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TO DO:

  • Provide example with solutions and midspan-moment checks for a 3-span continuous beam subjected to uniform and point loading.

The pattern live-load factor (Pllf) is intended to account for variability in the live-load arrangement on a structure. Since live-load pattern is not automated, Pllf approximates its design effect.

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Pattern live-load factors may be assigned to individual elements using the Design > Steel Frame Design or Concrete Frame Design > View/Revise Preferences command, as shown in Figure 1:

 


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Figure 1 - Pattern live-load factor

Example

The maximum positive midspan design moment induced by uniform dead- and live-load application would be calculated as follows:

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  • Mpos MAX - maximum positive midspan design moment assuming a simply-supported condition with no continuity for live load

    Given point loading, Mpos MAX would be calculated similarly as for uniform loading, in which a simply supported condition is assumed and the live-load factors specified are applied.


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Related Emails:

  • Email "Wiki entry on pattern live load": (ok → rs, 10/25/2010, ID 7635351)