Abstract The lateral thrust — the total contact force exerted by the buckled core of a buckling-restrained brace (BRB) against its restraining profiles — in bolted all-steel BRBs was studied mainly by means of laboratory tests. The primary purpose was to obtain a better understanding of the “predictability” of the lateral thrust for a given set of boundary conditions. Eleven nominally identical all-steel, reduced-scale BRB samples were subjected to the same cyclic loading, and data were recorded concerning (i) the value of the total lateral thrust, (ii) the relative slip between the buckled core and the restraining surfaces, and (iii) the longitudinal strain at opposite faces of the buckled core. A very high scatter among the peak values of the lateral thrust was observed. The experimental results concerning points (ii) and (iii) were integrated by the results of a refined 3D Finite Element analysis. Very little core-restraining profiles relative slip was observed in the tests. The elastic-plastic core buckling seems to be of the von Karman type, i.e., with simultaneous loading and unloading at the opposite sides of the core.

中文翻译：

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全钢屈曲约束支撑的横向推力：实验和 FEM 结果

摘要 横向推力 - 屈曲约束支撑 (BRB) 的屈曲核心对其约束型材施加的总接触力 - 在螺栓连接的全钢 BRB 中主要通过实验室测试进行研究。主要目的是为了更好地理解一组给定边界条件下横向推力的“可预测性”。11 个名义上相同的全钢、缩小比例的 BRB 样品承受相同的循环载荷，并记录有关 (i) 总横向推力的值，(ii) 屈曲核心和约束表面之间的相对滑移的数据, 和 (iii) 弯曲铁芯相对面的纵向应变。观察到横向推力的峰值之间的非常高的分散。有关点 (ii) 和 (iii) 的实验结果通过精炼的 3D 有限元分析的结果进行整合。在测试中观察到非常小的芯约束轮廓相对滑动。弹塑性核心屈曲似乎是冯卡门类型，即在核心的相对侧同时加载和卸载。