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Proposed Specifications for LRFD Soil-Nailing Design and Construction (2011) / Chapter Skim
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4: Conclusions and Suggested Research
Pages 63-66

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From page 63...
... . In this approach, several steps were followed, from selecting a target reliability index that is consistent with the level of structural redundancy of SNWs, to a Monte Carlo simulation to estimate pullout resistance factors.
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From page 64...
... Although the load factor should be selected as 1.0 for service limit states (per current AASHTO LRFD practice, as mentioned previously) , a series of pullout resistance factors was obtained for a range of load factors other than 1.0 to show the effect of load factors on the pullout resistance factor for each of the soil/rock types considered.
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From page 65...
... . • The current database of pullout resistance based on soil nail load tests can be expanded and subdivided for certain construction procedures that directly affect pullout capacity, including drilling techniques, practice for cleaning the hole, grout characteristics, etc.
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From page 66...
... bars, and different head nail connections. • Aspects related to the seismic design of substructures that have been recently proposed in interim editions of the AASHTO LRFD Bridge Design Specifications may require evaluation in order to adapt those changes to the design of SNWs.
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Key Terms

  • pullout resistance
  • resistance factors
  • load factors
  • aashto lrfd
  • limit states

  • lrfd method
  • comparative designs
  • nail pullout
  • bridge design
  • nail length

  • service limit
  • limit state
  • lrfd bridge
  • nail loads
  • resistance factor

  • required soil
  • nail load
  • designing snws
  • types considered
  • load factor

  • retaining structures
  • surcharge loads
  • reliability index
  • snws using
  • current database

  • load tests
  • monte carlo
  • lrfd practice
  • factors based
  • spatial variability


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