Analysis on time-varying reliability of bridge crane structure based on PHI2

doi:10.16265/j.cnki.issn 1003-3033.2021.07.018

Abstract

Abstract: In order to explore impact of cumulative effect of time on cranes' failure probability, a time-varying reliability analysis method for crane metal structures based on improved PHI2 was proposed. With bridge crane as an example, its metal structure's stress was firstly analyzed, and dangerous point which featured the smallest difference with allowable stress of material and allowable rigidity of structure was selected for structural numerical analysis. Secondly, RSM was utilized to construct a function approximately. Finally, outcrossing rate was calculated by using improved PHI2 method so as to obtain cumulative failure probability of metal structure. The results show that reliability index considering cumulative effect of time is significantly lower than that without considering it.

Key words: bridge crane, time-varying reliability, response surface method (RSM), metal structure, PHI2 method

CLC Number:

X952

LIU Yuzhen, YANG Ruigang, ZHAO Guangli, JING Weichen, MA Xiaoxing. Analysis on time-varying reliability of bridge crane structure based on PHI2[J]. China Safety Science Journal, 2021, 31(7): 130-136.

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