Ultimate Load of 128 m Large Span Railway Emergency Steel Truss Girder

被引：2
|
作者：
Zhao M. [1 ]
Chen S. [2 ,3 ]
Sun Z. [2 ,3 ]
Xu H. [1 ]
机构：
[1] School of Civil Engineering, Shijiazhuang Tiedao University, Shijiazhuang
[2] State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures, Shijiazhuang Tiedao University, Shijiazhuang
[3] Hebei Engineering Research Center for Traffic Emergency and Guarantee, Shijiazhuang Tiedao University, Shijiazhuang
来源：
Zhongguo Tiedao Kexue/China Railway Science | 2021年 / 42卷 / 05期
关键词：
Damage; Emergency steel truss girder; Large span; Member; Railway; Ultimate load;
D O I：
10.3969/j.issn.1001-4632.2021.05.10
中图分类号：
学科分类号：
摘要：
The nonlinear finite element model of 128 m span railway emergency steel truss girder was established by using software ANSYS. The ultimate load of steel truss girder under different damage conditions such as different member damage locations, different damage lengths and different damage forms was studied. The results show that under non-damage condition, the steel truss girder shows instability failure due to the large deformation of member yielding. The ultimate load coefficient is 2.231 and the safe operation can be ensured. The damage location has great influence on the ultimate load of structure and the closer the damage location is to the mid-span, the greater the influence is. Mid-span is the most unfavorable position for member damage. When the damage degree is large, the strength failure of structure will occur due to the excessive local stress of the member. With the increase of damage length, the ultimate load decreases rapidly at first, then increases slightly and gradually tends to be stable. The greater the damage degree is, the more obvious the influence of damage length on the ultimate load. There are great differences in the influence of damage forms on the ultimate load. The section damage and material yield strength degradation of member have significant influence on the ultimate load, and the influence of material stiffness degradation can be ignored basically. © 2021, Editorial Department of China Railway Science. All right reserved.
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页码：85 / 93
页数：8
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