Concrete filled tubes (CFT) are commonly used for high-rise buildings and encased in reinforced concrete (RC) at the basement floor. However, evaluating the shear strength of the beam-to-column joints is currently unclear because of a lack of experimental investigations. First of all, the previous evaluation methods in AIJ standard and recommendations were summarized and the evaluation method composed of each component is rearranged. Then, a cyclic loading test of beam-to-column joints was conducted to verify the application of the evaluation method. The experiment results indicate that the evaluation method enables to predict plastic strengths of each component.
In this study, static loading tests were performed to investigate the structural performance of RC frames with CLT walls. The experimental investigation revealed that the presence of CLT infill significantly increased the initial stiffness and strength of RC frame regardless the RC frame-CLT infill connections. The post-peak strength of the RC frame with CLT infill did not drop below 80% of the maximum strength even in a large drift of 10%. These results clarified that the presence of CLT infill within RC frame has a beneficial effect on the seismic performance of RC frame structure.
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