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APPENDIX A
Survey Questionnaire
NATIONAL COOPERATIVE HIGHWAY RESEARCH PROGRAM
SYNTHESIS TOPIC 35-07
INSPECTION AND MAINTENANCE OF BRIDGE STAY CABLE SYSTEMS
QUESTIONNAIRE
With this request for information, we are seeking your help in developing a synthesis report on inspection and maintenance
of stay cables in cable-stayed bridges. You and your agency have been selected because of the relevant knowledge and expe-
rience that we believe can be shared with us that are important to the success of this effort. We are striving to make the out-
come of this effort (i.e., the synthesis report) a valuable and state-of-the-art resource for those such as yourself who are
involved in the inspection, design, maintenance, or repair/retrofit of stay cables. The synthesis will focus on the advantages
and limitations of various non-destructive test methods, repair procedures, preventive maintenance strategies, vibration con-
trol methods, corrosion protection systems, fatigue, etc. Please feel free to contact the consultant for this synthesis project,
Dr. Habib Tabatabai, at (414) 229-5166 or ht@uwm.edu should you have any questions. You may also receive a call or e-mail
from the consultant for the purpose of clarifying or augmenting your answers to the questions. Please provide any additional
information that you feel is relevant to the answers provided in the questionnaire. Thank you in advance for your valued input
into this effort.
Respondent Information:
Please provide the information requested below for the person completing this questionnaire (if you received the question-
naire and someone else is in a better position to respond, please forward the document to that person).
Agency:
Name:
Title:
Street address:
City:
State:
Zip code:
Telephone:
Fax:
E-mail:
Please return the completed questionnaire and any supporting documents by e-mail, fax, or mail by Friday
March 26, 2004 to:
Habib Tabatabai
Department of Civil Engineering & Mechanics
University of WisconsinMilwaukee
3200 N. Cramer Street
Milwaukee, WI 53211
Telephone: (414) 229-5166 Fax: (414) 229-6958
E-mail: ht@uwm.edu
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QUESTIONS
Please feel free to expand on your answers to the following questions. If you need additional space, you can use the comments
section at the end of this questionnaire.
1) Are you or your agency involved in the design, fabrication, inspection, testing, repair, maintenance, or retrofit of stay
cables in cable-stayed bridges?
Yes No
If the answer is "Yes," please proceed to the next question. If the answer is "No," please return the questionnaire
as directed above and thank you for your time. Please note that submitting a "blank" questionnaire is preferred to
not submitting.
2) Is your agency an owner (or responsible for the maintenance) of at least one cable-stayed bridge?
Yes No Soon
If the answer is "Yes" or "Soon," please proceed to the next question. If the answer is "No," please proceed to ques-
tion No. 5.
3) How many cable-stayed bridges are under the jurisdiction of your agency or are maintained by your agency?
1 2 3 over 3 (please provide number)
4) Please provide the following information on each of the cable-stayed bridges that are maintained by your agency. (If you
have more than two cable-stayed bridges, please provide the requested information on additional sheets. Also, please
note that MTE refers to the main tension-resisting elements in the cable, which are typically 7-wire strands, parallel wires,
or bars.)
No. Questions Bridge No. 1 Bridge No. 2
4-1 Bridge name and location
4-2 Year built
4-3 Main span length (ft)
4-4 Type of main tension element (MTE)? (7-wire steel strand, steel
wire, steel bar or threadbar, rope, helical lock-coil strand, other)
4-5 Coating/treatment on main tension element within free length of
cable? (bare, greased-and-sheathed, epoxy-coated on outside only,
epoxy-coated inside and outside, galvanized steel, stainless steel,
other)
4-6 Are the coatings/treatments on main tension element discontinued
or removed within the anchorage zone? (yes, no, not known, not
applicable)
4-7 Type of grout used? (grout not used, cement-water, cement-water-
admixtures, commercial pre-packaged grouts, not known)
4-8 Are filler materials used in the anchorage zone? (yes--grout, yes--
grease, yes--other, no filler, not known)
4-9 Type of anchorage? (wedges, conical socket with wedges, cylindri-
cal sockets with wedges, "Hi-Am"-type, other)
4-10 Do cables go over "saddles" on the pylons? (yes, no)
4-11 Type of cable sheathing used? [HDPE with PVF (Tedlar®) tape,
UV-resistant HDPE, UV-resistant HDPE with spiral on surface,
HDPE with dimples on the surface, steel pipe, no sheathing, other]
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No. Questions Bridge No. 1 Bridge No. 2
4-12 Have rainwind-induced cable vibrations been observed on this
bridge? (yes, no, not known)
4-13 Have MTE corrosion problems been noted? (yes, no, not known)
4-14 Do cables have neoprene rings near the top and bottom anchorages?
(yes, no, not known)
4-15 If there are neoprene rings on the cables, have there been any
reports of movements of the rings out of their positions? (yes--due
to loosening of retainers, yes--due to shearing off of retainers,
yes--due to other reasons, no, not known, not applicable)
4-16 Has moisture been found in any of the internal components of stay
cables such as the bottom anchorage areas? (yes, no, not tested, not
known)
4-17 Has fatigue of MTE or other components of stay cables been
observed (yes, no, not known)
4-18 Do the cables have viscous dampers installed at deck or tower
levels? (yes--from the beginning, yes--retrofitted to correct
vibrations, no)
4-19 Do the cables have cross cables installed between them? (yes--from
the beginning, yes--retrofitted to correct vibrations, no)
4-20 Do cables have other dampers (other than viscous or neoprene
rings) to control vibrations? [yes--tuned mass dampers, yes--other
dampers (please specify) , no, not known]
4-21 Has cracking of the cable sheathing or sheathing connections been
noted? (yes--sheathing, yes--connections, yes--both, no, not
known, not applicable)
4-22 Has cracking or misalignment of the guide pipes been noted? (yes--
cracking, yes--misalignment, yes--both, no, not known,
not applicable)
4-23 If there is protective tape wrapped around the cable sheathing, have
there been reports of deterioration of the tape? (yes--minor damage,
yes--moderate damage, yes--extensive damage, no, not known,
not applicable)
4-24 Have any problems associated with neoprene boots been noted?
(yes, no, not known, not applicable)
4-25 Types of non-destructive tests that any of the cables on this bridge
have been subjected to? [magnetic, X-ray, ultrasonic, vibration-
based force measurements, other (please specify), not performed,
not known]
4-26 Types of sensor-based long-term monitoring performed on the
cables? [acoustic wire break detection, vibration monitoring, force
measurements, other (please specify), not performed, not known]
4-27 Have the cables on this bridge (or any of their components) been
repaired? [yes (please explain), no, not known]
4-28 Has the sheathing been partially removed on any of the cables to
examine condition of grout (if applicable) and/or the MTE? (yes,
no, not known, not applicable)
4-29 Can the strands or cables be replaced if needed? (yes, no, not
known)
4-30 Do you have an inspection and maintenance manual for this bridge?
(yes, no, not known)--If yes, we would appreciate receiving a copy
of this manual for the purposes of this synthesis report.
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5) Based on your experience and in general, do you believe that the current inspection, testing, monitoring, and repair meth-
ods available to you for stay cables are effective and adequate?
· Yes
· No
· Not known
6) Please comment on the effectiveness of any non-destructive test methods for inspections of stay cables that you may be
familiar with. These methods include (but are not limited to) ultrasonic testing, magnetic inspections, laser-based force
measurements, X-ray imaging, etc. If possible, please comment on issues such as practicality, cost, duration, impact on
traffic, and any other factors that you consider important.
7) Please comment on the effectiveness of any cable vibration control measures that you may be familiar with. Examples
include installation of cross cables, viscous dampers, neoprene rings, etc.
8) Please comment on the effectiveness of any sensor-based long-term monitoring systems for stay cables that you may
be familiar with. Examples include acoustic monitoring, vibration monitoring, force measurements, strain measure-
ments, etc.
9) What would you recommend that the cable suppliers incorporate into their systems to make cables more accessible and
inspectable?
10) Do you believe that an up-to-date resource such as a national database of information on stay cable inspection methods,
repairs, and testing would be a useful tool?
· Yes
· No
· Not known
11) What do you see as the single most important problem in stay cable maintenance?
12) Please comment on any other methods for inspections, testing, monitoring, and repair of stay cable (including conven-
tional methods) that you have found beneficial and are not listed above.
Additional comments?
We appreciate the time you have taken to provide this information and thank you very much for your help with this
important undertaking.
