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Efficient seismic fragility assessment of highway bridges on liquefiable soils.

机译:液化土壤中公路桥梁的有效地震脆性评估。

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摘要

The increasing failure potential of U.S. highway bridges from aging and susceptibility to damage in extreme events, such as earthquakes, necessitates the development of efficient assessment tools to help infrastructure owners prioritize maintenance and rehabilitation interventions. Particularly, seismic fragility curves are useful tools because they state the failure probability of structures conditioned on earthquake intensity levels. This study focuses on computationally efficient coupled bridge-soil-foundation (CBSF) analyses and develops fragility curves for multi-span continuous steel bridges (MSCS) typical of the central and eastern U.S. (CEUS) when exposed to earthquake-induced soil liquefaction. The resulting fragility curves show an increase in the vulnerability of rocker bearings and bent piles. Moreover, depending on the type of soil layer overlying the liquefiable sand, liquefaction either decreases or increases the fragility of columns, whereas the probability of unseating at the abutments increases when liquefaction is explicitly modeled. Lastly, bridge system fragilities are increased for extensive and complete damage.
机译:美国公路桥梁从老化和敏感性到地震等极端事件中损坏的可能性不断增加,因此有必要开发有效的评估工具来帮助基础设施所有者优先进行维护和修复措施。特别是,地震脆性曲线是有用的工具,因为它们指出了以地震烈度为条件的结构的破坏概率。这项研究的重点是计算效率高的桥梁-土壤基础(CBSF)分析,并针对暴露于地震诱发的土壤液化的美国中部和东部(CEUS)典型的多跨连续钢桥(MSCS)绘制了脆性曲线。所得的脆性曲线表明摇杆轴承和弯曲桩的脆弱性增加。此外,根据液化砂上覆的土壤层的类型,液化会降低或增加柱的脆性,而当明确模拟液化时,基台的不固定概率会增加。最后,桥梁系统的脆弱性增加,造成广泛而完全的损坏。

著录项

  • 作者

    Aygun, Bayram.;

  • 作者单位

    Rice University.;

  • 授予单位 Rice University.;
  • 学科 Engineering Civil.
  • 学位 M.S.
  • 年度 2009
  • 页码 99 p.
  • 总页数 99
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 建筑科学;
  • 关键词

  • 入库时间 2022-08-17 11:38:26

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