The mechanical behavior of multidirectional finned circular hollow steel damper: Analytical and numerical approach

This study investigates the mechanical behavior of a multidirectional finned circular hollow steel damper (MFCHSD) under cyclic loading by using numerical and analytical approaches. We propose to vary the surrounding an even number of scraped curved fins, i.e., four, six, and eight pieces, to improve the performance of the slender circular hollow steel damper (CHSD). The analytical approach implemented the classic analysis of shear stress distribution of thin walls, whereas the numerical approach adopted the finite element method with continuum shell element. Important characteristics, such as shear yield stress distribution, shear coefficient, shear yield strength, elastic stiffness, post-yield stiffness, and maximum strength, were examined. These parameters are used to predict the maximum-to-yield strength ratio and the post-yield-to-elastic stiffness ratio, which the important for the design of MFCSHD. Results suggest that the presence of additional fins increases CHSD performance in the form of shear yield strength, maximum strength, and post-yield stability. In addition, the shear yield stress distribution of the CHSD web was achieved, exhibiting good agreement between the analytical and the numerical approaches. Finally, the shear yield strength of MFCSHD could be quantified using a novel formulation in accordance with the shear stress distribution analysis.