Document Type : Original Article

Authors

• Safa Peyman ¹
• Reza Mohammadi Zakibakhsh ²

¹ Assistant Professor, Department of Civil Engineering, Imam Hossein University, Tehran, Iran

² Master's student, Civil Engineering Dept., Faculty of Engineering, Emam Hossein University, Tehran, Iran.

Abstract

Structural frame systems with lateral bracing are widely used due to their ease of construction and cost-effectiveness. On the other hand, the out-of-axis alignment of braces is a common structural execution problem. Given the impact of this deviation on the structural behavior and buckling of braces, examining this issue is of great importance. According to the design codes for steel structures, the alignment of converging braces should pass through the intersection of the beam and column axes. In some structures, due to neglecting this issue and problems such as neighboring wall constraints, eccentricities both inside and outside the plane of the frame with a bracing system occur. In this research, the effects of in-plane and out-of-plane eccentricities of brace alignment on the critical buckling load of cross-braced building frames are investigated using the finite element method. In this regard, all frame members are modeled using shell elements in SAP2000 software, and buckling analysis is performed. The results indicate that in the case of in-plane eccentricities, when the brace alignment passes through the column, the critical buckling load of the brace decreases. Furthermore, as the thickness of the connection plate decreases, this reduction becomes more significant. For braces with out-of-plane eccentricities, the critical buckling load also decreases, and the greater the eccentricity, the more the axial load-carrying capacity of the brace is reduced.

Keywords

• Cross brace
• in-plane eccentricity
• out-of-plane eccentricity
• brace connections
• brace buckling

Main Subjects

• structure