Author(s): Zeng Yu-Hong; Hu Min-Liang
Linked Author(s):
Keywords: Reliability; Bridge; Flood risk; Railway system
Abstract: The reliability of railway bridge is calculated in this paper at first. Railway bridge is considerable important structure on railway, and can't be repaired soon once broken. Three items are included in calculating: The first is to examine the reliability of bridges' structures with the extreme state equation, and accurate results can be got when the achievements in civil engineering are consulted. The second is to calculate the reliability of the bridges' discharging ability, which has been discussed in Ref [6], so no more will be talked about in this paper. The last is to calculate the reliability of a bridge to resist pier scour. The extreme state equation has considered the depths of both normal scour and partial scour here. To be simple, the statistic distribution patterns of variables related to geometrical size are regarded as normal, coefficients as triangular, as P-Ⅲ, and products of several random variables as log normal, etc. On the basis of analyzing the reliability of railway bridges, calculation methods about systems are discussed. A section, a rail bureau, or the whole Jingguang railway line can be all regarded as a system. Series and parallel systems are the two kinds of basic patterns, which can form complex systems. After the reliability of the element (bridge) was known, methods to calculate reliability of systems have been suggested in this paper. Finally, risk damage, which has connected with risks and damages, has been put forward, and it can be written as initially. Then human power and resources can be concentrated to benefit those regions with a maximum.
Year: 2001