EXPERIMENTAL MULTI-LEVEL SEISMIC PERFORMANCE ASSESSMENT OF 3D RC FRAME DESIGNED FOR D

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EXPERIMENTAL MULTI-LEVEL SEISMIC PERFORMANCE ASSESSMENT OF 3D RC FRAME DESIGNED FOR DAMAGE AVOIDANCE

Author: Brendon A Bradley1* , Rajesh P Dhakal1 , John B Mander1 , Louman Li1 . 1 Department of Civil Engineering, University of Canterbury, , New Zealand | Size: 591 KB | Format: PDF | Quality: Unspecified | pages: 33

This paper experimentally investigates the application of damage avoidance design (DAD) philosophy to moment resisting frames with particular emphasis on detailing of rocking interfaces. An 80% scale 3-dimensional rocking beam-column joint sub-assembly designed and detailed based on damage avoidance principles is constructed and tested.
Incremental dynamic analysis (IDA) is used to select ground motion records to be applied to the sub-assembly to conduct a multi-level seismic performance assessment (MSPA).
Analyses are conducted to obtain displacement demands due to the selected near and medium
field ground motions that represent different levels of seismic hazard. Thus predicted
displacement time histories are applied to the sub-assembly to conduct quasi-earthquake displacement (QED) tests. The sub-assembly performed well reaching drifts up to 4.7% with only minor spalling occurring at rocking beam interfaces and minor flexural cracks in beams.
Yielding of post-tensioning tendons occurred, but the sub-assembly did not collapse. The externally attached energy dissipaters provided large hysteretic dissipation during large drift
cycles. The sub-assembly satisfied all three seismic performance requirements, thereby verifying the superior performance of the DAD philosophy.

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