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Numerical evaluations of a novel membrane element in response history analysis of reinforced concrete shear walls
Engineering Structures ( IF 5.5 ) Pub Date : 2020-10-01 , DOI: 10.1016/j.engstruct.2020.110760
T.L. Chang , C.-L. Lee , A.J. Carr , R.P. Dhakal

Abstract A novel membrane element named as GCMQ (Generalised Conforming Mixed Quadrilateral) has recently been proposed for modelling reinforced concrete shear walls, as well as other types of planar problems. In this work, a simplified version, abbreviated to SGCMQ (Simplified GCMQ), is constructed by omitting the enhanced strain field for the purpose of an improved balance between cost and performance. The new SGCMQ element is investigated in details with emphasis on its performance in respect of response history analysis. Both simple elastic material and complex elasto-plastic materials, including reinforced concrete, are adopted in order to benchmark the performance in different cases. The high coarse mesh accuracy is retained in SGCMQ. The numerical simulations show that SGCMQ and GCMQ are able to predict accurate natural periods with very few elements defined. This feature is beneficial for both linear and nonlinear analyses to reduce computational cost as well as to improve accuracy by filtering out high frequency noise. With objective material models that can account for the size effect, it is possible to perform response history analyses of reinforced concrete structures with a relatively low computational cost and obtain results of high accuracy and reliability providing that the material response is accurate.

中文翻译:

新型膜单元在钢筋混凝土剪力墙响应历史分析中的数值评价

摘要 最近提出了一种名为 GCMQ(广义一致混合四边形)的新型膜单元,用于模拟钢筋混凝土剪力墙以及其他类型的平面问题。在这项工作中,为了提高成本和性能之间的平衡,通过省略增强应变场构建了一个简化版本,缩写为 SGCMQ(Simplified GCMQ)。详细研究了新的 SGCMQ 元素,重点是其在响应历史分析方面的性能。采用简单的弹性材料和复杂的弹塑性材料,包括钢筋混凝土,以衡量不同情况下的性能。SGCMQ 保留了高粗网格精度。数值模拟表明,SGCMQ 和 GCMQ 能够在定义的元素很少的情况下预测准确的自然周期。此功能有利于线性和非线性分析,以降低计算成本并通过滤除高频噪声来提高精度。使用能够考虑尺寸效应的客观材料模型,可以以相对较低的计算成本进行钢筋混凝土结构的响应历史分析,并在材料响应准确的情况下获得高精度和可靠性的结果。
更新日期:2020-10-01
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