Analyses on the Effectiveness of Structural Measures on Frame Beam End for "Strong Column and Weak Beam" Failure Mode

Abstract eng:
"Strong column and weak beam" is one of the key control measures in structural seismic design. It is committed to adjusting the distribution pattern of plastic hinges of structure under rare earthquake, and the plastic hinges are expected to appear at the end of the beam, plastic hinges are avoided appearing at the end of column except the bottom column. So it is necessary to make a thorough analysis. This paper makes dynamic elastic-plastic and static analyses of three various slotting methods and general two-story (2×2) frame structures, and studies the seismic performance of each model via mechanical analysis and numerical analysis method by ABAQUS results indicate that compared with general frame, when adopting the three slotting methods proposed in this paper: little changes in the bearing capacity reserves of the structure, deformation capacity reserve increases, and the seismic performance improves; under the impact of seismic waves, the degree of damage of concrete at beam ends increases, that at column ends and joint decreases, plastic hinging appears earlier at beam ends than column ends, a higher degree of plastic hinging development appears at beam ends than column ends, which is more consistent with the "strong column-weak beam" failure mode in the code.

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