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Publication Number:  FHWA-HRT-14-067    Date:  September 2014
Publication Number: FHWA-HRT-14-067
Date: September 2014

 

Dynamic Properties of Stay Cables on The Penobscot Narrows Bridge

APPENDIX D. DAMPING PLOTS

This graph shows the first mode damping ratios from phase 1 testing of the cables in fan A. They are plotted with a 90 percent confidence interval on the mean. The cables range from 20A to 12A. The lowest mean is around 0.12 percent, while the highest mean is around 0.39 percent.
Figure 66. Graph. Phase 1, first mode 90 percent confidence interval on the mean, fan A.

This graph shows the first mode damping ratios from phase 1 testing of the cables in fan C. They are plotted with a 90 percent confidence interval on the mean. The cables range from 20C to 17C. The lowest mean is around 0.10 percent, while the highest mean is around 0.15 percent.
Figure 67. Graph. Phase 1, first mode 90 percent confidence interval on the mean, fan C.

This graph shows the second mode damping ratios from phase 1 testing of the cables in fan A. They are plotted with a 90 percent confidence interval on the mean. The cables range from 20A to 12A. The lowest mean is around 0.17 percent, while the highest mean is around 0.46 percent.
Figure 68. Graph. Phase 1, second mode 90 percent confidence interval on the mean, fan A.

This graph shows the second mode damping ratios from phase 1 testing of the cables in fan C. They are plotted with a 90 percent confidence interval on the mean. The cables range from 20C to 17C. The lowest mean is around 0.19 percent, while the highest mean is around 0.36 percent.
Figure 69. Graph. Phase 1, second mode 90 percent confidence interval on the mean, fan C.

This graph shows the first mode damping ratios from phase 2 testing of the cables in fan A. They are plotted with a 90 percent confidence interval on the mean. The cables range from 20A to 12A. The lowest mean is around 1.45 percent, while the highest mean is around 2.14 percent.
Figure 70. Graph. Phase 2, first mode 90 percent confidence interval on the mean, fan A.

This graph shows the first mode damping ratios from phase 2 testing of the cables in fan B. They are plotted with a 90 percent confidence interval on the mean. The cables range from 20B to 15B. The lowest mean is around 1.22 percent, while the highest mean is around 1.80 percent.
Figure 71. Graph. Phase 2, first mode 90 percent confidence interval on the mean, fan B.

This graph shows the first mode damping ratios from phase 2 testing of the cables in fan C. They are plotted with a 90 percent confidence interval on the mean. The cables range from 20C to 14C. The lowest mean is around 1.41 percent, while the highest mean is around 2.10 percent.
Figure 72. Graph. Phase 2, first mode 90 percent confidence interval on the mean, fan C.

This graph shows the first mode damping ratios from phase 2 testing of the cables in fan D. They are plotted with a 90 percent confidence interval on the mean. The cables range from 20D to 13D. The lowest mean is around 1.28 percent, while the highest mean is around 2.21 percent.
Figure 73. Graph. Phase 2, first mode 90 percent confidence interval on the mean, fan C.

This graph shows the second mode damping ratios from phase 2 testing of the cables in fan A. They are plotted with a 90 percent confidence interval on the mean. The cables range from 20A to 12A. The lowest mean is around 1.51 percent, while the highest mean is around 2.43 percent.
Figure 74. Graph. Phase 2, second mode 90 percent confidence interval on the mean, fan A.

This graph shows the second mode damping ratios from phase 2 testing of the cables in fan B. They are plotted with a 90 percent confidence interval on the mean. The cables range from 20B to 15B. The lowest mean is around 1.41 percent, while the highest mean is around 2.31 percent.
Figure 75. Graph. Phase 2, second mode 90 percent confidence interval on the mean, fan B.

This graph shows the second mode damping ratios from phase 2 testing of the cables in fan C. They are plotted with a 90 percent confidence interval on the mean. The cables range from 20C to 14C. The lowest mean is around 1.66 percent, while the highest mean is around 2.27 percent.
Figure 76. Graph. Phase 2, second mode 90 percent confidence interval on the mean, fan C.

This graph shows the second mode damping ratios from phase 2 testing of the cables in fan D. They are plotted with a 90 percent confidence interval on the mean. The cables range from 20D to 13D. The lowest mean is around 1.58 percent, while the highest mean is around 2.48 percent.
Figure 77. Graph. Phase 2, second mode 90 percent confidence interval on the mean, fan D.

 

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