Elghazouli, Ahmed Y.

Evaluation of Loading Protocols for Assessing Local Seismic Demands in Steel Buildings Designed To Ec8

Abstract eng:
A study for the derivation of loading protocols for quasi-static cyclic testing of beam-to-column sub-assemblies of steel buildings designed to modern seismic guidelines is presented in this paper. The adopted methodology follows the general guidelines developed in the US in the early 2000’s for experimental investigations into the cyclic behaviour of steel beamcolumn moment-resisting connections and later incorporated into national standards (e.g. AISC 341-10) and relevant guideline documents (e.g. FEMA 461). In previously published research, loading protocols to be used in cyclic testing have been strongly dependent on the substructure or component to be tested as well as the seismic hazard scenario considered as a basis of experimental programmes. Accordingly, this study focuses on steel building typologies (namely, moment-resisting frames) designed to European codes for medium and high seismicity scenarios, considered representative of the greater European and Middle Eastern region. A large set of non-linear response history analyses was performed on the numerical models of the designed buildings, using an ensemble of ground motions, scaled to match European design spectra. The numerical models used to investigate the seismic performance were developed taking into account the cyclic response of the selected joints, including the stiffness and strength characteristics of the column web panel zones and the connections. Cumulative and maximum rotation demands obtained from the analyses, in terms of inter-storey drift response histories, provided the basis for the derivation of the protocols in order to represent more accurately design earthquake demands and to compare with standardised loading procedures. The results indicate a dependence of the derived load protocol characteristics on the seismic hazard level assumed for the analyses and the quantitative characteristics (e.g. number of significant cycles) of the ground motion records employed. The developed loading protocols are compared with existing and widely-used testing protocols, and recommendations for their use in the assessment of steel framed structures designed to European procedures are put forward.

Contributors:

Tsitos, Antonios

Conference Title:

Proceedings of the 16th World Conference on Earthquake Engineering

Conference Title:

16th World Conference on Earthquake Engineering

Conference Venue:

Santiago (CL)

Conference Dates:

2017-01-09 / 2017-01-13

Rights:

Text je chráněný podle autorského zákona č. 121/2000 Sb.