Numerical evaluations of a novel membrane element in response history analysis of reinforced concrete shear walls

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.

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