Assessment of the Role of Element Arrangement in Uniform Stress Distribution within the StrongBack Braced System with Steel Brace

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Authors

1 Department of Civil Engineering, Golestan University

2 faculty member

10.22034/ceej.2025.66873.2431

Abstract

strongback brace frame is one of the new systems introduced to prevent the soft story mechanism. Despite the appropriate behavior of this system in studies, these studies are limited and the various aspects affecting the design of this system require further investigation.In this study, various configurations of the elastic truss and inelastic bracing members were investigated to evaluate their effects on the structural behavior and force distribution in the elastic truss members under cyclic static loading. The results indicate that the use of yielding ties can reduce the forces in other members of the elastic truss by up to 30%. However, after buckling occurs, these ties lead to a concentration of deformation—up to 30%—in a single story, which consequently increases the forces in other members. Implementing a yielding tie in the first story not only increases the overall structural strength, but also reduces the force in other ties by up to 30%. Nevertheless, it leads to an increase of up to 20% in the uplift force of the column. The evaluation of different configurations also revealed that using V- and inverted V-shaped (chevron) layouts significantly increases the forces in elastic truss members—by up to 100%. However, by applying yielding ties, it is possible to reduce these forces by approximately 50%. Furthermore, reducing the length of the inelastic region, although initially decreasing the induced forces, leads to premature failure of the braces during higher displacement cycles, resulting in a significant drop in structural strength at large deformations.

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Journal of Civil and Environmental Engineering

Articles in Press, Accepted Manuscript
Available Online from 20 October 2025

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