Eccentric behavior of l-shaped Multi-partition Steel-Concrete composite shear walls. (15th March 2023)

• Record Type: Journal Article
• Authors: Wang, Yunhe; Guo, Lanhui; Chen, Jie; Zhao, Hui
• Is Part Of: Engineering structures. Volume 279(2023)
• Publication Date: 2023-03-15
• Subjects: l-shaped components -- Multi-partition steel tube -- Eccentric experiments -- Finite element analysis -- Simplified design methods; Structural engineering -- Periodicals; Structural analysis (Engineering) -- Periodicals; Construction, Technique de la -- Périodiques; Génie parasismique -- Périodiques; Pression du vent -- Périodiques; Earthquake engineering; Structural engineering; Wind-pressure; Periodicals; 624.105
• DOI: 10.1016/j.engstruct.2022.115563
• Languages: English
• ISSNs: 0141-0296

Abstract

Highlights: A new type of l -shaped steel–concrete composite shear wall using multi-partition steel tube was proposed. The behavior under the eccentric load was investigated by the means of experiments and finite element analysis. The proposed model using improved constitutional relationship of concrete simulated the eccentric behavior reasonably. Simplified formulas were proposed to predict the N - M curves, which could consider the influence of load angle and slenderness. Abstract: An l -shaped composite shear wall, comprised of a multi-partition steel tube and concrete, is developed to improve the behavior of the l -shaped component. It possesses high load-resisting strength and good ductility as it makes better use of steel and concrete. Eleven samples were tested under eccentric load to determine the impacts of the depth, breadth, and load angle. The experimental results showed that the eccentric strength of the specimen under a load angle π was higher than that of the specimen under a load angle of 0. The specimens failed in out-of-plane and in-plane flexural modes when the depth-to-width ratios were different. Then, the finite element (FE) model using an improved constitutional relation of concrete was established to analyze the eccentric mechanism of the l -shaped composite shear walls. Furthermore, parametric analysis using the FE model was taken to determine the key factors of eccentric behavior. Compared to the design methods specified in EC4, AISC, and CECS, it was found that the calculated capacity for the stub was underestimated while the calculated capacity of the slender components was overestimated. The simplified formulas were presented for predicting the N - M curves based on the experimental and FE analysis and it could conservatively include the influence of the load angle and the relative slenderness.