Abstract
Cold-formed steel (CFS) shear walls with concrete-filled rectangular steel tube (CFRST) columns as end studs can upgrade the performance of mid-rise CFS structures, such as the vertical bearing capacity, anti-overturning ability, shear strength, and fire resistance properties, thereby enhancing the safety of structures. A theoretical hysteretic model is established according to a previous experimental study. This model is described in a simple mathematical form and takes nonlinearity, pinching, strength, and stiffness deterioration into consideration. It was established in two steps: (1) a discrete coordinate method was proposed to determine the load-displacement skeleton curve of the wall, by which governing deformations and their corresponding loads of the hysteretic loops under different loading cases can be obtained; afterwards; (2) a piecewise function was adopted to capture the hysteretic loop relative to each governing deformation, the hysteretic model of the wall was further established, and additional criteria for the dominant parameters of the model were stated. Finally, the hysteretic model was validated by experimental results from other studies. The results show that elastic lateral stiffness Ke and shear capacity Fp are key factors determining the load-displacement skeleton curve of the wall; hysteretic characteristics of the wall with reinforced end studs can be fully reflected by piecewise function hysteretic model, moreover, the model has intuitional expressions with clear physical interpretations for each parameter, paving the way for predicting the nonlinear dynamic responses of mid-rise CFS structures.
Highlights
As the main load-bearing components of cold-formed steel (CFS) structures, the definition of a CFS shear wall’s hysteretic model is essential for nonlinear dynamic analysis of the structures
Numerous numerical studies have been conducted on the seismic performance of traditional CFS shear walls with coupled C section end studs [9,10,11,12,13,14]
Based on the hysteretic characteristics of the load-displacement curves discussed in the study by Wang and Ye [21], a hysteretic model of the wall with reinforced end studs will be established in two steps: (1) the load-displacement skeleton curve, which can describe both strength deterioration and stiffness deterioration of the wall, will first be determined as the backbone curve of the hysteretic model; (2) hysteretic loops which can reflect both slipping and pinching characteristics of the wall will
Summary
As the main load-bearing components of cold-formed steel (CFS) structures, the definition of a CFS shear wall’s hysteretic model is essential for nonlinear dynamic analysis of the structures. Full-scale cyclic loading tests are the main way to investigate the shear performance of CFS shear wall, and the definition of the walls’ hysteretic characteristics depends largely on test results [1,2,3,4,5,6,7,8], because those walls have complex configurations and their load-displacement curves exhibit high nonlinearity and pinching together with strength and stiffness deterioration. It is necessary to establish a hysteretic model with a good reflection of hysteretic characteristics of walls according to the configuration of CFS shear walls with reinforced end studs in order to facilitate the nonlinear dynamic analysis of mid-rise.
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