Below is the uncorrected machine-read text of this chapter, intended to provide our own search engines and external engines with highly rich, chapter-representative searchable text of each book. Because it is UNCORRECTED material, please consider the following text as a useful but insufficient proxy for the authoritative book pages.
122 This appendix contains the state DOT survey. A P P E N D I X B State DOT Survey
State DOT Survey 123 NCHRP Synthesis 49-12 Seismic Design of Non-Conventional Bridges Dear Bridge Engineers: The Transportation Research Board (TRB) is preparing a synthesis of practice for seismic design of non- conventional bridges. This is being done for NCHRP, under the sponsorship of the American Association of State Highway and Transportation Officials, in cooperation with the Federal Highway Administration. The objective of NCHRP Synthesis Topic 49-12 is to document the procedures used by state departments of transportation (DOTs) for seismic design of non-conventional bridges. For the purpose of this study, the scope of "non-conventional bridgesâ includes any cable-supported bridges, long span arch bridges, delta frame substructures, and any other structures where the owner has elected to adopt special design procedures for a bridge structure or sub-structure due to that structure not falling within the parameters applicable to the AASHTO Code or Guide Spec. This questionnaire is an essential part of the synthesis study and we would greatly appreciate your response. If your agency has not addressed the question of seismic design criteria for non-conventional bridges, please answer the first few questions and submit your response. If your agency does have this experience, the questionnaire will branch to questions about the agency's seismic design practices for these bridge types. We estimate that it should take approximately 20 minutes to complete the questionnaire (much less for agencies with no experience with this topic). This questionnaire is being sent to the DOT voting members of the AASHTO Committee on Bridges and Structures. If you are not the appropriate person at your organization to complete this questionnaire, please forward it to the correct person. Please complete and submit this survey by February 28, 2018. If you have any questions, please contact our principal investigator David Goodyear at david.goodyear@tylin.com or 360-252-2601 Thank you very much for your time and expertise! QUESTIONNAIRE INSTRUCTIONS 1. To view and print the entire questionnaire, Click on the following link {pdf survey} and print using "control p". 2. To save your partial answers and complete the questionnaire later, click on the "Save and Continue Later" link at the top of your screen. A link to the incomplete questionnaire will be emailed to you from
124 Seismic Design of Non-Conventional Bridges SurveyGizmo. To return to the questionnaire later, open the email from SurveyGizmo and click on the link. We suggest using the âSave and Continue Laterâ feature if there will be more than 15 minutes of inactivity while the survey is opened, as some firewalls may terminate due to inactivity. 3. To pass a partially completed questionnaire to a colleague, click on the on the "Save and Continue Later" link at the top of your screen. A link to the incomplete questionnaire will be emailed to you from SurveyGizmo." Open the email from SurveyGizmo and forward it to a colleague. 4. To view and print your answers before submitting the survey, click forward to the page following question 14. Print using âcontrol p.â 5. To submit the survey, click on "Submit" on the last page. DEFINITIONS: AASHTO Guide Spec: AASHTO Guide Specification for LRFD Seismic Bridge Design, Second Edition Conventional Bridge: Single or multi-span bridge with slab, beam, box girder superstructure, supported with concrete pier or pile bent substructure. Conventional bridges include all geometries and configurations of typical beam-type highway overcrossings and simple span bridges. The bridge may be designated as critical, essential or non-critical/non-essential (note that the AASHTO Guide Spec does not address essential or critical bridges). Non-Conventional Bridge: Cable supported, arch, non-traditional girder section (open web box, Vierendeel truss or similar), truss or long-span box girder superstructure, supported with mass foundations, box piers, truss piers or towers where the bridge structure or sub-structure does not fall within the parameters applicable to the AASHTO Code or Guide Spec, which have long fundamental periods beyond the range of the AASHTO Design Response Spectrum or for which a strong beam-weak column design methodology may not satisfy specified performance standards. The bridge may be designated as critical, essential or non- critical/non-essential. Seismic Design Category: AASHTO Guide Spec ground motion based classification for seismic design requirement (from AASHTO Guide Spec), or equivalent category from AASHTO LRFD. Please enter the date (MM/DD/YYYY). * ?
State DOT Survey 125 1. State or Agency * 2. Has your Agency directed the design of Seismic Design Category B, C or D (definition in the Guide Spec) or Zone 2, 3 or 4 (definition in AASHTO BDS or similar ground motion levels) bridges in your jurisdiction? * Yes No 3. Has your Agency directed the design of a non-conventional bridge (see definition, above) for Seismic Design Categories noted in Question 2? Yes No 4. What specification(s) serve as the basis or reference for your design criteria? AASHTO LRFD Bridge Design Specification (BDS) AASHTO Guide Specification for LRFD Seismic Bridge Design (Guide Spec) NCHRP 12/49 (Applied Technology Council-ATC 49) Agency or Project Specific only Other - Write In 5. Do you reference any non-US standards for seismic design criteria? No Yes - Write In (Required) *
126 Seismic Design of Non-Conventional Bridges 6. What bridge types are included in your non-conventional bridge resume? Cable-Stayed Suspension Arch Extrados Cantilever truss or box girder (over 250ft main span) Other - Write In (Required) * 7. Approximately how many non-conventional bridges in your jurisdiction have been designed for earthquake in the last 30 years? Less than 2 2 to 5 More than 5 8. Did you use non-linear time history analysis for design of any bridge type(s) in Question 6? Yes No 9. Did seismic demand control the lateral force or displacement based design for any of the bridge(s) in Q7? Yes No 10. Have you specified multi-level seismic events (eg, a 250 year return for operation and 2500 year return for no-collapse or sim) for your non-conventional bridge design(s)? Yes No (will then skip to Q12)
State DOT Survey 127 11. The reason for specifying a multi-level event was: Lifeline status of the facility Financial Risk Life safety Risk Other - Write In (Required) * 12. What are your primary sources for establishing performance criteria? AASHTO LRFD BDS AASHTO Guide Spec Research - Write In ATC - Write In Other - Write In 13. Please indicate whether or not you can provide a plan and elevation drawing for specific structures where you have applied non-conventional bridge seismic design criteria, along with the criteria document that relates to the seismic design basis for the bridge substructure and foundation system(s) {uploading is within Survey Gizmo using the link in Q14. If respondent prefers using a cloud site for upload, please contact the PI at david.goodyear@tylin.com}. Additional information is posted Additional information will be posted by (date) * No additional information is available
128 Seismic Design of Non-Conventional Bridges 14. Are project design criteria documents available from the Agency for reference in the Synthesis? If so, please upload to the link below (link allows up to a 25MB file and up to 10 files). Browse...
State DOT Survey 129 Please indicate if you are available to be contacted by the principal investigator for further information, and enter your contact information. May we contact you for further information? Yes No First Name * Last Name * Title Agency/Organization * Street Address Suite City State Zip Code Email Address * Phone Number *
130 Seismic Design of Non-Conventional Bridges Thank you for taking our survey! Your response is very important to us. If you have any questions or comments, please feel free to contact David Goodyear at: E-mail: david.goodyear@tylin.com Phone: 360-252-2601 Mailing Address: 1115 West Bay Drive, Sui 206, Olympia, WA 98502
