000018762 001__ 18762
000018762 005__ 20170118182240.0
000018762 04107 $$aeng
000018762 046__ $$k2017-01-09
000018762 100__ $$aSimpson, Barbara
000018762 24500 $$aSeismic Assessment of the "Strongback" System

000018762 24630 $$n16.$$pProceedings of the 16th World Conference on Earthquake Engineering
000018762 260__ $$b
000018762 506__ $$arestricted
000018762 520__ $$2eng$$aConventional steel braced frames have a tendency to form weak stories during strong earthquake shaking, concentrating damage in a few stories while the rest of the frame contributes little to the structure’s ability to dissipate energy. A two-story, one-bay “strongback” (SB) braced frame was tested under quasi-static cyclic loading conditions to assess the system’s ability to mitigate this weak story behavior as part of a strategy to retrofit an existing building. The SB system employs an elastic mast that is pinned at its base to the foundation and runs over the full height of the structure. The mast imposes a displaced shape that increases linearly with height, resulting in nearly uniform drift demands in all stories. The test specimen arranged the braces in a “lambda” configuration, with a single buckling restrained brace (BRB) in the bottom story that acts as an energy dissipating “fuse” and two HSS braces that are part of a relatively strong vertically-oriented truss, or “mast.” Test results show that the SB test was effective in impeding the formation of a weak story mechanism and in mobilizing the reserve strength of other structural components even after BRB fracture. Numerical results were able to capture the overall response of the frame, including the fracture of the BRB. Based on the results from this experimental test, a three-story SB system was analyzed using OpenSEES to improve understanding this system’s behavior under a suite of 240 ground motions at three different hazard levels for a site in Oakland, CA.

000018762 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000018762 653__ $$aearthquake engineering, structural engineering, concentrically braced frames, strongback system, full-scale testing

000018762 7112_ $$a16th World Conference on Earthquake Engineering$$cSantiago (CL)$$d2017-01-09 / 2017-01-13$$gWCEE16
000018762 720__ $$aSimpson, Barbara$$iMahin, Stephen
000018762 8560_ $$ffischerc@itam.cas.cz
000018762 8564_ $$s580390$$uhttps://invenio.itam.cas.cz/record/18762/files/2186.pdf$$yOriginal version of the author's contribution as presented on USB, paper 2186.
000018762 962__ $$r16048
000018762 980__ $$aPAPER