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SEAONC Computer Forum - December 10, 1998

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ÐÏࡱáSeismic Analysis Case Studies
December 10, 1998

The Computer Applications Committee's December 10th Computer Forum will present the case studies utilizing the state of the art analysis.  This forum will provide an opportunity to discuss about two excellent structural engineering projects.  

Darrick Hom of Degenkolb Engineers will present a case study where he has applied the static nonlinear analysis procedures described in the ATC-33 pre-ballot draft document (now known as FEMA 273) to a 4-story reinforced, non-ductile concrete frame structure.  This analysis procedure was used to evaluate the expected seismic performance of the building and to develop an appropriate retrofit scheme. As many of the procedures were untested at the time of this analytical study, it was a challenge not only to evaluate the building structure itself, but also to evaluate the methodology used for the analysis.  The results for both these aspects offer important information which can be used in the practical use of the nonlinear analysis procedures.

Leo Panian from Steven Tipping + associates (STA) will present another case study discussion titled "Practical Analytical Methods Used in the Seismic Retrofit Design of an 11 Story Steel Frame Building Constructed in 1916."  The retrofit scheme for this One Market Street building in San Francisco utilizes a pair of large cantilevered hollow concrete tubes, supported by deep foundations in the underlying bay mud, to resist the earthquake forces and limit drift to protect the existing building frame and masonry in-fill walls.  A complete capacity design approach was used to develop the seismic retrofit.  Several global and local analyses were performed to evaluate the ductile response of the system.  Bounding analyses were employed to capture the effects of upper and lower bound material properties and varying dynamic load distributions. Since the foundation plays a significant role in the seismic response of this building, detailed non-linear soil-structure interaction analyses were employed to verify the adequacy of the foundation design.  This case study presentation will provide a detailed overview of these design and analysis methods.

This forum will take place on Thursday, December 10th from 6:00 p.m. to 8:00 p.m. at the office of Degenkolb Engineers at 225 Bush Street, 10th Floor, in San Francisco.  There is no charge for the event.  Please RSVP to Satinder P. Singh  (spsingh(--nospam--at)pacbell.net  or fax: 510/465-9443 or Phone: 510/465-3977) if you would like to attend this forum.
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