DFI Electric Power Systems Foundations Working Group

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1 DFI Electric Power Systems Foundations Working Group Utility Survey Questions First Name: Last Name: Company Name: Work Phone: Address: City: State/Province: Country: A. Demographics 1. Please select your engineering discipline. Civil Geotechnical Structural Electrical Other: 2. What is your level of engineering experience with foundation design? 0-5yrs 5-10yrs 10-20yrs 20+yrs 3. Are you a registered professional engineer? Page 1 of 12

2 B. Deep Foundation Design Approach 4. What code(s) do you use for load development? (Mark all that apply) NESC CAS C22.3 GO95 5. What additional load cases outside of the legislated loads per referenced codes do you use? (Mark all that apply) Local climate Construction Maintenance Security 6. Do you utilize an internal design manual for deep foundation design? 7. If yes, do you use an internal design manual, what foundation types are covered? Drilled shafts Driven piles Micropiles Helical piles ACP/CFA Piles Other 8. Would you be willing to provide a copy of the design manual to this working group for internal review? 9. What type of deep foundation design methodology do you use? RBD Reliability Based Design ASD Allowable Stress Design Page 2 of 12

3 C. Deep Foundation Design Practices 10. Please list the magnitudes of the load factors and/or safety factors you use for deep foundation design. From 1.0 to 2.0 > 2.0 Electric code factors RBD factors Do not use factors, deflection controls Other 11. Do you use the same magnitudes of load or safety factors for foundation construction materials, such as reinforced concrete or steel? 12. If no, please indicate how these factors differ. Lower than used for foundation depth/diameter design Higher than used for foundation depth/diameter design t applicable Other 13. What foundation deflection criteria do you use for tubular steel poles? A specified value of inches A specified range of inches Varies by foundation diameter ne Page 3 of 12

4 14. What foundation rotation criteria do you use for tubular steel poles? A specified value of A specified range of ne degrees degrees 15. What axial maximum movement criteria do you use for lattice towers (uplift and/or compression)? A specified value of A specified range of Varies by foundation diameter ne inches inches 16. How were these deflection criteria determined? In house standards Past/historical performance Experience Consultant recommendations Published information 17. Under what load condition is deflection and/or rotation evaluated? Factored loads Service loads Page 4 of 12

5 18. Do you integrate the drilled pier deflection/rotation criteria with the similar allowable criteria for the top of steel poles for the pole manufacturer? If yes, please describe how, e.g., do you assume a total maximum top of pole deflection and split this up between the foundation and pole allowable? 19. What software and version do you use to design your deep foundations - poles and towers? (Mark all that apply) EPRI FAD Tools Ensoft LPile Ensoft Group Shaft Caisson AllPile 20. What is the typical height of foundation projection above grade do you assume? Aspecified value of feet Aspecified range of feet Varies by location ne 21. Do you assume any soil property discount (reduction) for near surface soils? Page 5 of 12

6 22. How are the effects of reduced soil capacity for foundations on/near slopes accounted in design? Diameter based Equivalent ground method Specified depth Part of the design model Varies t taken into consideration t known 23. How are water flow impacts such as scour accounted in design? Add reveal Value recommended by consultant Perform an engineering evaluation Install protection (no modification to foundation) t included in design Unknown / not applicable 24. Do you design foundations for liquefaction effects? If yes, what is your engineering approach? Add reinforcement Recommendations by consultant Perform an engineering evaluation Unknown Page 6 of 12

7 D. Geotechnical Exploration Practices 25. What types of geotechnical exploration techniques do you use to obtain foundation design parameters? (Mark all that apply) Desktop studies Borings Cone penetrometer tests Geophysical investigations, rock cores 26. Please describe the data on which you base your geotechnical design, e.g., do you generally obtain site specific geotechnical data for every structure, do you develop a generalized geotechnical design strata based upon limited borings, or other? Sample every structure Sample one per mile Sample at critical structures Geologic-based sampling Varies 27. What is the basis for determining spacing between a limited number of borings? Structure-based Mileage-based Geology-based Page 7 of 12

8 28. Do you require a soil corrosivity analysis? If no, do you employ a standard practice for soil corrosivity? Coat direct embedment steel Modify cement type in backfill Use general site knowledge t applicable; Unknown ne 29. Do you assume a minimum embedment into bedrock? If yes, what is that embedment? A specified value of feet A specified depth in terms of pier diameter If not, how do you determine rock socket depth? E. Reinforced Concrete Design Practices 30. Is the concrete strength used for construction higher than assumed in design? 31. Do you have specific concrete mix design that you require the contractor to use? If Yes (Please describe below); Page 8 of 12

9 32. What design methodology do you use to determine the minimum longitudinal reinforcing? Minimum steel Codes (ACI, CSA, etc.) Computer program results Other 33. What methods are used for anchor bolt design? ASCE 48; CSA A23.3 Vendor supplies this information ACI t Applicable Unknown 34. Recognizing that ACI 318 states it does not apply to drilled shafts, what code or methodology do you use for reinforcement design? Highway drilled shaft methods ACI or modified ACI methods CSA A23.3 methods Computer program Varies t applicable 35. What provisions do you use for splicing of vertical reinforcement? ACI 318 CRSI FHWA Page 9 of 12

10 F. Direct Embedment Pole Design Practices 36. What type of material is specified for backfill? (Mark all that apply) Compacted native soil Engineering aggregate fill Concrete 37. What design parameters are used in your design methodology for the backfill? (Mark all that apply) Friction angle Cohesion; unit weight Deformation modulus 38. Are pole embedment based on analytical methods or general practice methods (10% + 2' or 4') for design? (Mark all that apply) Analytical methods General practice methods G. Alternate Deep Foundations 39. Do you allow the use of deep foundation alternates to drilled shafts or direct embeds (such as micropiles, auger cast piles or helical anchor foundations)? Page 10 of 12

11 40. Do you have foundation specifications for specific alternate foundation types? 41. What types of foundation specifications for specific alternate foundation types do you have? (Mark all that apply) Drilled shafts Driven piles Micropiles Helical piles ACP/CFA H. Foundation Field Testing and Validation 42. Do you have specific testing requirements to validate installed foundation capacity (i.e., proof or ultimate testing)? If yes, what type of testing do you require? Compression Tension Lateral Combined Page 11 of 12

12 I. Foundation Construction Considerations 43. Do you have limitations on free fall of placed concrete? If yes, please describe: 44. What procedures or requirements do you have for the use of cold or construction joints with drilled shaft foundations? t allowed Joints placed at a design-defined depth Joints placed at a designated depth Page 12 of 12

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