复合空间索对大跨度铁路悬索桥横向刚度影响的研究

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摘要为提升大跨度铁路悬索桥的横向刚度，提出一种由主、副斜拉索组成的复合空间索结构。然后，基于材料有效利用率和静力分析，对复合空间索的直径、主斜拉索在加劲梁和地表的锚点位置、副斜拉索的数量等参数进行了优化。最后，采用风-车-桥耦合振动分析法，基于行车性能得到了桥梁横向挠跨比限值，分析了主、副斜拉索对横向挠跨比限值提升率的影响。结果表明：基于材料有效利用率，主斜拉索与加劲梁的锚点位置宜设在1/4主跨附近，且主斜拉索的地表锚点、加劲梁锚点与桥塔的垂直距离相等时最优，每组复合空间索中副斜拉索设置1根即可；在复合空间索的最优布置形式下，桥梁横向挠跨比可降低14.18%，横向挠跨比限值可提升16.79%。

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	向活跃1
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关键词 ：复合空间索, 铁路悬索桥, 风-车-桥系统, 横向挠跨比, 横向挠跨比限值

Abstract：To enhance transverse stiffness of a long-span railway suspension bridge, a composite-spatial cable structure consisting of main and secondary diagonal cables is proposed. Then, the parameters of diameter of composite-spatial cables, anchorages of main diagonal cables with stiffening beams and the surface, and the number of secondary diagonal cables on transverse deflection-span ratio of the bridge are optimized by the effective utilization of the materials and static analysis method. Finally, the analysis method for coupling vibrations of wind-vehicle-bridge system is used to obtain the limit of transverse deflection-span ratio of the bridge based on the driving performance, and the influence of the main and secondary diagonal cables on the enhancement rate of the limit of transverse deflection-span ratio is analyzed. The results show that on the basis of considering the effective utilization rate of composite-spatial cables, anchorages of main diagonal cables and stiffened beams should be located near 1/4 of the main span, and it is optimal when the vertical distance between anchorages of main diagonal cables with stiffening beams and the surface and the tower is equal, and it is enough to set a secondary diagonal cable for each group of composite-spatial cables; in the optimal layout of composite-spatial cables, transverse deflection-span ratio of the bridge can be reduced by 14.18%, the limit of transverse deflection-span ratio can be increased by 16.79%.

Key words： composite-spatial cable railway suspension bridge wind-vehicle-bridge system transverse deflection-span ratio the limit of transverse deflection-span ratio

收稿日期: 2023-09-04 出版日期: 2024-06-15

引用本文:

向活跃1,2，陶宇2，汪镇2，钟进坤2，李永乐1,2. 复合空间索对大跨度铁路悬索桥横向刚度影响的研究[J]. 振动与冲击, 2024, 43(11): 148-154.
XIANG Huoyue1,2, TAO Yu2, WANG Zhen2, ZHONG Jinkun2, LI Yongle1,2. Effects of composite spatial cables on transverse stiffness of a long-span railway suspension bridge. JOURNAL OF VIBRATION AND SHOCK, 2024, 43(11): 148-154.

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http://jvs.sjtu.edu.cn/CN/ 或 http://jvs.sjtu.edu.cn/CN/Y2024/V43/I11/148

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