ABSTRACT

In a Hybrid Moment Resisting Frame (HMRF), the hinging sequence is explicitly designed to assure a continuously positive post-yield pushover response. The HMRF shares many of the features of the Special Moment Resisting Frame (SMRF), with the following exceptions:

1. The yielding sequence is set such that the first plastic hinges form at load levels well below the design basis earthquake, and the last hinges form at load levels consistent with the maximum considered earthquake. The inelastic energy dissipation provided through early yielding is expected to improve the performance of the structure to earthquakes of intensity less than the design basis earthquake. The near-elastic response of the late-forming hinges is intended to guarantee a positive pushover response.