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The document discusses the design of combined steel columns using lacing and batten plates, suitable for large straining actions or when rolled I-sections are unavailable. It outlines various systems of laced and battened columns, providing design procedures and examples to ensure structural integrity under axial forces and bending moments.
The document focuses on the design of combined steel columns that utilize lacing and batten plates, which are particularly useful in scenarios involving large straining actions or when rolled I-sections are not readily available. It begins by explaining the characteristics and advantages of combined sections, typically formed from two channels, two IPE sections, or four angles connected by lacing bars or batten plates.
The text elaborates on the systems of laced and battened columns, detailing the differences between single and double interaction systems. It provides specific guidelines for the inclination of lacing bars, with recommended angles ranging from 50 to 70 degrees for single interaction systems and 40 to 50 degrees for double interaction systems. The document also specifies the maximum length between lacing bars and the thickness limitations for plates, ensuring that the design adheres to structural integrity standards.
Additionally, the document includes the design considerations for lacing bars, which are treated as diagonal members of a truss. It outlines the forces that lacing bars must resist, incorporating both shearing and axial forces. The interaction equations necessary for ensuring safety and economic viability in design are also discussed.
Overall, the document serves as a comprehensive guide for engineers and designers, providing essential information on the design principles, calculations, and considerations necessary for effectively utilizing laced and battened systems in steel column construction.
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