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以沈阳某单索面斜拉桥为研究背景,采用有限元理论,通过建立空间有限元模型研究了单索面斜拉桥主梁成桥阶段均布车载及偏载对控制截面最大负弯矩加载情况下截面的受力特性和负剪力滞效应。结果表明:在车辆荷载作用下,主梁各板产生了横向弯曲正应力及剪应力,使截面应力发生了变化;对控制截面最大负弯矩加载时,各控制截面剪力滞系数为0.64～0.983,主梁截面出现负剪力滞效应。偏载作用使得箱梁截面应力分布很不均匀,但其应力量值小于均匀车载作用下的应力水平,偏载工况并不控制箱梁截面设计。
Taking the single-cable-stayed cable-stayed bridge in Shenyang as a research background, finite element method was used to study the loading of maximum negative moment in the control cross-section of the single girder cable-stayed bridge Lower section of the force characteristics and negative shear lag effect. The results show that under the load of the vehicle, the transverse bending normal stress and shear stress are produced on the plates of the main girder, and the stress of the section changes. When the maximum negative moment of the control section is loaded, the shear lag coefficient of each control section is 0.64 ~ 0.983, negative shear lag effect appears on the girder section. The partial load makes the cross-section stress distribution of the box girder very uneven, but the stress value is less than the stress level under the uniform vehicle load. The partial load condition does not control the cross-section design of the box girder.