A Comparison of the Krawinkler and Scissors Models for Including Beam-Column Joint Deformations in the Analysis of Moment-Resisting Steel Frames

摘要

The significance of beam-column joint deformations on the overall flexibility of steel moment resisting frames has been known for some time (Bertero, Popov, and Krawinkler, 1972; Becker, 1975). This is true for elastic response and particularly for inelastic response when shear yielding occurs in the panel zone region of the joint. Structural analysis should always include such deformations. This point is clearly stated in the latest design provisions for seismic analysis and design of structures (ASCE, 2002; FEMA, 2000; FEMA, 2004). Unfortunately, these provisions provide no explicit recommendations for mathematical modeling of the joint, even when the joint remains elastic.