000018832 001__ 18832
000018832 005__ 20170118182243.0
000018832 04107 $$aeng
000018832 046__ $$k2017-01-09
000018832 100__ $$aLehman, Dawn
000018832 24500 $$aSeismic Performance of Chevron Braced Frames With Yielding Beams

000018832 24630 $$n16.$$pProceedings of the 16th World Conference on Earthquake Engineering
000018832 260__ $$b
000018832 506__ $$arestricted
000018832 520__ $$2eng$$aSteel concentrically braced frames (CBFs) have been used as seismic force resisting systems for many years. In seismically active regions of the US, the chevron configuration was used extensively in older construction but is less common today due to the codification of stringent beam-strength requirements. Today, the AISC Seismic Provisions prescribes a post-buckling brace load case for SCBFs which induces large axial-flexural demands that the beam must resist in addition to gravity load effects. These provisions require deep and heavy beam sections which are not economical. An international research collaboration between the University of Washington and the National Center for Research on Earthquake Engineering in Taiwan has examined the use of beams in chevron CBFs that do not meet SCBF requirements and are expected to yield after brace buckling. The research examines the vulnerability of older chevron CBF infrastructure with yielding beams and explores the potential of yielding-beam SCBFs. The results show that brace yielding in tension is prevented due to beam deflection, but frame action mitigates the reduced brace resistance. In addition, yielding-beam frames can achieve drift capacities comparable to SCBF-compliant yielding-brace frames. Consequently, older CBFs with weaker beams may not require beam retrofit and the yielding-beam mechanism shows promise for new construction. This increases the viability for retrofit of older CBFs if the beam can be retained (allowing for focus on more impactful areas) and alleviates economic concerns for chevron SCBFs.

000018832 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000018832 653__ $$asteel; braced frames; chevron; nonductile; rehabilitation

000018832 7112_ $$a16th World Conference on Earthquake Engineering$$cSantiago (CL)$$d2017-01-09 / 2017-01-13$$gWCEE16
000018832 720__ $$aLehman, Dawn$$iTsai, Keh-Chyuan$$iLi, Chao-Hsien$$iWu, An-Chien$$iRoeder, Charles$$iBerman, Jeffrey$$iSen, Andrew
000018832 8560_ $$ffischerc@itam.cas.cz
000018832 8564_ $$s1252034$$uhttps://invenio.itam.cas.cz/record/18832/files/2319.pdf$$yOriginal version of the author's contribution as presented on USB, paper 2319.
000018832 962__ $$r16048
000018832 980__ $$aPAPER