198 COLLAPSE OF TEXAS TOWER NO. 4 



Senator Saltonstall. I have some further questions, but I will 

 wait for your interrogation. 



Senator Stennis. I was just going to suggest that we let counsel 

 finish his examination and then we would both proceed. 



Senator Saltonstall. All right. 



Senator Stennis. All right, Mr, French, 3'ou proceed. We will 

 allow you 20 minutes now, or such amount thereof as jow may need. 



Mr. French. Thank you, sir. 



CRITICISM or BREWER STUDY BY DESIGN ENGINEERS 



Mr. Brewer, in the design and construction report for the Texas 

 towers on page 64, there is a short paragraph that I would like to read 

 to you : 



During the fall of 1958 a subcontract was siven to the Brewer Engineering 

 Laboratories, Inc., to perform motion studies on the tower. These consisted of 

 horizontal acceleration measurements in the vicinity of each of the three legs 

 correlated with strain gage measurements on the legs and simultaneous observa- 

 tions of winds and wave direction and amplitude. These studies were not very 

 successful mostly because it was difficult to determine the true translations 

 which involved a multiple integration of the curves obtained from rather ir- 

 regular data. 



Would you kindly address yourself to the criticism that has been 

 expressed ? 



Mr. Brewer. "Wliere is that statement, sir? 



Mr. French. On page 64 of the Design and Construction Report for 

 Texas towers. 



Mr. Breaver. I guess we don't have a copy of that. I see. This 

 actually is a comment on our study by another party, and it says — 



These studies— 



which are our studies — 



were not very successful mostly because it was very difficult to determine the 

 true translations which involve the multiple integration of the curves obtained 

 from rather irregular data. 



I don't agree with that statement. I feel that our data were quite 

 comprehensive, and that they were accurate, and that it was success- 

 ful, and we have a number of plots in our reports that sliow the cor- 

 relation between the acceleration, the double integration accelerom- 

 eters with the strain gage information on the legs themselves, and 

 within the limits of experimental accuracy, these data showed a good 

 correlation. 



Mr. French has these reports and the plots that I refer to. 



Mr. French. Can you briefly tell us, sir, whether or not in your 

 report the platform excursions coincided with the striking of waves? 



Mr. Brewer. They did not. The tower was in motion continuously. 

 We have no records — every record we took, the tower was in motion. 



Now, we have simultaneous records of wave passages from the 

 wave staff, together with the tower motions, and they are in the back 

 of one of our reports, and if you examine the oscillograms, you will 

 see the wave passage going by, which appears just like a profile of a 

 ware, but you will notice that the tower motions continued after the 

 wave and they also preceded it ; that is, there is enough loading from 

 the waA^es going by so that the tower — and the tower has such little 

 damping that it is in a state of continuous motion. 



