Journal of Jilin University(Engineering and Technology Edition) ›› 2021, Vol. 51 ›› Issue (6): 2068-2078.doi: 10.13229/j.cnki.jdxbgxb20200670

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Influencing factors and structural optimization of main cable saddle bearing capacity of suspension bridge

Chang-jun ZHONG1,2(),Zhong-bin WANG3(),Chen-yang LIU1   

  1. 1.School of Civil Engineering，Southwest Jiaotong University，Chengdu 610031，China
    2.School of Civil Engineering，Southeast University，Nanjing 211189，China
    3.China Railway Bridge Survey and Design Institute Group Co. ，Ltd. ，Wuhan 430050，China
  • Received:2020-09-03 Online:2021-11-01 Published:2021-11-15
  • Contact: Zhong-bin WANG E-mail:793713337@qq.com;wangzb@bri.com.cn

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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

CLC Number: 

  • U448.25

Fig.1

Schematic diagram of preliminary design of main cable saddle of Longtan Bridge"

Fig.2

Schematic diagram of main saddle parameters"

Table 1

Radial load calculation table"

Fcnnsrvfsr/（N·mm－1）fsrp/MPa
446 579131269 0005 12030.66
446 579121269 0004 72665.63
446 579111269 0004 33260.17
446 579101269 0003 93854.70
446 57991269 0003 54449.23
446 57981269 0003 15043.76
446 57971269 0002 75741.14

Fig.3

Saddle design load and boundary conditions"

Fig.4

Schematic diagram of finite element model"

Fig.5

Schematic diagram of key points"

Fig.6

Influence of cast steel material onbearing capacity"

Fig.7

Influence of welding plate material onbearing capacity"

Fig.8

Influence of transverse rib thickness onbearing capacity"

Fig.9

Influence of saddle groove wallthickness on bearing capacity"

Fig.10

Set the stiffening longitudinal rib or not the transverse rib midpoint displacement-load multiple curve"

Fig.11

Influence of the thickness of the middlelongitudinal rib on bearing capacity"

Fig.12

Influence of the lateral size reduction of thesaddle on the bearing capacity"

Fig.13

Influence of the number of transverseribs on the bearing capacity"

Fig.14

Parameter sensitivity analysis"

Fig.15

Load-displacement curve of key pointsconsidering the combined influence ofcross rib thickness and saddlegroove wall thickness"

Fig.16

Analysis of the bearing capacity ofsaddle at each optimization stage"

Table 2

Changes in cable saddle qualityin each optimization stage"

优化阶段索鞍质量/kg
铸钢Q345R总计
设计尺寸77 49888 966166 464
BH100-CB6065 75288 670154 422
不设置加劲纵肋65 75281 536147 288
横向缩减300 mm63 59870 916134 514
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