Seismic Design Of Eccentrically Braced Frames With Middle Link Beam Using Energy Based Method
The use of energy, as means to derive seismic design forces, to design eccentrically braced frames with a moment link, is presented in this paper. The ultimate design forces are derived from input energy for a selected design pseudovelocity spectrum, a selected plastic yield mechanism, a selected target deformation level, and a selected plastic angle of link beam. This method eliminates the need for a drift check after the structure is designed for strength. This method can lead to a desirable yield mechanism for structures in an ultimate state. For comparison between the seismic response of structures designed with an equivalent static method and an energy-based method, a 10 story frame is designed considering the above two methods, from which, the results from nonlinear analyses of the frames, are compared. The results indicate that a design by an energy-based method can lead to more dissipation of input energy and more ductility of structures.
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