000019151 001__ 19151
000019151 005__ 20170118182302.0
000019151 04107 $$aeng
000019151 046__ $$k2017-01-09
000019151 100__ $$aSteele, Taylor
000019151 24500 $$aCollapse Assessment of Controlled Rocking Steel Braced Frames With Different Base Rocking Joint Parameters

000019151 24630 $$n16.$$pProceedings of the 16th World Conference on Earthquake Engineering
000019151 260__ $$b
000019151 506__ $$arestricted
000019151 520__ $$2eng$$aPrevious studies have shown that designing controlled rocking steel braced frames (CRSBFs) using a response modification factor of R = 8 is sufficient to prevent collapse of structures during earthquakes higher than the design level. However, it has also been suggested that CRSBFs could be designed using higher response modification factors (R), and that additional rocking joints could be used to mitigate higher mode force demands. This paper examines how the selection of R and the specification of additional rocking joints above the base influence the collapse risk of CRSBFs, as assessed using incremental dynamic analysis (IDA) and the FEMA P695 methodology. Six designs are considered, in which different base rocking joints are designed for one six-storey frame using different R values and post-tensioning arrangements. An additional six scenarios are considered, in which the same base rocking joints are used in combination with a second rocking joint above the second storey. A suite of 44 ground motions is selected and scaled until collapse occurs in at least 50% of the cases, and collapse fragility functions are generated using the truncated IDA curves. In all twelve cases, the probability of collapse is less than 10% during a 2% in 50 year event. However, the results show that R and the posttensioning arrangement have a large influence on the collapse risk, while adding rocking joints above the base has a less significant influence.

000019151 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000019151 653__ $$acontrolled rocking steel braced frames, self-centering systems, higher mode mitigation, incremental dynamic analysis, collapse risk assessment

000019151 7112_ $$a16th World Conference on Earthquake Engineering$$cSantiago (CL)$$d2017-01-09 / 2017-01-13$$gWCEE16
000019151 720__ $$aSteele, Taylor$$iWiebe, Lydell
000019151 8560_ $$ffischerc@itam.cas.cz
000019151 8564_ $$s1141791$$uhttps://invenio.itam.cas.cz/record/19151/files/2963.pdf$$yOriginal version of the author's contribution as presented on USB, paper 2963.
000019151 962__ $$r16048
000019151 980__ $$aPAPER