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首页> 外文期刊>Bulletin of earthquake engineering >The fixed-strut-angle finite element (FSAFE) model for reinforced concrete structural walls
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The fixed-strut-angle finite element (FSAFE) model for reinforced concrete structural walls

机译：钢筋混凝土结构墙固定支柱有限元（FSAFE）模型

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This paper evaluates the capabilities and limitations of a relatively simple mesoscopic finite element modeling approach, referred to as the Fixed Strut Angle Finite Element (FSAFE) Model, in simulating the hysteretic lateral load behavior of reinforced concrete structural walls designed to yield in flexure. The behavioral characteristics of the constitutive panel (membrane) elements incorporated in the model are based on a simple fixed-crack-angle formulation, where normal stresses in concrete are calculated along fixed crack directions using a uniaxial stress-strain relationship, with modifications to represent biaxial softening effects. The constitutive panel model formulation also incorporates behavioral models for the shear-aggregate-interlock effects in concrete and dowel action on reinforcing bars, constituting the shear stress transfer mechanisms across cracks. Model predictions are compared with experimentally-measured responses of benchmark wall specimens with a variety of configurations and response characteristics. Accurate predictions are obtained for important global response attributes of the walls prior to failure, including their lateral load capacity, stiffness, ductility, and hysteretic response characteristics; although instability failures related to buckling of reinforcement and/or out-of-plane instability of the wall boundary region are not captured. The model provides accurate estimates of the relative contribution of nonlinear flexural and shear deformations to wall lateral displacements, as well as local response characteristics including the distribution of curvatures, strains, and shear deformations on the walls, prior to failure. Based on the response comparisons presented, model capabilities are assessed and possible model improvements are identified. Overall, the FSAFE model is shown to be a practical yet reliable modeling approach for simulating nonlinear wall behavior, which can be used within the framework of performance-based seism
机译：本文评估了相对简单的介观型有限元建模方法的能力和限制，称为固定支柱有限元（FSAFE）模型，模拟钢筋混凝土结构壁的滞回横向承载行为，该钢筋混凝土结构壁的磁阻横向载荷行为。结合在模型中的构成面板（膜）元件的行为特征基于简单的固定裂缝角制剂，其中混凝土中的正常应力沿着固定裂缝方向使用单轴应力 - 应变关系来计算，修改为代表双轴软化效果。构成面板模型制剂还包括用于加强杆上的混凝土和销钉作用中的剪切聚集互锁效应的行为模型，构成横跨裂缝的剪切应力传递机制。将模型预测与基准壁样本的实验测量响应进行了比较，具有各种配置和响应特性。在发生故障之前，为墙壁的重要全球响应属性获得准确的预测，包括它们的横向负载能力，刚度，延展性和滞后响应特性;尽管没有捕获与围墙和/或墙边界区域的平面外不稳定性相关的不稳定性故障。该模型提供了对壁横向位移的非线性弯曲和剪切变形的相对贡献的准确估计，以及局部响应特性，包括在故障之前，包括墙壁上的曲率，菌株和剪切变形的分布。基于所提出的响应比较，评估模型能力，并确定可能的模型改进。总的来说，FSAFE模型被证明是用于模拟非线性墙壁行为的实用而可靠的建模方法，可以在基于性能的地震框架内使用

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