EVALUATION OF SEISMIC PERFORMANCE OF CABLE-LAYING CONDUIT LINING FOR THE PROTECTION OF OPTICAL FIBER CABLE

Abstract

 The purpose of this paper is to develop a new earthquake-resistant design and a new countermeasure for telecommunication conduits against large earthquakes. The paper discusses the countermeasure, which doubles pipes by lining, through both experimental and analytical methods, considering failure mechanism of optical cables. Specifically, three next actions were assumed: when the joints of pipes collide during compression-tension cyclic loadings; when permanent ground displacement due to liquefaction, subsidence or collapse of ground occur; when the protection concrete fractures and the shearing stress act on the cables. It was found that even though the failures at the joints of pipes occur, the cable-laying conduit lining can still contain the essential function to keep space for cables and to prevent the disruption of cables.