A Study on Fracture-Governed Deformation Capacity of Steel Structural Members under Random Amplitudes

在强烈地震的袭击下，钢结构建筑的结构构件容易断裂，正如1995年阪神地震中所报道的那样。断裂可能对建筑物的安全造成致命的损失。地震运动使钢结构构件经历随机振幅的循环变形，在此过程中引发断裂。本研究对这种随机幅值下的断裂前加载周期和变形能力进行了实验研究，并提出了评估方法。应用这些方法进行抗震设计，可以使钢结构建筑在未来的大地震中不发生断裂。

Structural members in steel-framed buildings are susceptible to fracture during the attack of severe earthquake, as reported about the building damages in Kobe at the 1995 Hyogoken-Nambu Earthquake. The fracture possibly causes the fatal loss of safety of buildings. Earthquake motions make steel structural members experience cyclic deformations with random amplitudes, during which the fracture is triggered. In this study, pre-fracture loading cycles and deformation capacity under such random amplitudes were experimentally investigated and the evaluation methods were proposed. Applying these methods, the seismic design will be able to develop steel-framed buildings free from fracture at the future-coming events of big earthquakes.