悬索桥主索鞍承载力影响因素及结构优化

doi:10.13229/j.cnki.jdxbgxb20200670

摘要/Abstract

摘要：

为了解决主索鞍安全性与经济性间的矛盾，对主索鞍极限承载力及其影响因素进行了研究。通过对悬索桥主索鞍结构设计参数进行归纳和总结，利用Autodesk Inventor软件建立了参数化几何模型，导入大型通用有限元软件ABAQUS中进行大量数值模拟，系统研究了主索鞍承载力影响因素及其变化规律，并对结构进行合理优化。结果表明：原设计索鞍的极限承载力为设计荷载的3倍，具有足够的安全储备；铸钢材料强度对主索鞍承载力有很大影响，而容器钢材料强度对主索鞍承载力的影响很小；横肋厚度及数量对索鞍承载力有很大影响，鞍槽侧壁厚度、是否设置横肋的纵向加劲肋以及腹板厚度对索鞍承载力的影响较小；随着索鞍横向尺寸的减小，索鞍横向刚度和极限承载力也随之下降；优化后的索鞍其极限承载力降低了10%，但用钢量降低了20%。

关键词: 桥梁工程, 主索鞍, 极限承载力, 参数分析, 结构优化

Abstract:

In order to solve the contradiction between the safety and economy of the main saddle of suspension bridge, the ultimate bearing capacity and influencing factors of the main saddle were studied. By summarizing the design parameters of the main saddle structure of the suspension bridge, the parametric geometric model is established using Autodesk Inventor software, and the large-scale general finite element software ABAQUS is imported for large number of numerical simulation studies. The influencing factors of the cable saddle bearing capacity and their changing law are investigated, and the reasonable optimization of the structure is performed. The analysis results show that the ultimate bearing capacity of the original design cable saddle is 3.00 times the design load, which has sufficient safety reserves. The strength of cast steel material has great influence on the bearing capacity of the main cable saddle, while the material strength of the container steel has little influence. The thickness and number of the transverse ribs has a great influence on the load-bearing capacity of the saddle. The thickness of the sidewall of the saddle groove, whether the longitudinal stiffener is provided with transverse ribs, and the thickness of the web have less influence on the load-bearing capacity of the saddle. The transverse rigidity and ultimate bearing capacity of the saddle will decrease with reduction of the transverse size of the saddle. The ultimate bearing capacity of the optimized saddle is reduced by 10%, while the steel consumption is reduced by 20%.

Key words: bridge engineering, main cable saddle, ultimate bearing capacity, parameter analysis, structural optimization

中图分类号:

U448.25

钟昌均,王忠彬,柳晨阳. 悬索桥主索鞍承载力影响因素及结构优化[J]. 吉林大学学报(工学版), 2021, 51(6): 2068-2078.

Chang-jun ZHONG,Zhong-bin WANG,Chen-yang LIU. Influencing factors and structural optimization of main cable saddle bearing capacity of suspension bridge[J]. Journal of Jilin University(Engineering and Technology Edition), 2021, 51(6): 2068-2078.

图/表 18

图1

图2

表1

径向荷载计算表"

$F c$	$n$	$n s$	$r v$	$f s r$ /（N·mm^－1）	$f s r p$ /MPa
446 579	13	126	9 000	5 120	30.66
446 579	12	126	9 000	4 726	65.63
446 579	11	126	9 000	4 332	60.17
446 579	10	126	9 000	3 938	54.70
446 579	9	126	9 000	3 544	49.23
446 579	8	126	9 000	3 150	43.76
446 579	7	126	9 000	2 757	41.14

表1

图3

图4

图5

图6

图7

图8

图9

图10

图11

图12

图13

图14

图15

图16

表2

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优化阶段	索鞍质量/kg
优化阶段	铸钢	Q345R	总计
设计尺寸	77 498	88 966	166 464
BH100-CB60	65 752	88 670	154 422
不设置加劲纵肋	65 752	81 536	147 288
横向缩减300 mm	63 598	70 916	134 514