Damage Prediction for Concrete-Encased Steel Piers Subjected to Lateral Cyclic Loading

Abstract eng:
This paper presents an experimental and analytical investigation of the seismic performance of concrete-encased steel piers, which are sometimes known as steel-reinforced concrete (SRC) structures. In particular, a ductility evaluation and a damage prediction method for the seismic design of SRC piers are proposed. First, load-deformation characteristics and plastic curvature distribution were measured in cyclic loading tests of SRC columns. In these tests, two limit states considering the damage level of SRC columns were shown. In this study, the restorable limit state and the ultimate limit state are defined as the spalling of the cover concrete and the local buckling of the H-shaped steel, respectively. To evaluate the displacement at the restorable limit state, the plastic curvature distribution at the spalling of the concrete cover was modeled to the rectangle distribution, and its curvature was calculated by buckling analysis of the longitudinal bars confined within the cover concrete and the ties. The displacement at the ultimate limit state was calculated by integrating the curvature distribution based on the local buckling analysis of a steel plate fixed in concrete. Using experimental tests including those of other authors, it was confirmed that the proposed method can appropriately evaluate the displacement at the restorable limit state (the spalling of the cover concrete) and the ultimate limit state (the local buckling of the H-shaped steel) of SRC columns.

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