Mociran, H.A.

Influence of 2D versus 3D modeling on the seismic performance of dual eccentrically braced steel frames

Abstract eng:
The main aim of this research is to study the influence of 2D versus 3D modeling on the seismic response of dual eccentrically braced steel frames with short links. A seven story frame office building with a symmetric square plan was considered for this purpose. The perimeter Moment Resisting Frames (MRFs) are eccentrically braced in the middle bays, being dual frames, whilst the internal frames are MRFs. The building is located in Bucharest and was designed based on Romanian seismic design code (P100-1 2013) and EN 1993-1-1 (2005), considering the dissipative behavior. The perimeter dual frames were modeled in two cases: as a part of the 3D building and as 2D structures. The structures were subjected to a set of seven semi-artificial accelerograms of Vrancea 1977 type. The average peak response of the dual frames modeled as 2D structure is compared with the more realistic response of the same frames being part of the 3D building. The comparisons are made in terms of inter-story drifts, links rotations and absolute story accelerations. The results of this research highlight that modeling the dual frames as 2D frames significantly overrate the seismic response and lead to very conservative design.

Contributors:

Popa, A.G.

Publisher:

Taylor and Francis Group, London, UK

Conference Title:

Insights and Innovations in Structural Engineering, Mechanics and Computation

Conference Title:

Sixth International Conference on Structural Engineering, Mechanics and Computation

Conference Venue:

Cape Town, South Africa

Conference Dates:

2016-09-05 / 2016-09-07