A Macro Model for Reinforced Concrete Structural Walls Having Various Opening Ratios

Abstract eng:
In the current design cord of AIJ(Architectural Institute of Japan), the minimum strength reduction factor of a structural wall due to the openings is limited to 0.6 by restricting the maximum ratio of opening sizes to the corresponding wall length and height. In this study, a modified macro-model is proposed to establish a simple method to design a reinforced concrete structural wall having large openings with a significant eccentricity. The model is composed of column elements and strut-and-tie elements which represents the wall parts. The proposed model was established by modifying the model proposed by Tekehara et al. to obtain more accurate load-deformation relationships in the case of multi-story walls with eccentric openings. The main modified item is the additional modeling of the concrete struts and tension ties located around the openings. The proposed model was applied to three of the three-storied reinforced concrete structural walls with eccentric openings, where the adjacent walls between the stories were connected by rigid beam elements and the springs expressed by bi-linear models. The results obtained from the proposed model were compared with those from experiments and the model by Takehara et al. and the adequacy of the proposed model was confirmed.

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