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首页> 外文期刊>Journal of structural engineering >Development of a Reliability Framework for the Use of Advanced Nonlinear Finite Elements in the Design of Concrete Structures
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Development of a Reliability Framework for the Use of Advanced Nonlinear Finite Elements in the Design of Concrete Structures

机译：开发在混凝土结构设计中使用高级非线性有限元的可靠性框架

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This paper proposes a methodology that uses advanced nonlinear finite-element analysis for determining a global resistance factor for the design of reinforced concrete structures. It introduces a new reliability approach that takes into account the uncertainties of the material properties and the performance of the concrete model used in the calculations. In the proposed approach, the global resistance factor is computed following a procedure in which the coefficient of variation of the calculated resistance is estimated using Rosenblueth's point-estimate method. The robustness and simplicity of the method are demonstrated through validation examples. It is seen that good approximations of the resistance factor can be achieved for the case of normal or quasi-normal distributions of the resistance. Estimation of the coefficient of variation of the prediction error is then performed for a given reinforced concrete element and a nonlinear finite-element package. The accuracy of the selected software is considered through its ability to predict the behavior of a set of benchmarks selected for the target design structure, going from the material level to the structural level. The suggested methodology is well suited for structural engineers having access to nonlinear deterministic finite-element packages with concrete models. It proposes a reliability format that focuses on the variability on the resistance side while using the concept of critical load paths on the load side, which is compatible with the philosophy of the existing design codes.
机译：本文提出了一种方法，该方法使用高级非线性有限元分析来确定钢筋混凝土结构设计的整体阻力系数。它引入了一种新的可靠性方法，该方法考虑了材料特性的不确定性以及计算中使用的混凝土模型的性能。在提出的方法中，整体电阻系数是按照以下过程计算的，其中使用Rosenblueth的点估计方法估算所计算电阻的变化系数。通过验证示例证明了该方法的鲁棒性和简便性。可以看出，在电阻的正态分布或准正态分布的情况下，可以获得很好的电阻系数近似值。然后，对于给定的钢筋混凝土元件和非线性有限元软件包，对预测误差的变化系数进行估计。所选软件的准确性是通过其预测从目标材料级别到结构级别为目标设计结构选择的一组基准的行为的能力来考虑的。所建议的方法非常适合具有混凝土模型的非线性确定性有限元软件包的结构工程师。它提出了一种可靠性格式，该格式集中在电阻侧的可变性上，同时使用了负载侧的关键负载路径的概念，该格式与现有设计规范的原理兼容。

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