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针对斜拉桥双主肋主梁等工程实际,研究轴向荷载作用位置相对截面形心在横桥向对称偏移时的双主肋主梁剪力滞效应,推导了桥面板上任一点正应力和剪力滞系数的计算公式。结果表明:当轴向荷载横桥向作用位置从ξ=0向ξ=b对称移动时,桥面板将经历负剪力滞效应-无剪力滞效应-正剪力滞效应的变化过程,结论与有机玻璃模型Ansys解吻合良好。轴向荷载横桥向对称变位引起的双主肋主梁剪力滞效应明显,建议在结构设计时予以考虑。
According to the engineering practice of the main girder of double main rib of cable-stayed bridge, the shear lag effect of the main girder with double main ribs when the centroid of the cross-section of the axial load acting position is symmetrical transversely is studied. The normal stress And shear lag coefficient calculation formula. The results show that the bridge deck will experience the negative shear-lag effect and the positive shear lag effect when the axial load transversally moves from ξ = 0 to ξ = b. Conclusion Good agreement with plexiglass model Ansys solution. The shear lag effect of the double main rib main girder caused by the axial symmetrical displacement of the axial load is obvious, so it is suggested to consider it in the structural design.