Basic investigation on the seismic redundancy of a damaged steel truss bridge

Abstract

The purpose of this paper is to grasp the seismic redundancy of a damaged steel truss bridge. We do the monotonically increasing live load analysis and the seismic response analysis for the damaged steel truss bridges to examine the effect of a difference of the damaged position and the damaged type of members on the safety of the bridge. From the results of the analyses, it is found that the safety of the model that the diagonal members of the vicinity of the support break becomes very small in the static analysis and the dynamic analysis. Furthermore, in the case that the small damage is spread widely, the seismic redundancy becomes small compared to the model that the two diagonal members broke.