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| Research on Target Reliability Index of Ultimate Limit States for Steel Railway Bridge |
| PAN Yong － jie，ZHANG Yu － ling，LIU Xiao － guang |
| China Academy of Railway Sciences，Beijing 100081，China |
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Abstract Research purposes:Limit states design method based on reliability theory is the trend of development for the design code in railway engineering structures，and the target reliability index is an important part among it．With the rapidly development of railway industry，the basic conditions of the original calibrate value have partly changed，which requires analysis of target reliability index for steel railway bridges’ultimate limit states under the new situation．
Research conclusions:Under the new situation，resistance statistical parameters of steel railway bridge have been listed．The target reliability indexes of ultimate limit states are calibrated．At the meantime，the partial factors of dead load and live load and resistance are advised，which can meet needs of safety requirements of inheritance in transition from the allowable stress method to limit states design through verification． According to the sensitivity analysis of load and resistance parameters，the statistical parameters of resistance and live load have a large effect on the reliability index，while the parameters of dead load and the ratio of dead load and live load have little effect on it．
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Received: 12 May 2011
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2011, Vol. 28 
