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| The Effect of Correlation between Variables on Reliability Index |
| WANG Zhan - sheng，LUO Yi - nong，WEI Yong - xing，LI An - hong，GUO Hai - qing，YANG Fang |
| (China Railway Eryuan Engineering Group Co. Ltd，Chengdu，Sichuan 610031，China) |
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Abstract Abstract : Research purposes : Reliability index is one of the important indexes to measure reliability，and is also one of the important target values in the transition period of Chinas reliability design standard (code). At present，the limit state design codes of bridge，roadbed， tunnel and rail of railway engineering have been released in China，while the others being in development. No matter for the perfection or the supplementation of these codes in the days to come，it is very necessary and important to establish an accurate calculation method of reliable index. Research conclusions : Firstly，from a practical point of view， this paper points out the defects of current reliability index calculation formula; secondly，from probability theory， a new reliability index calculation formula is establislied considering correlation between variables; findy，through an example，the effect of correlation on the reliability index is analyzed. This result shows as follows : (1) The correlation between the load and the resistance is positively correlated with reliability index. (2) The correlation between the load parts or the resistance parts is negatively correlated with reliability index. (3) The research of this paper has an important theoretical support for the improvement of reliability design code and the establishment of a reasonable partial coefficient.
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Received: 05 September 2016
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2016, Vol. 33 
