GSA 8'4 Footfall Analysis using User Defined DLFs

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GSA 8.4 Footfall Analysis using User Defined
DLFs
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Footfall analysis using user defined DLFs

• Footfall analysis using user defined DLFs
• Footfall analysis is a dynamic response analysis.
  The key to have reliable results is to have the
  correct input data
• Footfall loads are considered as periodic loads
  as shown below, a periodic load can be decomposed
  into a number of harmonic components
• The normalised magnitudes of each of the harmonic
  components are called Dynamic Load Factor (DLF)
  that are crucial for the accuracy of the footfall
  analysis

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Footfall analysis using user defined DLFs

• Footfall analysis using user defined DLFs
• The DLFs given by design guides are obtained
  through statistical analyses of test results,
  therefore DLFs are empirical and no theoretical
  values available
• At the moment, deferent design guides give
  different DLFs (see the next three slides for the
  differences). This may indicate that there may
  be more accurate DLFs that represent footfall
  loads
• If you know a better DLFs for the footfall loads,
  you can define the DLFs in GSA and use it in GSA
  footfall analysis, so the footfall response
  analysis results may be more accurate
• To use user defined DLFs in the analysis, you
  need to make sure the reliability of the DLFs to
  the footfall loads you want to consider, so that
  the footfall response results are reliable
• For experienced users, User defined DLFs can also
  be used to simulate the loads of a group people
  doing synchronised activities

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Footfall analysis using user defined DLFs

• The definition of user defined DLFs in GSA

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Footfall analysis using user defined DLFs

• DLFs from The Concrete Centre design guide

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Footfall analysis using user defined DLFs

• DLFs from design guide of AISC SDGS 11

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Footfall analysis using user defined DLFs

• DLFs from SCI Design Guide P354

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