cycle, and the magnitudes of local stress concentrations. （3）疲劳设计出考虑容许应力外还应考虑节点的位置。
Designing against fatigue involves a consideration of joint arrangement as well as of permissible stress.
（4）结构钢不总是表现出延性特性，在有些情况下，即使名义拉应力很低，突然的、灾难性的断裂也会发生。
Structural steel does not always exhibit a ductile behavior, and under some circumstances sudden and catastrophic fracture may occur, even though the nominal tensile stresses are low.
（5）结构刚的延性取决于钢材的组成、热处理方法和钢材的厚度，并且随温度和应变率的变化而变化。
The ductility of a structural steel depends on its composition, heat treatment, and thickness, and varies with temperature and strain rate.
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