ANALYSIS AND DESIGN OF STEEL FRAMES CONSIDERING PANEL JOINT DEFORMATIONS

This paper provides insight to the background of the development and r equirements for panel-zone design in the 1986 AISC LRFD specifications . In particular, two criteria for the design of beam-column panel zone s are discussed; the first method is based on the von Mises first-yiel d criterion for the panel-zone web, and the other utilizes the postyie ld shear resistance of the panel derived from the flexural resistance of boundary elements surrounding the panel-zone joint. The nonlinear b ehavior of a moment-resisting frame with panel-zone joints designed ac cording to these two requirements is studied. Lui's 1985 rigorous seco nd-order elastic-plastic hinge analysis is used to assess the performa nce of a frame considering panel-zone deformations. An advanced analys is technique based on a notional-load plastic-hinge approach is introd uced. This advanced analysis technique is used to evaluate the proper design criteria for panel-zone joints in moment-resisting frames, and to study the influence of panel-zone deformations on the frame's limit of resistance. From these studies, the effects of the panel-zone defo rmations on the overall frame resistance can then be summarized and di scussed.