U.S. Department of Transportation
Federal Highway Administration
1200 New Jersey Avenue, SE
Washington, DC 20590
202-366-4000

Skip to content
Facebook iconYouTube iconTwitter iconFlickr iconLinkedInInstagram

Federal Highway Administration Research and Technology
Coordinating, Developing, and Delivering Highway Transportation Innovations

 
REPORT
This report is an archived publication and may contain dated technical, contact, and link information
Back to Publication List        
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 B. MODE FREQUENCY PLOTS

This graph compares the first mode frequencies from both phase 1 and phase 2 testing. The x-axis represents the cable number, and ranges from 20 to 12. The y-axis represents frequency, and ranges from 0.6 to 1.2 Hertz. Fan A is represented by red triangles for phase 1 and red squares for phase 2 and its values range from 0.8 to 1.2 Hertz. Fan B is represented by green squares for phase 2 and its values range from 0.7 to 0.9 Hertz. Fan C is represented by purple triangles for phase 1 and purple squares for phase 2 and its values range from 0.7 to 0.9 Hertz. Fan D is represented by blue squares for phase 2 and its values range from 0.8 to 1.1 Hertz. Fans A and D are the side span fans and their frequencies match closely, while fans C and B are the main span fans and their frequencies also match. The respective fans also match closely across both phases.
Figure 59. Graph. Comparison of first mode frequencies.

This graph compares the second mode frequencies from both phase 1 and phase 2 testing. The x-axis represents the cable number, and ranges from 20 to 12. The y-axis represents frequency, and ranges from 1.2 to 2.4 Hertz. Fan A is represented by red triangles for phase 1 and red squares for phase 2 and its values range from 1.5 to 2.3 Hertz. Fan B is represented by green squares for phase 2 and its values range from 1.4 to 1.7 Hertz. Fan C is represented by purple triangles for phase 1 and purple squares for phase 2 and its values range from 1.4 to 1.8 Hertz. Fan D is represented by blue squares for phase 2 and its values range from 1.5 to 2.2 Hertz. Fans A and D are the side span fans and their frequencies match closely, while fans C and B are the main span fans and their frequencies also match. The respective fans also match closely across both phases.
Figure 60. Graph. Comparison of second mode frequencies.

This graph compares the third mode frequencies from both phase 1 and phase 2 testing. The x-axis represents the cable number, and ranges from 20 to 12. The y-axis represents frequency, and ranges from 2.0 to 3.6 Hertz. Fan A is represented by red triangles for phase 1 and red squares for phase 2 and its values range from 2.3 to 3.6 Hertz. Fan B is represented by green squares for phase 2 and its values range from 2.1 to 2.6 Hertz. Fan C is represented by purple triangles for phase 1 and purple squares for phase 2 and its values range from 2.1 to 2.7 Hertz. Fan D is represented by blue squares for phase 2 and its values range from 2.4 to 3.3 Hertz. Fans A and D are the side span fans and their frequencies match closely, while fans C and B are the main span fans and their frequencies also match. The respective fans also match closely across both phases.
Figure 61. Graph. Comparison of third mode frequencies.

This graph compares the fourth mode frequencies from both phase 1 and phase 2 testing. The x-axis represents the cable number, and ranges from 20 to 12. The y-axis represents frequency, and ranges from 2.4 to 4.8 Hertz. Fan A is represented by red triangles for phase 1 and red squares for phase 2 and its values range from 3.1 to 4.7 Hertz. Fan B is represented by green squares for phase 2 and its values range from 2.8 to 3.4 Hertz. Fan C is represented by purple triangles for phase 1 and purple squares for phase 2 and its values range from 2.8 to 3.6 Hertz. Fan D is represented by blue squares for phase 2 and its values range from 3.2 to 4.4 Hertz. Fans A and D are the side span fans and their frequencies match closely, while fans C and B are the main span fans and their frequencies also match. The respective fans also match closely across both phases.
Figure 62. Graph. Comparison of fourth mode frequencies.

This graph compares the fifth mode frequencies from both phase 1 and phase 2 testing. The x-axis represents the cable number, and ranges from 20 to 12. The y-axis represents frequency, and ranges from 3.2 to 6.0 Hertz. Fan A is represented by red triangles for phase 1 and red squares for phase 2 and its values range from 3.9 to 5.8 Hertz. Fan B is represented by green squares for phase 2 and its values range from 3.6 to 4.4 Hertz. Fan C is represented by purple triangles for phase 1 and purple squares for phase 2 and its values range from 3.6 to 4.6 Hertz. Fan D is represented by blue squares for phase 2 and its values range from 4.0 to 5.4 Hertz. Fans A and D are the side span fans and their frequencies match closely, while fans C and B are the main span fans and their frequencies also match. The respective fans also match closely across both phases.
Figure 63. Graph. Comparison of fifth mode frequencies.

This graph compares the sixth mode frequencies from both phase 1 and phase 2 testing. The x-axis represents the cable number, and ranges from 20 to 12. The y-axis represents frequency, and ranges from 4.0 to 7.2 Hertz. Fan A is represented by red triangles for phase 1 and red squares for phase 2 and its values range from 4.7 to 7.1 Hertz. Fan B is represented by green squares for phase 2 and its values range from 4.2 to 5.2 Hertz. Fan C is represented by purple triangles for phase 1 and purple squares for phase 2 and its values range from 4.2 to 5.5 Hertz. Fan D is represented by blue squares for phase 2 and its values range from 4.8 to 6.6 Hertz. Fans A and D are the side span fans and their frequencies match closely, while fans C and B are the main span fans and their frequencies also match. The respective fans also match closely across both phases.
Figure 64. Graph. Comparison of sixth mode frequencies.

This graph compares the seventh mode frequencies from both phase 1 and phase 2 testing. The x-axis represents the cable number, and ranges from 20 to 12. The y-axis represents frequency, and ranges from 4.8 to 8.4 Hertz. Fan A is represented by red triangles for phase 1 and red squares for phase 2 and its values range from 5.4 to 8.3 Hertz. Fan B is represented by green squares for phase 2 and its values range from 5.0 to 6.1 Hertz. Fan C is represented by purple triangles for phase 1 and purple squares for phase 2 and its values range from 5.0 to 6.5 Hertz. Fan D is represented by blue squares for phase 2 and its values range from 5.6 to 7.7 Hertz. Fans A and D are the side span fans and their frequencies match closely, while fans C and B are the main span fans and their frequencies also match. The respective fans also match closely across both phases.
Figure 65. Graph. Comparison of seventh mode frequencies.

 

Return to top

Privacy Policy | Freedom of Information Act (FOIA) | Accessibility | Web Policies & Notices | No Fear Act | Report Waste, Fraud and Abuse | U.S. DOT Home | USA.gov | WhiteHouse.gov

Federal Highway Administration | 1200 New Jersey Avenue, SE | Washington, DC 20590 | 202-366-4000
Turner-Fairbank Highway Research Center | 6300 Georgetown Pike | McLean, VA | 22101