...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Engineering Structures >Effects of the axial force eccentricity on the time-variant structural reliability of aging r.c. cross-sections subjected to chloride-induced corrosion
【24h】

Effects of the axial force eccentricity on the time-variant structural reliability of aging r.c. cross-sections subjected to chloride-induced corrosion

机译：轴向力偏心率对时效r.c.的时变结构可靠性的影响经受氯化物腐蚀的横截面

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Reinforced concrete structures are generally affected by degradation phenomena, which may include changes in strength and stiffness beyond the baseline conditions which are assumed in structural design. Some of these aging effects may cause component or system strengths to degrade over time, particularly when the concrete is exposed to an aggressive environment which may increase the risk of structural failure. For r.c. structures, due to the uncertainties in material and geometrical properties, in the magnitude and distribution of the loads, in the physical parameters which define the deterioration process, the structural safety should realistically be considered time-variant. In this context, this paper implements a computational probabilistic approach to predict the time-evolution of the mechanical and geometrical properties of a r.c. structural element (i.e., bridge pier) subjected to corrosion-induced deterioration as a consequence of the diffusive attack of chlorides in order to evaluate its service life. Adopting appropriate degradation models of the material properties, concrete and reinforcing steel, as well as assuming appropriate probability density functions related to mechanical and deterioration parameters, the proposed sectional approach is based on Monte Carlo simulations in order to evaluate time-variant axial force bending moment resistance domains, with the aim to estimate the time-variant reliability index beta for different axial force eccentricity values. Finally, an application of the proposed methodology to estimate the expected lifetime of a deteriorating r.c. bridge pier is described and discussed. (C) 2016 Elsevier Ltd. All rights reserved.
机译：钢筋混凝土结构通常会受到退化现象的影响，退化现象可能包括强度和刚度的变化超出结构设计中假定的基准条件。这些老化效应中的一些可能会导致组件或系统强度随时间降低，尤其是当混凝土暴露于侵蚀性环境时，这可能会增加结构破坏的风险。对于RC对于结构，由于材料和几何特性的不确定性，载荷的大小和分布以及定义劣化过程的物理参数的不确定性，实际上应将结构安全性视为随时间变化的。在这种情况下，本文采用了一种计算概率方法来预测钢筋混凝土力学和几何特性的时间演化。结构元素（即桥墩）由于氯化物的扩散侵蚀而遭受腐蚀引起的劣化，以评估其使用寿命。通过采用适当的材料特性，混凝土和钢筋性能退化模型，并假设与机械和退化参数相关的适当概率密度函数，所提出的截面方法基于蒙特卡洛模拟，以评估随时间变化的轴向力弯矩阻力域，目的是估计不同轴向力偏心值的时变可靠性指标β。最后，将所提出的方法应用于估算不断恶化的RC的预期寿命。对桥墩进行了描述和讨论。 （C）2016 Elsevier Ltd.保留所有权利。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号