is effected. 



EXAMPLE PROBLEM 



The two example problems which follow are representative of actual 

 situations. The complete design procedures are presented to illustrate 

 the iterative process involved. During this process as various individ- 

 ual parameters are checked, found to be inadequate, and modified, it is 

 necessary to revalue other parameters which are interrelated. In the 

 example problems it may be noticed that revaluations for all inter- 

 related parameters are not always illustrated after each modification. 

 Where the resulting change would be small, the revaluing is omitted. 



Design Example One 



The first design example is an installation in deep water. The 

 structure is part of an experiment to measure ambient noise in the 

 deep ocean. It consists of a triangular platform supporting a 

 radioisotope power source, a bale of line and assorted equipment for 

 use in eventual recovery, several acoustic sensors, and five pressure- 

 resistant housings of various shapes and sizes containing data con- 

 ditioning, analysis, storage, and acoustic telemetry equipment. The 

 characteristics of the structure are as follows: 



= 10 feet 



max 



y =8.7 feet 

 max 



z = 6.5 feet 

 max 



A = 34.5 square feet 



A = 44 square feet 



z = 1.5 feet 



W = 6,200 pounds 



W = 3,600 pounds 

 sw 



17 



