Scalar and Vector-Im-Based Drift Hazard Estimations for Steel Buildings With Alternative Framing Configurations


Abstract eng:
Distinct structural systems prevail in different regions of the world depending on the construction skills, history and industrial context of each particular community. Japanese engineers have usually adopted a two-way layout consisting of 3D beam-column assemblages designed to resist seismic and gravity loads simultaneously. By contrast, American and European seismic codes differentiate clearly between primary and secondary lateral resisting systems and seek to provide adequate seismic strength and ductility to the primary frames while the secondary (or gravity) frames are designed to carry gravity loads only. This study examines the seismic performance of steel buildings with alternative framing systems subjected to bi-directional ground-motion. Peak drifts of one-way and two-way frames are assessed by means of scalar and vector-valued probabilistic methods. Extensive non-linear response history analyses over idealized 3D structures representing 6- and 9-storey buildings are performed under pairs of linearly scaled ground-motions. Both far-field and nearfield non-pulselike acceleration series are considered. This study shows that incorporating a spectral shape parameter into the IM-vector reductions of up to 40 % can be obtained on conditional standard deviations when assessing bi-directionally loaded 3D buildings. The effects of alternative framing systems on structural fragilities are found to differ depending on the number of storeys. For 6-storey structures, consistently higher capacities are observed in two-way layouts with respect to one-way systems as well as increasing variabilities at larger demand levels. Finally, drift hazard curves are calculated by combining the building fragilities with idealized ground-motion hazard estimates. The results indicate that one-way buildings experience consistently lower drift exceedance rates regardless of the ground-motion type, especially for drift levels larger than 2 % although the differences are larger for the 9-storey frames in comparison with their 6-storey counterparts.

Contributors:
Conference Title:
Conference Title:
16th World Conference on Earthquake Engineering
Conference Venue:
Santiago (CL)
Conference Dates:
2017-01-09 / 2017-01-13
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Text je chráněný podle autorského zákona č. 121/2000 Sb.



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 Record created 2017-01-18, last modified 2017-01-18


Original version of the author's contribution as presented on USB, paper 3564.:
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