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Asymmetric and Kind of Bracing Effects on Steel Frames Under Earthquake Loads

Authors: Mahmoud Miri, Soliman Maramaee

Abstract:

Because of architectural condition and structure application, sometimes mass source and stiffness source are not coincidence, and the structure is irregular. The structure is also might be asymmetric as an asymmetric bracing in plan which leads to unbalance distribution of stiffness or because of unbalance distribution of the mass. Both condition lead to eccentricity and torsion in the structure. The deficiency of ordinary code to evaluate the performance of steel structures against earthquake has been caused designing based on performance level or capacity spectrum be used. By using the mentioned methods it is possible to design a structure that its behavior against different earthquakes be predictive. In this article 5- story buildings with different percentage of asymmetric which is because of stiffness changes and kind of bracing (x and chevron bracing) have been designed. The static and dynamic nonlinear analysis under three acceleration recording has been done. Finally performance level of the structure has been evaluated.

Keywords: Asymmetric, irregular, seismic analysis, torsion.

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1079086

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References:


[1] Ghobarah Ahmed, "Performance - based design in earthquake engineering, state development", structures, vol. 23, pp878- 884, 2001.
[2] Federal Emergency Management Agency. Guideline for the seismic rehabilitation of building. FEMA273. 1998.
[3] International research center of seismology and seismic engineering, "Guidelines for seismic improvement of existing buildings". Sep. 2002.
[4] Iranian Code of practice for seismic resistant design of building, Building and housing research center publications, Standard No.2800. 3rd Edition. 2006.
[5] Sixth subject of building national provisions: "incoming loads to the building, the office of gathering and promotion of building" national provisions, 2006.
[6] Tenth subject of building national provisions: "designing and performing the steel constructions, the office of gathering and promotion of building" national provisions, 2006.