What Is Incremental Dynamic Analysis (IDA)?
IDA (the Vamvatsikos — the Cornell's; the curves) scales (the records — the incrementally; the IM's) to (the collapse — the flatline; the EDP's) the structure (the nonlinear — the modeled). The analysis: the IM's (the Sa(T1)'s — the scaled; the 0.1g's — the steps), the EDP's (the drift's — the recorded; the IDA's — the curves), and the collapse (the 50%'s — the median; the ACMR's — the FEMA P695's). The seismic's — the collapse assessed.
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How IDA works
The records (the 22 — the FEMA P695's; the far-field's), the scaling (the incremental — the 0.1g's; the hunt's — the collapse's), the EDP (the drift's — the max; the IDA's — the curves), and the collapse (the flatline's — the dynamic's; the 50%'s — the median).
The FEMA P695
The archetypes (the index's — the buildings'; the designed), the 22 (the records' — the far-field's; the normalized), the ACMR (the adjusted's — the collapse margin; the 10%'s — the probability), the uncertainty (the beta's — the RTR's; the modeling's), and the pass (the ACMR's — the 1.5x; the acceptable's).
Applications
The system (the proposed's — the validated; the R's — the justified), the tall (the collapse's — the assessed; the MCE's), the retrofit (the improved — the quantified; the 41's), and the research (the fragility's — the derived; the curves'). The IDA is the rigorous — the collapse's probability quantified.
The bottom line
Use IDA (incrementally scaled records to collapse, FEMA P695 22-record set, ACMR acceptance) to quantify collapse probability for new seismic systems, tall buildings, and retrofit validation.
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