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Seismic Design of Plane Steel Frames Using Modal Strength Reduction (Behaviour) Factors
A new method for the seismic design of plane steel moment resisting frames is developed. The method is based on the determination of the maximum seismic structural response through spectrum analysis utilizing different values of the strength reduction (behaviour) factor for the first few significant modes. These modal strength reduction factors are derived with the aid of (a) design equations that provide equivalent modal damping ratios for steel moment resisting plane frames as functions of period, allowable interstorey drift and damage levels and (b) damping reduction factors that modify elastic acceleration spectra for high levels of damping. One can use these modal reduction factors in conjunction with a design spectrum and modal synthesis tools to calculate the design forces of a steel framed structure. By performing seismic designs of a steel frame it is demonstrated that the use of modal strength reduction factors instead of a single value for that factor for all modes, as it is the case with current seismic codes, leads to more accurate results in a more rational way.
Seismic Design of Plane Steel Frames Using Modal Strength Reduction (Behaviour) Factors
A new method for the seismic design of plane steel moment resisting frames is developed. The method is based on the determination of the maximum seismic structural response through spectrum analysis utilizing different values of the strength reduction (behaviour) factor for the first few significant modes. These modal strength reduction factors are derived with the aid of (a) design equations that provide equivalent modal damping ratios for steel moment resisting plane frames as functions of period, allowable interstorey drift and damage levels and (b) damping reduction factors that modify elastic acceleration spectra for high levels of damping. One can use these modal reduction factors in conjunction with a design spectrum and modal synthesis tools to calculate the design forces of a steel framed structure. By performing seismic designs of a steel frame it is demonstrated that the use of modal strength reduction factors instead of a single value for that factor for all modes, as it is the case with current seismic codes, leads to more accurate results in a more rational way.
Seismic Design of Plane Steel Frames Using Modal Strength Reduction (Behaviour) Factors
Geotechnical,Geological
Fardis, Michael N. (editor) / Papagiannopoulos, George A. (author) / Beskos, Dimitri E. (author)
2010-06-12
9 pages
Article/Chapter (Book)
Electronic Resource
English
Seismic Design of Plane Steel Frames Using Modal Strength Reduction (Behaviour) Factors
| British Library Conference Proceedings | 2010
Modal strength reduction factors for seismic design of plane steel braced frames
| British Library Online Contents | 2018