铁路钢桥承受的载荷是往复的交变荷载，其主要的破坏形式之一是疲劳和断裂。
The loads on railway steel Bridges are repetitive, the fatigue and fracture are the main reasons that engineering constructions lose their capability.
混凝土腐蚀疲劳破坏是腐蚀介质与交变荷载耦合作用的结果，对其研究目前国内外还仅处于理论探索阶段。
Corrosion fatigue damage of concrete is the coupling action result of corrosion medium and load fatigue, and the study on this has been in the stage of theory search.
部分预应力混凝土梁中的非预应力钢筋在反复运行荷载作用下承受交变应力。
The non—prestressed steel bars in ppc beams endure alternate stress under the repeated service loading.
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