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An efficient three-dimensional solid finite element dynamic analysis of reinforced concrete structures

机译：钢筋混凝土结构的高效三维固体有限元动力分析

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摘要

Most of the finite element analyses of reinforced concrete structures are restricted to two-dimensional elements. Three-dimensional solid elements have rarely been used although nearly all reinforced concrete structures are under a triaxial stress state. In this work, a three-dimensional solid element based on a smeared fixed crack model that has been used in the past mainly for monotonic static loading analysis is extended to cater for dynamic analysis. The only material parameter that needs to be input for this model is the uniaxial compressive strength of concrete. Steel bars are modelled as uniaxial elements and an embedded formulation allows them to have any orientation inside the concrete elements. The proposed strategy for loading or unloading renders a numerical procedure which is stable and efficient. The whole process is applied to two RC frames and compared against existing experiments in the literature. Results show that the proposed approach may adequately be used to predict the dynamic response of a structure.
机译：钢筋混凝土结构的大多数有限元分析都限于二维元素。尽管几乎所有钢筋混凝土结构都处于三轴应力状态，但很少使用三维立体单元。在这项工作中，基于污点固定裂纹模型的三维实体元素已被扩展到用于动态分析，该实体过去主要用于单调静态载荷分析。该模型唯一需要输入的材料参数是混凝土的单轴抗压强度。钢筋被建模为单轴元素，并且嵌入式公式允许它们在混凝土元素内部具有任何方向。所提出的装载或卸载策略提供了稳定且有效的数值程序。整个过程应用于两个RC框架，并与文献中的现有实验进行比较。结果表明，所提出的方法可以适当地用于预测结构的动力响应。

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