ABSTRACT
The need to strengthen RC structures that were constructed some years ago, may become particularly pressing. In order to increase the ductility and strength of RC columns, jacketing with steel plate or RC layer has been carried out. Nowadays, jacketing can be done by wrapping the column with new composite materials such as carbon and glass fiber laminates. For performance assessment of such strengthening, it is necessary to have tools to systematically evaluate the post-strengthened mechanics of the complete structure. Since strengthening materials placed around existing RC columns provide confinement to the column, the problem is inherently three-dimensional. Here, the three-dimensional analysis tool discussed in Chapter 3 will be employed, with a particular focus on RC columns. Numerical models to determine the cross-sectional strengths [1, 2] and structural response [3-5] of concrete-filled steel tubes have been proposed. In this chapter, full threedimensional constitutive models for concrete and strengthening materials are used for the rational evaluation of the effect of steel plate jacketing and carbon fiber sheet (CFS) wrapping on RC columns under axial, flexural and shear loadings.
