In the first part of this paper the general principles and procedures for assessment of existing structures based on the International Standard ISO 13822 are given. In the second part an overview of the state-of-the-art in techniques for seismic rehabilitation of existing buildings is presented. First, typical techniques used for reinforced concrete, steel and masonry building are summarized in accordance with the aims of rehabilitation. New approaches to utilize seismic isolation and supplemental damping, as well as conventional strengthening techniques, to infill, brace and jacket existing structure are described.
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