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Seismic Resistant Configurations for Concentrically Braced Frames
The present paper intends to point out some features of different bracing configurations used frequently in concentrically braced frames located in seismic areas. Four concentrically braced frames with six and ten storeys (eight in total) were sized for the same seismic action evaluated according to the prescriptions of EN 1998-1:2004 and the in charge Romanian seismic design code. Four concentrically bracing configurations frequently used in seismic resistant structures were analysed: ascending bracing, descending bracing, X bracing and “2 storey - X” bracing. All analysed frames had two spans of 6.0 m and a storey height of 3.5 m.
The behaviour of the frames during dynamic nonlinear analyses was compared. Three base excitations of Vrancea earthquakes were considered, recorded in or around Bucharest at 04.03.1977; 31.08.1986 and 30.05.1990. All considered acceleration records were calibrated to a peak ground acceleration value of about 0.3 times the acceleration of gravity. Damping was taken into account using the Rayleigh procedure.
The history of the formation of plastic hinges was observed. The maximum values for axial forces, bending moments and inelastic deformations recorded in different member types, the extreme values of horizontal displacements and base shear forces were compared. Another objective was the comparison of the estimated steel consumption.
Seismic Resistant Configurations for Concentrically Braced Frames
The present paper intends to point out some features of different bracing configurations used frequently in concentrically braced frames located in seismic areas. Four concentrically braced frames with six and ten storeys (eight in total) were sized for the same seismic action evaluated according to the prescriptions of EN 1998-1:2004 and the in charge Romanian seismic design code. Four concentrically bracing configurations frequently used in seismic resistant structures were analysed: ascending bracing, descending bracing, X bracing and “2 storey - X” bracing. All analysed frames had two spans of 6.0 m and a storey height of 3.5 m.
The behaviour of the frames during dynamic nonlinear analyses was compared. Three base excitations of Vrancea earthquakes were considered, recorded in or around Bucharest at 04.03.1977; 31.08.1986 and 30.05.1990. All considered acceleration records were calibrated to a peak ground acceleration value of about 0.3 times the acceleration of gravity. Damping was taken into account using the Rayleigh procedure.
The history of the formation of plastic hinges was observed. The maximum values for axial forces, bending moments and inelastic deformations recorded in different member types, the extreme values of horizontal displacements and base shear forces were compared. Another objective was the comparison of the estimated steel consumption.
Seismic Resistant Configurations for Concentrically Braced Frames
Lecture Notes in Civil Engineering
Mazzolani, Federico M. (editor) / Dubina, Dan (editor) / Stratan, Aurel (editor) / Marcu, Ramona (author) / Köber, Helmuth (author)
International Conference on the Behaviour of Steel Structures in Seismic Areas ; 2022 ; Timisoara, Romania
2022-05-08
8 pages
Article/Chapter (Book)
Electronic Resource
English
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