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Cyclic

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pushover

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analysis

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may

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be

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performed

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using

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either

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of

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two

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approaches,

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outlined

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as

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follows:

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Sequence of nonlinear-static

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load

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cases

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Cyclic

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pushover

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analysis

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may

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be

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performed

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through

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a

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sequence

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of

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chained

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pushover

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analyses.

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Two

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key

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aspects

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of

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this

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approach

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include:

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  • Each

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  • pushover

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  • analysis

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  • would

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  • be

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  • pushing

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  • the

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  • structure

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  • in

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  • the

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  • direction

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  • opposite

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  • to

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  • that

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  • of

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  • the

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  • preceding

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  • pushover

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...

...

  • .
  • Each pushover load case, aside from the first, would use stiffness at the end of the previous pushover load case.

Time-history load cases

An alternate approach is to use a single nonlinear time-history load case.

Some special considerations are necessary when using a time-history load case to model applied loading, listed as follows:

  • Load should be scaled up or down to achieve the monitored pushover displacement desired for each cycle.
  • The time function should consist of linear segments which apply the loads in one direction and then the reverse, possibly with a constant segment to hold loads before their reverse.
  • For each cycle in the sequence, the peak positive and negative time-function values must be found, starting with the first cycle of load application.


A sample of a time function is shown in Figure 1:


Image Added