Abstract
In Japan, in order to prevent supports in overhead contact systems from collapsing at the time of an earthquake, we design them according to the Seismic Design Guideline for Overhead Contact Systems and Commentary (hereafter referred to as the OCS Guideline). Many supports are damaged in case they resonate with the civil engineering structures at the time of an earthquake. Furthermore, in order to design reasonably supports with safety, it is necessary that the seismic performance of them accords with that of the civil engineering structures. The Design Standard for Railway Structures of Seismic Design and Commentary (hereafter referred to as the Seismic Standard) describes the seismic design method for railway structures including the civil engineering structures. The Seismic Standard was revised in 2012. In order to maintain consistency with the Seismic Standard, we revised the OCS Guideline in 2013. In the revision, we modified ground motions that should be considered. Moreover, we added the ratio of the rotational response to the horizontal response which includes the effect of the rotational response of the civil engineering structure on supports to the design parameters. Furthermore, a method of compensating the natural period of supports is described. Therefore, we can evaluate the seismic performance of supports more precisely.
