Abstract
The stress–strain relationship of confined concrete is important in both theoretical analysis and engineering. In order to expand the application of composite columns in building design and practice engineering, the design-oriented constitutive model of confined concrete is studied and established in this chapter. The lateral confining mechanism of confined concrete is analyzed to study the unified characteristics at first. Then the unified equations for peak stress and peak strain are proposed by using the Twin Shear Unified Strength Theory and verified by experimental results. After that, the existing constitutive of unconfined concrete is studied as the foundation to establish the constitutive model for actively confined concrete, and the existing simple constitutive model for passively confined concrete is established. The two proposed constitutive models consider unconfined concrete strength, confining type, and confining effect. They can provide accurate prediction results for confined concrete.
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