Strength of Partially Encased Steel-Concrete Composite Column for Modular Building Structures

Area of Science:

• Structural Engineering
• Materials Science

Background:

• Modular construction is expanding to high-rise buildings, requiring robust and economical structural systems.
• Steel-concrete composite structures offer a viable solution, but nonsymmetrical columns present design challenges.

Purpose of the Study:

• To evaluate the strength and develop design methods for partially encased nonsymmetrical steel-concrete composite columns.
• To address the complexities arising from the inherent nonsymmetrical properties of these columns.

Main Methods:

• Experimental testing of four full-scale composite column specimens.
• Analysis of factors including column slenderness, eccentricity, and the role of through bars.
• Development of P-M interaction curves using the plastic stress distribution method.

Main Results:

• Through bars are crucial for delaying local buckling and ensuring uniform load distribution.
• The experimental data informed the development of new design methodologies.
• The proposed design methods offer conservative strength predictions for the composite columns.

Conclusions:

• Partially encased nonsymmetrical steel-concrete composite columns are suitable for high-rise modular structures.
• The developed design methods provide a reliable framework for engineers.
• Further research can optimize these composite systems for enhanced performance and cost-efficiency.