000018215 001__ 18215
000018215 005__ 20170118182213.0
000018215 04107 $$aeng
000018215 046__ $$k2017-01-09
000018215 100__ $$aLignos, Dimitrios
000018215 24500 $$aCollapse Behavior of Steel Columns as Part of Steel Frame Buildings: Experiments and Numerical Models

000018215 24630 $$n16.$$pProceedings of the 16th World Conference on Earthquake Engineering
000018215 260__ $$b
000018215 506__ $$arestricted
000018215 520__ $$2eng$$aEarthquake-induced collapse risk assessment of steel frame buildings requires the use of deterioration models that simulate instabilities that cause strength and stiffness deterioration of structural steel components. In the case of steel columns in addition to cyclic deterioration in flexural strength, such models should capture the axial load – bending interaction, the axial contraction as well as the axial strength deterioration after the formation of local buckling within the column cross-section. Based on the available literature, experimental data that characterizes the hysteretic behavior of steel columns at large deformations is scarce. Therefore, the validation and further refinement of new or available steel column deterioration models becomes challenging. This paper discusses the main findings of an extensive experimental program that characterized the hysteretic behavior of wide-flange and hollow structural steel (HSS) columns. The effect of various types of lateral loading protocols on the hysteretic behavior of steel columns was examined with nominally identical specimens. It is shown that a primary failure mode observed in steel columns is the axial shortening. The amount of axial shortening can be considerably different in end columns compared to that observed in interior columns within the same story of a steel moment-resisting frame (MRF). Symmetric loading protocols that are typically used for experimental testing of structural components provide insufficient information for modeling the cyclic deterioration in flexural strength and stiffness of steel columns near collapse. A fiberbased deterioration model is developed for HSS columns that is able to simulate the cyclic hardening prior to the formation of local buckling and the steel column post-buckling behavior including axial shortening. The proposed model is validated with steel column test data that became available from the experimental program.

000018215 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000018215 653__ $$aSteel columns, Collapse experiments, Deterioration modeling, Dynamic instability

000018215 7112_ $$a16th World Conference on Earthquake Engineering$$cSantiago (CL)$$d2017-01-09 / 2017-01-13$$gWCEE16
000018215 720__ $$aLignos, Dimitrios$$iSuzuki, Yusuke
000018215 8560_ $$ffischerc@itam.cas.cz
000018215 8564_ $$s1605686$$uhttps://invenio.itam.cas.cz/record/18215/files/1032.pdf$$yOriginal version of the author's contribution as presented on USB, paper 1032.
000018215 962__ $$r16048
000018215 980__ $$aPAPER