论文部分内容阅读
为了研究由热轧碳钢、冷弯碳钢、冷弯不锈钢三种材料所构成的管状支撑构件的响应,在轴向循环荷载下,进行了16个方形、长方形空心截面构件的试验,对三种材料试件的荷载-位移滞回响应、抗压强度、侧向挠度、能量耗散、断裂寿命进行研究。此外,采用有限元模型验证试验结果,并基于应变破坏预测方法进行参数研究。研究表明:现有的预测抗压屈曲、屈曲后抗压强度的经验公式可同时用于碳钢和不锈钢试件。然而,构件延性和长细比之间的关系不能代表整体的长细比,亦不能用于冷弯不锈钢构件。对于每种材料,考虑整体和局部长细比,提出新的公式。对于不同的材料,整个加载周期的切线刚度不同,这是决定局部屈曲阻力、循环次数、支撑破坏的关键因素。
In order to study the response of the tubular support members consisting of hot-rolled carbon steel, cold-formed carbon steel and cold-formed stainless steel, 16 square and rectangular hollow members were tested under axial cyclic loading, The load-displacement hysteretic response, compressive strength, lateral deflection, energy dissipation and fracture life of specimens were studied. In addition, the finite element model was used to verify the experimental results and to study the parameters based on the strain failure prediction method. The results show that the existing empirical formulas for predicting compressive buckling and compressive strength after buckling can be used for both carbon steel and stainless steel specimens. However, the relationship between ductility and slenderness does not represent the overall slenderness ratio nor can it be used to cold-bend stainless steel components. For each material, a new formula is proposed considering the global and local slenderness ratio. For different materials, the tangential stiffness of the entire loading cycle is different, which is the key factor that determines the local buckling resistance, the number of cycles, and the support destruction.