新型开孔三重方(矩)形钢管屈曲约束支撑性能分析

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中图分类号：TU352.1 文献标志码：A 文章编号：1000-0844（2025）05—1128—11

Abstract： Using ABAQUS software，cyclic loading tests were performed on a perforated triple rectangular steel tube buckling-restrained brace （PTRBRB） to investigate its mechanical properties，energy dissipation capacity，and the effects of perforation location， number of perforations， perforation ratio，spacing between steel tubes，and end connection type on its performance. The results demonstrate that the PTRBRB exhibits a rational structural design，full hysteretic curves with good symmetry and stability， and clear advantages in designated yielding and simultaneous multipoint energy dissipation. For PTRBRB with web perforations，the number of perforations， end connection method，and spacing between steel tubes exhibit negligible impact on mechanical and energy dissipation performance. Variations in perforation ratio affect mechanical properties but not energy dissipation capacity. Specimens with very low ratios show maximum equivalent plastic strain at the end connections，whereas those with excessively high ratios experience inplane instability at the core unit openings. Conversely，edge perforations result in less stable hysteretic curves and reduced energy dissipation capacity and compressive load-bearing capacity. Therefore，web perforations with a perforation ratio of 35%-50% are recommended for optimal performance.

Keywords： buckling-restrained brace （BRB）； perforations; mechanical properties； hystereticperformance;finite element method

0 引言

屈曲约束支 撑（Buckling-RestrainedBrace，BRB）[1-3]是一种在拉力和压力作用下只屈服而不屈曲的新型高性能消能构件。（剩余10812字）