铁路桥梁浅基础设计变量的不确定性分析

UNCERTAINTY ANALYSIS OF THE DESIGN VARIABLES OF THE RAILWAY BRIDGE'S SHALLOW FOUNDATIONS

设计变量不确定性的计算分析是可靠性理论修订规范的基础工作。本文对铁路桥梁浅基础可靠度设计中各种变量的不确定性进行了分析计算．推导了其作用荷载和地基土抗力的变异系数的计算表达式．可供可靠度理论规范改革时参考和利用。

Estimating the uncertaintics of the design variables is the basis of revising the design code based on the reliability theory. This paper analyses the uncertainties of the design variables of the shallow foundations of the railway bridges, and derives the expressions computing the coefficient of variations of the load and the resistance of the soils. The results in the paper can be adopted while re vising the current code.