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Probabilistic indicator to classify the failure mode of reinforced-concrete columns

机译：概率指示器分类钢筋混凝土柱的故障模式

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摘要

In order to reconcile the large dispersion in classifying the failure mode of reinforced-concrete (RC) columns, a probabilistic indicator was developed by comparing the flexural strength with the shear strength. Specifically, a simplified truss-and-arch model was first built to develop the flexural strength model and shear strength model of RC columns to derive an explicit expression for the probabilistic indicator. The five unknown model parameters in the explicit expression were then carefully defined as random variables to represent the prevailing uncertainties with prior distribution ranges from 0 to 1.0. An experimental database was constructed to estimate the posterior cumulative distribution of the five unknown model parameters by comparing the measured strengths. Moreover, by defining unity as the threshold value of the probabilistic density function of the probabilistic indicator, the probability categorising the damage of RC columns into a specific failure mode was determined for each specimen. Finally, as a by-product of developing the probabilistic indicator, a closed-form expression of a probabilistic model in terms of a mean prediction model and a standard deviation prediction model was developed for engineers to estimate the required minimum transverse reinforcement ratio of RC columns.
机译：为了在分类钢筋混凝土（RC）柱的故障模式方面可以调和大型分散，通过将抗弯强度与剪切强度进行比较，开发了概率指示器。具体地，首先构建了简化的桁架和拱形模型，以开发RC列的弯曲强度模型和剪切强度模型，从而导出概率指标的明确表达。然后将显式表达式中的五个未知模型参数仔细定义为随机变量，以表示具有先前分配的主要不确定性范围为0至1.0。构建实验数据库以通过比较测量的强度来估计五个未知模型参数的后累积分布。此外，通过将统一定义为概率指示器的概率密度函数的阈值，针对每个样本确定将RC列损坏分类为特定故障模式的概率。最后，作为开发概率指示器的副产物，为工程师开发了在平均预测模型和标准偏差预测模型方面的概率模型的闭合形式表达，以估计RC柱的最小横向加强比率。

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  • 来源
    《Magazine of Concrete Research》 |2019年第14期|734-748|共15页
  • 作者

    Ning Chao-Lie; Feng De-Cheng;

  • 作者单位

    Tongji Univ Shanghai Inst Disaster Prevent & Relief Shanghai Peoples R China;

    Southeast Univ Minist Educ Key Lab Concrete & Prestressed Concrete Struct Nanjing Jiangsu Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    load transfer; plain concrete; structural analysis;

    机译：负载转移;普通混凝土;结构分析;

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