Extension and verification of an energetic fatigue model for concrete under dynamic compressive loading

动压荷载下混凝土能量疲劳模型的推广与验证

基本信息

  • 批准号:
    270042017
  • 负责人:
  • 金额:
    --
  • 依托单位:
  • 依托单位国家:
    德国
  • 项目类别:
    Research Grants
  • 财政年份:
    2014
  • 资助国家:
    德国
  • 起止时间:
    2013-12-31 至 2017-12-31
  • 项目状态:
    已结题

项目摘要

Structures for wind turbines as well as railway or highway bridges are high-dynamically stressed. The dynamic stresses are leading in concrete, as well as in other materials, to deformation and damage processes, which can end in the collapse of the structure. These deformation and damage processes are called in general as material fatigue.Although the main part of the above mentioned structures are built out of concrete no consistent model to describe the occurring deformation and damage processes in concrete under cyclic loading exists. In literature published material models are neither sufficiently validated nor consider the influence of concrete creep, which occurs inevitably in parallel with the cyclic stresses.The submitted research project aims to expand an existing fatigue model for concrete, which is taken from literature. It is considered to be one of the most promising models for describing concrete fatigue. The extension consists in particular the acquisition of concrete creep. Therefore extensive experiments will be performed on small-scale concrete specimens to separate the deformation and damage processes resulting of cyclic loading from creep deformation processes. In addition, a creep-relevant stress levels will be determined as a function of the cyclic stress values.The extended fatigue model will conclusively verified in the course of systematically coordinated experimental programs on the basis of the experimental results. In future this should give the opportunity to depict the fatigue processes of concrete beams or structures by keeping fatigue and creep processes into consideration. The resulting model enables to consider stress redistributions in cyclically loaded concrete structures and components and to utilize unused system resources.
风力涡轮机以及铁路或公路桥梁的结构具有高动态应力。动态应力导致混凝土以及其他材料的变形和损坏过程,这可能导致结构的倒塌。虽然上述结构的主体部分都是混凝土结构,但在循环荷载作用下混凝土的变形和损伤过程还没有统一的模型来描述。在文献中发表的材料模型既没有充分验证,也不考虑混凝土徐变的影响,这不可避免地发生在平行的循环stresss.The提交的研究项目的目的是扩大现有的混凝土疲劳模型,这是从文献中。它被认为是描述混凝土疲劳的最有前途的模型之一。该扩展尤其包括混凝土徐变的获取。因此,将在小尺寸混凝土试件上进行广泛的实验,以将循环荷载引起的变形和损伤过程与徐变变形过程分开。此外,蠕变相关的应力水平将被确定为循环应力值的函数。扩展的疲劳模型将最终验证的过程中,系统协调的实验方案的实验结果的基础上。在未来,这应该有机会描绘混凝土梁或结构的疲劳过程,保持疲劳和蠕变过程考虑在内。由此产生的模型能够考虑在循环加载的混凝土结构和组件的应力重新分布,并利用未使用的系统资源。

项目成果

期刊论文数量(2)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
A strain model for fatigue‐loaded concrete
疲劳加载混凝土的应变模型
  • DOI:
    10.1002/suco.201700029
  • 发表时间:
    2018
  • 期刊:
  • 影响因子:
    3.2
  • 作者:
    Christoph von der;Steffen
  • 通讯作者:
    Steffen
Ein additives Dehnungsmodell für ermüdungsbeanspruchten Beton
疲劳应力混凝土的附加应变模型
  • DOI:
    10.1002/best.201600048
  • 发表时间:
    2017
  • 期刊:
  • 影响因子:
    0
  • 作者:
    von der Haar
  • 通讯作者:
    von der Haar
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Professor Dr.-Ing. Steffen Marx其他文献

Professor Dr.-Ing. Steffen Marx的其他文献

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{{ truncateString('Professor Dr.-Ing. Steffen Marx', 18)}}的其他基金

Numerical and experimental investigations on stress redistributions of fatigue loaded concrete structures in the very high-cycle fatigue range
超高周疲劳范围内疲劳荷载混凝土结构应力重新分布的数值和实验研究
  • 批准号:
    417209030
  • 财政年份:
    2019
  • 资助金额:
    --
  • 项目类别:
    Research Grants
Causes and modelling of the warming of fatigue-loaded concrete
疲劳混凝土升温的原因和模型
  • 批准号:
    342801069
  • 财政年份:
    2017
  • 资助金额:
    --
  • 项目类别:
    Research Grants
Design methodology for cross-life structural health monitoring with unknown damage process
损伤过程未知的跨寿命结构健康监测设计方法
  • 批准号:
    501808860
  • 财政年份:
  • 资助金额:
    --
  • 项目类别:
    Priority Programmes
Success and Failure: On the Contribution of Recognised Failures to the Development of Prestressed Concrete Construction
成功与失败:论公认的失败对预应力混凝土施工发展的贡献
  • 批准号:
    525823116
  • 财政年份:
  • 资助金额:
    --
  • 项目类别:
    Priority Programmes
Coordination Funds
协调基金
  • 批准号:
    501804558
  • 财政年份:
  • 资助金额:
    --
  • 项目类别:
    Priority Programmes
Influence of stress rate and load frequency on the fatigue resistance of concrete
应力率和荷载频率对混凝土抗疲劳性能的影响
  • 批准号:
    433963337
  • 财政年份:
  • 资助金额:
    --
  • 项目类别:
    Research Grants

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