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Title |
Shear Strength Reduction Ratio of Reinforced Concrete Shear Walls with Openings
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Keywords |
전단벽 ; 개구부-면적 비 ; 전단강도 저감률 shear wall ; opening-wall area ratio ; shear strength reduction factor |
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Abstract |
There are many types of remodeling, however, engineers and architectures preferred to merge two or more separate units to one very spacious unit. Performing this type of remodeling, in the case of wall dominant apartments, requires partial removal of structural wall causing a concern of structural integrity. However, there are insufficient studies about partial removal, that is, openings. Presently, ACI standard have no clear way to evaluate the effect of opening on the structural wall. AIJ has the provision about strength reduction factor ‘γ’. However, this reduction factor cannot exactly evaluate the reduction effect of openings because this factor ‘γ’ was determined through the elastic analysis. Therefore, in this study, 2 structural wall specimens were tested and many test results from previous studies were collected. Using these data, this study performed statistical analysis about strength of structural wall which have the opening in wall panel. And this study performed parametric study verifying shear strength reducing effect by opening area. In the results of statistical study, previous reduction factor show very conservative results because this equation did not consider other factors, reinforcement ratio and aspect ratio of openings, which was affect the shear strength of shear walls. Therefore we performed parametric study based on the test data and suggest new equation for shear strength reduction factor ‘γ’.
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