基于正交试验法的刚构拱组合桥稳定性参数分析

Stability Parameter Analysis of Rigid Frame Arch Composite Bridge Based on Orthogonal Test Method

针对刚构拱组合桥的结构设计参数进行优化和稳定性分析,选择拱肋横撑形式、吊杆损伤程度、拱肋钢管壁厚度以及拱轴系数等设计参数,通过定义目标函数K分析连续刚构拱组合桥的稳定性。基于正交试验方法的参数分析,确定连续刚构拱组合桥稳定性最优参数组合。其次采用极差分析法和方差分析法对目标函数K进行分析,获得结构设计参数的敏感性及显著性。结果表明,拱肋横撑布置形式是连续刚构拱组合桥空间稳定性影响程度最大、最敏感的参数,参数敏感性程度由强到弱依次为拱肋横撑形式、吊杆损伤程度、拱肋钢管壁厚度、拱轴系数;结构最优参数组合为:K字形横撑,吊杆损伤面积5%,拱肋钢管壁厚度55 mm,拱轴系数2.2,较原设计方案稳定性系数提高了63.12%。

Based on the optimization and stability analysis of the structural design parameters of the rigid-frame arch composite bridge,design parameters such as the form of arch rib transverse brace,damage degree of suspender,wall thickness of arch rib steel pipe and arch axis coefficient were selected,and the stability of the continuous rigid-frame arch composite bridge was analyzed by defining the objective function K.Based on the parameter analysis of orthogonal test method,the optimal parameter combination of continuous rigid frame arch composite bridge was determined.Secondly,range analysis method and variance analysis method are used to analyze the objective function K to obtain the sensitivity and significance of structural design parameters.The results show that the arch rib cross-brace arrangement is the most sensitive parameter which has the greatest influence on the spatial stability of the continuous rigid arch composite bridge,and the sensitivity degree of the parameter is the arch rib cross-brace form,the damage degree of the suspenter,the steel tube wall thickness of the arch rib,and the arch axis coefficient in order from strong to weak.The optimal structural parameter combination is as follows:K-shaped cross brace,suspension rod damage area 5%,arch rib steel pipe wall thickness 55 mm,arch axis coefficient 2.2,stability coefficient increased by 63.12%compared with the original design scheme.