Study on the Seismic Behavior of Eccentrically Braced Steel Frames of Replaceable Shear Links With Web Opening

Abstract

The replaceable energy-dissipating beam is convenient for post-earthquake repair and reinforcement or direct replacement. A quasi-static test study of an eccentrically supported steel frame with replaceable energy dissipating beam sections was performed, and the hysteretic performance and failure mode of the eccentrically supported steel frame with replaceable energy dissipative beam sections were obtained. Based on the test results, the structure of the energy dissipating beam segment was improved, and a number of K-shaped eccentric support frame finite element models for the web opening ratios of different energy dissipating beam segments were established. Nonlinear numerical analysis was performed on its hysteretic performance. The research shows that the finite element analysis is in good alignment with the test results. The opening of the web in the energy-consuming beam segment can effectively reduce the stress level of the frame beam and ensure that large plastic deformation occurs within the energy-consuming beam segment. With the increase of the opening ratio, the ultimate bearing capacity, initial stiffness and energy consumption of the frame have all shown a downward trend. The research provides a basis for the seismic design of similar structures and can guide the design of related projects.

Column Link Behavior in Eccentrically Braced Composite 3-Dimensional Frames

“…The analysis of column links in 3-dimensional steel concrete composite frames with X-and V-type bracing systems across buildings with 5, 10, and 15 stories is a unique contribution to the field. Previous works by [18,22,[27][28][29] have solely focused on vertical links, whereas this study emphasizes the provision of eccentric column links.…”