冷弯薄壁型钢组合截面构件试验研究与数值模拟

EXPERIMENTAL REASEARCH AND NUMERICAL ANALYSIS ON THE COMBINATION EFFECTS OF COLD-FORMED STEEL SPECIMENS

通过三根组合截面构件的静力、动力试验研究和有限元数值模拟,与对应的两根单肢构件对比,通过承载力、刚度、延性等基本参数,充分的反映出组合作用对构件性能的提高,并考虑了组合形式的影响。最后,对冷弯薄壁型钢组合截面构件的屈曲行为和破坏机理进行深入分析,总结出此类构件静力、动力破坏的特点和实质。研究得出:组合作用对构件静力性能提升明显;组合形式影响构件的屈曲形式;板件侧向支撑的失稳是构件破坏的原因,而滞回性能的退化则是由于塑性局部屈曲的过早发生。

Three combined specimens are experimentally studied and analyzed by FEM. Compared with the corresponding single members, it is clearly proved that the combination effects, with different combination forms, significantly improve the performance of members according to the observed enhancement in bearing capacity, stiffness and ductility. In addition, the buckling behavior and destruction mechanism are investigated, and the characteristics and mechanism of thin-walled member＇s destruction under static and hysteretic loads are discussed. The following conclusions can be made： the combination effects improve the static performance, which is influenced by the combination form; Failure under static force is caused by the buckling of sideway supports; The degradation of hysteretic performance is mainly because of the plastic local buckling.