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This study presents an energy approach to the performance-based seismic design of steel moment resisting frames for the basic safety objective. The seismic demand is expressed in terms of hysteresis energy and its distribution along the height of the frame, based on an associated study. The resistance of a steel moment-resisting frame to such demand is presented in the form of energy dissipation capacities of critical members, based on the previous experimental studies on full-scale moment-connections. An energy-based design methodology is proposed for performance-based earthquake resistant design. The proposed design method is examined using design examples and the results are discussed.

The present paper investigates the seismic energy demand in steel moment-resisting -frames. The frames, with 3, 6 and 10 storeys, and 4 and 8 spans, are designed according to current seismic code provisions. The energy response (energy quantities and their distributions) in the frames subjected to an ensemble of six earthquake ground motions recorded on different soil conditions, is investigated by nonlinear time history analysis. The study condudes that (1) the results of e n e r a response can be developed into a r* tional method of seismic evaluation and design for steel moment-resisting frames; (2) the energy concept based on the single-degree-of-freedom has limitations when extended to the realistic structural system for design purposes; and (3) it is necessary to develop the enerw-based approach for seismic evaluation and design based on the seismic response of a realistic multi-degree-of-freedom structural system.

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