基于正交分析的双面组合连续箱梁剪力滞效应影响因素研究

A Study of Shear Lag Effect Influencing Factors in Double Steel-concrete Composite Continuous Box Girder Based on Orthogonal Analysis Method

考虑宽跨比、截面高度、翼缘板外伸长度、荷载类型等影响剪力滞效应的主要因素,采用正交分析方法对钢-混凝土双面组合连续箱梁进行试验设计,对设计工况进行数值仿真试验,并对计算结果进行正交分析。研究结果表明,荷载形式对双面组合箱梁剪力滞系数的影响最大,宽跨比的影响次之,而截面几何尺寸的因素如截面高度和翼缘板外伸长度在工程实用范围内的影响很小。通过统计回归,得到了弹性阶段钢-混凝土双面组合连续箱梁上翼缘有效宽度的无量纲计算公式。

The shear lag effect is determined by many factors,such as wide-span ratio,section height,flange overhang length,load type,and so on.The test specimens of double steel-concrete composite box girder are designed by orthogonal method.Then the numerical simulations are carried out according to different test conditions,and the results are orthogonally analyzed.It indicates that load type has the most significant influence to shear lag effect,followed by wide-span ratio,and section height and flange overhang length with very minor influence in engineering practice.The dimensionless formula of flange effective width is obtained for the double steel-concrete composite continuous box girder in elastic stage througn statistical regression.