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首页> 外文期刊>Tunnelling and underground space technology >Cyclic loading behavior of a repaired subway station after fire exposure
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Cyclic loading behavior of a repaired subway station after fire exposure

机译：修复后的地铁站着火后的循环荷载行为

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摘要

After a fire, underground concrete structures, specifically in subway stations, are often repaired and reused rather than demolished. The mechanical performances of a structure after being exposed to fire require intensive evaluation before a station is reopened. This paper describes the mechanical behavior of a post-fire subway station structure by means of a structural test. A large-scale slab-column/wall structure was exposed to fire. After one of the columns damaged by fire was repaired, a combination of constant vertical load and cyclic lateral load was applied on the repaired structure. A cyclic pushover test was carried out to discover the mechanical behavior of the post-fire structure under soil pressures and service loads. Damage was accumulated as cyclic loadings increased until the structure failed due to shear crushing of the repaired column. The hysteretic loops of the entire structure were thin, indicating that fire exposure decreased the energy dissipation. Results show that the fire caused substantial damage to the structure, resulting in reduced load bearing capacity, deformation capacity, and seismic resistance.
机译：发生火灾后，地下混凝土结构，特别是地铁站中的地下混凝土结构，经常被修理和重新使用，而不是被拆除。建筑物着火后的机械性能需要重新评估，然后才能重新开放。本文通过结构测试描述了火灾后地铁车站结构的力学行为。大型楼板-柱/墙结构暴露于火中。修复其中一个被火损坏的圆柱后，将恒定的竖向荷载和周期性的侧向荷载共同施加到修复的结构上。进行了一次循环推覆试验，以发现后土结构在土壤压力和使用载荷下的力学性能。随着循环载荷的增加，损伤不断累积，直到由于修复的柱子的剪切破碎导致结构失效。整个结构的磁滞回线很细，表明着火减少了能量耗散。结果表明，火灾严重破坏了结构，导致承载能力，变形能力和抗震性下降。

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  • 来源
    《Tunnelling and underground space technology》 |2019年第2期|210-217|共8页
  • 作者

    Zhao Huiling; Yu Haitao; Yuan Yong; Li Pan; Chen Juntao;

  • 作者单位

    Shanghai Univ, Dept Civil Engn, Shanghai 200072, Peoples R China|Tongji Univ, State Key Lab Disaster Reduct Civil Engn, Shanghai 200092, Peoples R China;

    Tongji Univ, Minist Educ, Key Lab Geotech & Underground Engn, Shanghai 200092, Peoples R China|Shanghai Municipal Engn Design Inst Grp Co Ltd, Shanghai 200092, Peoples R China;

    Tongji Univ, State Key Lab Disaster Reduct Civil Engn, Shanghai 200092, Peoples R China;

    Soochow Univ, Sch Rail Transportat, Suzhou 215131, Jiangsu, Peoples R China;

    Tongji Univ, Dept Geotech Engn, 1239 Siping Rd, Shanghai 200092, Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Underground structures; Post-fire; Cyclic pushover test; Mechanical behavior; Damage evaluation;

    机译：地下结构;射击后;循环下垂试验;力学性能;损伤评估;

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