Upgrade of Seismically Deficient Steel Frame Structures Built in Canada Between the 1960s and 1980s Using Passive Supplemental Damping
A typical 1960s Type 2 Construction steel MRF hospital structure in Quebec, representative of a prevalent construction philosophy of the time, was investigated and modelled in OpenSees using an advanced strength degradation model. The structure was then subjected to a nonlinear time-history analysis...
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| Language: | en_ca |
| Published: |
2012
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| Online Access: | http://hdl.handle.net/1807/33281 |
| Summary: | A typical 1960s Type 2 Construction steel MRF hospital structure in Quebec,
representative of a prevalent construction philosophy of the time, was investigated and
modelled in OpenSees using an advanced strength degradation model. The structure
was then subjected to a nonlinear time-history analysis (NLTHA) for Montreal (MTL)
and Vancouver (VAN) ground motions and was found to be deficient under the design
hazard levels. Retrofits were proposed for the two orthogonal frames at both sites
using a performance-based approach. An experimental program determined that the
connections had less ductility than expected and began deteriorating around 2.0%
interstorey drift. The OpenSees model was updated according to the experimental
connection behaviour and the predicted NLTHA performance of the structure
worsened. The proposed retrofit designs for both orthogonal frames in both MTL and
VAN were updated with the new connection behaviour and final retrofit designs were
proposed. |
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