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研究组合拱式管桥可靠性分析中的载荷处理问题。基于这种管桥所受可变载荷的随机性，采用平稳二项随机过程作为可变载荷的概率模型，并利用该模型的基本特性，通过一定的教学变换得出了设计基准期内可变载荷最大值的概率分布函数ＦＭ（ｘ）与任意时点概率分布函数Ｆ（ｘ）之间的实用关系式。然后，针对一组在５０年设计基准期内组合拱式管桥输送介质内压、环境最高气温和环境最低气温的模拟数据以及建筑部门对风载荷的统计结果，推导了这些可变载荷统计参数（均值和标准差）的计算表达式。其结果可作为组合拱式管桥可靠性分析与设计的参考。

STATISTICAL ANALYSIS FOR VARIABLE LOADS OF COMBINED ARCHED PIPELINE BRIDGE

This paper studies the load process problems in reliability analysis of the combined arched pipeline bridge. As the variable loads acting on this kind of bridge have the characteristic of randomness,so stationary binomial stochastic process is used as the probability model of the variable loads.Based on the properties of the model,a practical formula which express the relationship between the probability distribution function of the maximum value of variable loads in the design reference period F.(x)and the probability distribution function F(x)at arbitrary time-point is obtained through mathematical transformation.Then,according to a group of simulated data about the internal pressure of transfer medium,the highest and the lowest environmental temperature acting on the combined arched pipeline bridge in 50 years of design reference period, and the statistical results of wind load obtained by the architectural research institute, the calculation formula for the statistical parameters(mean value and standard deviation)about these variable loads is developed.The results can be used as the reference in reliability analysis and designing of the combined arched pipeline bridge.