Fiber-Based Nonlocal Formulation for Simulating Softening in Reinforced Concrete Beam-Columns
Fiber-Based Nonlocal Formulation for Simulating Softening in Reinforced Concrete Beam-Columns
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DOI：
10.1061/(asce)st.1943-541x.0002218
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发表时间：
2018-12-01
影响因子：
4.1
通讯作者：
Kanvinde, Amit
中科院分区：
文献类型：
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作者：
Kenawy, Maha;Kunnath, Sashi;Kanvinde, Amit
提出了一个非局部的公式框架，以解决在本构软化的存在下，基于位移的框架单元模型中的网格相关应变局部化问题。该框架由一个基于非局部位移的框架单元和一个基于非局部纤维的塑性模型组成，用于模拟钢筋混凝土结构构件的峰后响应。算法实现的框架进行了讨论，其性能进行了深入的研究。网格敏感性研究表明，所提出的方法消除了网格相关的应变局部化，并导致客观的全球（即，载荷位移）和局部（即，曲率轮廓）响应。与24根试件的实测数据比较表明，本文方法预测的钢筋混凝土梁柱峰后响应具有合理的精度。所提出的框架的局限性进行了讨论沿着与进一步发展的领域。(C)2018年美国土木工程师协会。
A nonlocal formulation framework is presented to address mesh-dependent strain localization in displacement-based frame element models in the presence of constitutive softening. The framework consists of a nonlocal displacement-based frame element and a nonlocal fiber-based plasticity model, and is used to simulate the postpeak response of RC structural members. The algorithmic implementation of the framework is discussed, and its performance is thoroughly investigated. Mesh sensitivity studies reveal that the proposed approach eliminates mesh-dependent strain localization and leads to objective global (i.e., load displacement) and local (i.e., curvature profile) response in the presence of concrete softening. Comparison with historical test data from 24 column specimens shows that the postpeak response of RC beam-columns is predicted with reasonable accuracy. The limitations of the presented framework are discussed along with areas for further development. (C) 2018 American Society of Civil Engineers.