(above 60 psi) were less than 0.010 sec In duration. 



37. A typical shock pressure time-history is presented in Figure 13. 

 This particular record was collected on Channel 1 (see Figure 5b) during sim- 

 ulation of the hurricane at a +9.5-ft swl. The peak value measured 105 psi 

 with a duration of approximately 0.038 sec above 10 psi. 



PT147X1 CHI 



0.6 0.8 



TIME, SEC 



Figure 13. Time-history depicting typical shock pressure 



38. At swl's of +8.0 and +9.5 ft NGVD, maximum pressures consistently 

 occurred at Channel 1 which was located near the vertex of the wall curvature. 

 High pressures also were common on the face of the highest step (Channel 3) at 

 these swl's. At the +7.0-ft swl, maximum pressures occurred on the faces of 

 the lower steps (Channels 4, 5, and 6). It is interesting that at no time 

 during data collection did the pressure on Channel 2 exceed 14 psi. Maximum 

 pressures at this location on the wall never displayed characteristics of 

 shock pressures. Instead, they were typified by a well-rounded, relatively 

 small peak of long duration (Figure 14) . 



39. Plates 1-63 were prepared to provide designers with adequate infor- 

 mation concerning pressure profiles in response to severe wave conditions. 



For each location of a pressure transducer, records containing the five great- 

 est pressures encountered were retrieved and analyzed in greater detail. Six 



31 



