60 



40 



S- 

 u 3 30 



2 '5 



< 2 



- 



1 V 1 



1 



- 





- 



\ <& 











\ %■■ 









NT- 



\ s. 









xv 

 x% 











Note - Curves give upper limits that 



apply to anchors with a quasi-static 

 load of from to 20% of static capacity. 



1 I 









] 







10* 10* 10 3 10° 10' 



Number of Uniform Loading Cycles 

 Figure 6-7. Contours of cyclic loading without cyclic creep limits or number 

 and magnitude of loading cycles to prevent failure due to cyclic 

 creep (from Herrmann, unpublished). 



180 u 135" 90 u 45 u 45 u 90" 135 L 



Figure 6-8. Geographic distribution of earthquake epicenters (from Wilson, 1969). 



180*- 



56 



