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Seismic Design of Steel Frames by Improved Direct Displacement-Based Design Method
An improved direct displacement-based design approach for seismic design of plane steel moment-resisting frames is presented. The improvement stems from the use of a multi-degree-of-freedom equivalent system rather than the original direct displacement-based design method’s single-degree-of-freedom equivalent system. As a result, higher modes and P-Δ effects are evaluated more prudently. The suggested approach utilizes deformation-dependent equivalent modal damping ratios and design modal displacements, which correspond to the first few significant modes, as a function of target inter-storey drift ratios accounting for different performance levels. After combining a-compatible with various damping ratios-displacement design spectrum with the equivalent modal damping ratios and design modal displacements, one may calculate the necessary modal periods, stiffnesses and shear forces at the base. Through a modal combination rule, the base shear is computed and properly distributed to all storey levels. Via a numerical example of a 15 storey moment resisting frame, the benefits of the proposed method are highlighted.
Seismic Design of Steel Frames by Improved Direct Displacement-Based Design Method
An improved direct displacement-based design approach for seismic design of plane steel moment-resisting frames is presented. The improvement stems from the use of a multi-degree-of-freedom equivalent system rather than the original direct displacement-based design method’s single-degree-of-freedom equivalent system. As a result, higher modes and P-Δ effects are evaluated more prudently. The suggested approach utilizes deformation-dependent equivalent modal damping ratios and design modal displacements, which correspond to the first few significant modes, as a function of target inter-storey drift ratios accounting for different performance levels. After combining a-compatible with various damping ratios-displacement design spectrum with the equivalent modal damping ratios and design modal displacements, one may calculate the necessary modal periods, stiffnesses and shear forces at the base. Through a modal combination rule, the base shear is computed and properly distributed to all storey levels. Via a numerical example of a 15 storey moment resisting frame, the benefits of the proposed method are highlighted.
Seismic Design of Steel Frames by Improved Direct Displacement-Based Design Method
Lecture Notes in Civil Engineering
Mazzolani, Federico M. (editor) / Dubina, Dan (editor) / Stratan, Aurel (editor) / Kalapodis, Nicos A. (author) / Muho, Edmond V. (author) / Beskos, Dimitri E. (author)
International Conference on the Behaviour of Steel Structures in Seismic Areas ; 2022 ; Timisoara, Romania
Proceedings of the 10th International Conference on Behaviour of Steel Structures in Seismic Areas ; Chapter: 119 ; 1072-1080
2022-05-08
9 pages
Article/Chapter (Book)
Electronic Resource
English
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