Effect of Opening Size on Compressive Strut of RC Shear Walls With Openings Based on Fem Analysis

Abstract eng:
In this paper, applicability of the model for wider range of the opening ratio is examined. A 2D non-linear finite element (FE) analysis for shear walls with or without openings is conducted to investigate the effect of opening sizes on their internal compressive struts. All the analytical models in this study assume almost the same opening shape, and the parameters are the layout of openings and their widths corresponding to the opening ratio from 0.05 to 0.5. The analytical results show that compressive diagonal struts are formed between openings and transfer shear in walls in similar way to the previous studies depending on the opening ratio. In the range of the opening ratio up to 0.4, calculated strength agrees well with those obtained from the conventional method based on the practically used opening ratio. But, as for the larger opening ratio than 0.4, remarkable concentrated stress in strut ends is observed at the connections to the columns, and this stress concentration makes it difficult to accurately predict the failure mechanism. It is concluded that further investigations are necessary to precisely estimate the strength of shear walls with the larger opening ratios, taking account of struts formations and their ultimate state criteria.

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