FEMA 451B - Topic15-5a, b and c - Advanced Analysis for Performance Based EQ Engineer

[Dell_Brett]

FEMA 451B - Topic15-5a, b and c - Advanced Analysis

This topic addresses structural analysis requirements in performance-based earthquake engineering. Such analysis must typically include a variety of nonlinear effects, both material and geometric. This topic provides an overview of nonlinear analysis methodologies.
•Basic modeling concepts
•Nonlinear static pushover analysis
•Nonlinear dynamic response history analysis
•Incremental nonlinear dynamic analysis
•Probabilistic approaches
This is a summary of the topics covered. It should be emphasized that this slide (third bullet) and subsequent slides use the terminology “Response History Analysis” instead of “Time History Analysis”. Response history is a more accurate description of what is being done. Analyzing the history of time makes little sense, whereas the history of the response of a structure is meaningful. Incremental Dynamic Analysis (IDA) is a relatively new approach that uses response history analyses in a systematic manner to assess the behavior of a structure subjected to a suite of ground motions. The structure is repeatedly analyzed for each motion scaled for gradually increasing intensities. For each intensity analyzed, certain damage measures are recorded and plotted against intensity to produce “IDA Curves”.
We will only briefly review the probabilistic approaches because the approach is quite new, and has not been fully formulated. We will describe the probabilistic approach used by FEMA 350, and the broader approach being suggested by PEER.

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[kowheng]

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