Abstract

During past severe earthquakes, a number of R/C buildings designed by the old codes suffered heavy damages including collapse. To evaluate the seismic performance of old buildings for the ultimate limit state, it is important to study the nature of axial shortening for old columns subjected to earthquake loads. Half-scale model specimens with shear mode simulating old columns were tested until they came to be unable to sustain axial load. Using results of the tests, it was attempted to formulate the relations of vertical and lateral deformation based on the concept of failure surface contraction and theory of plastic flow.

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