Mechanical performances of box girder with corrugated steel webs under eccentric loading
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摘要: 通过空间有限元分析, 对影响其力学性能的高跨比、宽跨比、钢腹板的波纹形状及其板厚等几何参数进行了敏感性研究。结果表明, 减小高跨比和宽跨比、增大波形钢板的折叠角度、增加水平面板宽度以及增大钢腹板厚度可以改善结构在偏载作用时的受力性能。Abstract: With the finite element method, several geometrical parameters influencing its mechanical performances were analyzed. These parameters include the ratio of height and span, the ratio of width and span, corrugation configuration of steel web and the thickness of steel web. The results show that decreasing the ratio of height and span, the ratio of width and span, the configuration angle, horizontal panel width and the thickness of steel webs can improve its mechanical performances under eccentric loading.
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Key words:
- bridge engineering /
- corrugated steel web /
- box girder /
- eccentric loading /
- geometrical parameters
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图 7 波纹形状对钢腹板箱梁翘曲正应力的影响
Figure 7. Influence of corrugation on warping normal stress of box girder
图 8 钢腹板厚度对翘曲正应力的影响
Figure 8. Thickness influence of steel web on warping normal stress
图 9 应力增大系数随板厚比的变化
Figure 9. Variety of stress magnification coefficient with thickness ratio
表 1 不同高跨比下箱梁跨中底板角点的纵向应力
Table 1. Lognitudinal stress of bottom slab under different ratio of height and span
有限元模型 高度H/m 高跨比H/L 对称应力/MPa 偏载应力/MPa 应力增大系数 CASE-1 5.0 1/10.0 0.370 9 0.833 8 2.248 CASE-2 4.0 1/12.5 0.506 9 0.961 1 1.896 CASE-3 3.3 1/15.0 0.577 9 1.015 7 1.758 CASE-4 2.8 1/17.5 0.782 9 1.178 1 1.505 CASE-5 2.5 1/20.0 0.921 6 1.274 2 1.383 CASE-6 2.2 1/22.5 1.074 5 1.380 5 1.285 CASE-7 2.0 1/25.0 1.229 9 1.481 6 1.205 
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表 2 不同宽跨比下箱梁跨中底板角点的纵向应力
Table 2. Lognitudinal stress of bottom slab under different ratio of width and span
有限元模型 宽度W2/m 宽跨比W2/L 对称应力/MPa 偏载应力/MPa 应力增大系数 CASE-1 6.3 1/8 0.491 2 0.944 7 1.923 CASE-2 5.0 1/10 0.585 7 1.037 0 1.770 CASE-3 4.2 1/12 0.679 2 1.100 2 1.620 CASE-4 3.6 1/14 0.776 5 1.180 4 1.520 CASE-5 3.1 1/16 0.871 5 1.256 0 1.441 CASE-6 2.8 1/18 0.972 0 1.333 7 1.372 CASE-7 2.5 1/20 1.065 9 1.405 5 1.319
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