Abstract
Numbers of railway viaducts were severely damaged and collapsed in the Hyogoken-Nanbu Earthquake in January 1995. Intensive restoration works were conducted to make early re-operation of the damaged railway lines. An urgent strengthening operation was put in motion to provide sufficient shear strength and ductility for existing RC viaduct columns. Most of the restoration works and strengthening operation were conducted using the steel jacketing method. New seismic strengthening methods using synthetic materials, such as carbon, aramid and glass fibers, have been proposed and also applied. After a lapse of four years, a draft of new seismic design specification for railway structures was proposed. In this article, the outlines of restoration of damaged structures in the Hyogoken-Nanbu Earthquake, design methods and their research backgrounds of new strengthening method, and the concept of new seismic design standards will be presented.
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