Journal of Jilin University(Engineering and Technology Edition) ›› 2023, Vol. 53 ›› Issue (6): 1669-1676.doi: 10.13229/j.cnki.jdxbgxb.20230075

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Vertical load distribution mechanism of new steel sleeper bridge deck used for assembled truss beam

Zhi-xing SUN1,2(),Shi-tong CHEN1,2(),Man ZHAO3,Hong-wei XU3,Zhe-xin CHEN4   

  1. 1.State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures，Shijiazhuang Tiedao University，Shijiazhuang 050043，China
    2.School of Safety Engineering and Emergency Management，Shijiazhuang Tiedao University，Shijiazhuang 050043，China
    3.School of Civil Engineering，Shijiazhuang Tiedao University，Shijiazhuang 050043，China
    4.Jinan Kingyue Highway Engineering Company Limited，Jinan 250101，China
  • Received:2023-01-28 Online:2023-06-01 Published:2023-07-23
  • Contact: Shi-tong CHEN E-mail:sunstar810@126.com;chst@stdu.edu.cn

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Abstract:

In order to solve the current situation that the reserve of existing bridge wooden sleepers is seriously insufficient and thus restricts the emergency use of assembled truss beams， a new type of steel sleepers instead of wooden sleepers was studied. To find out the vertical load distribution mechanism of the new steel sleeper used for assembled truss beam， full scale test of 4 m section and finite element simulation analysis were carried out. According to comparison between simulation and test， the influence of loading position， rail stiffness， chord stiffness， steel sleeper stiffness， and bridge vertical stiffness on vertical load distribution was discussed according to real bridge finite element model. It can be concluded that the actual distribution range of vertical load on the bridge sleepers is larger than the theoretical value. The steel sleeper at the position of chord joint bears larger proportion of load than the steel sleepers at the position between chord joints， and the stronger the support stiffness is， the larger the proportion of load is borne. The load extremum ratio of single sleeper borne decreases with the increase of rail stiffness， increases with the increase of steel sleeper stiffness， and has little relationship with the vertical stiffness of bridge structure. The increase of chord stiffness weakens the influence of loading position on the load extremum ratio of single sleeper born. The new type of steel sleeper can be applied to the deck of the assembled truss beams which are used to repair 16~32 m span bridges in common steel rail lines of Chinese railway. It can provide infrastructure support for the emergency repair of the assembled truss beams， and improve the reopened speed.

Key words: disaster prevention and mitigation engineering, steel sleeper, open deck, load distribution, assembled truss beam

CLC Number: 

  • U213.3

Fig.1

Front view of new steel sleeper bridge deck"

Fig.2

Load distribution test of steel sleepers of 4 m section"

Fig.3

Comparison of vertical load distribution of sleepers under three loading cases"

Table 1

Measured values and calculated values of the steel sleeper borned the maximum load of 4 m test section under each loading cases"

加载

工况

受力最大钢枕单枕承受轴重荷载最大百分比/%
试验值仿真值理论值荷载等级为207~759 kN的试验值波动差设计荷载为345 kN的试验值仿真值理论值

试验值/

仿真值

试验值/

理论值

C16#6#6#26.06~26.770.7126.3528.230.2693.487.1
C24#4#4#25.09~25.820.9225.3026.930.2694.183.6
C38#8#8#（9#）24.33~24.910.5824.3625.123.2397.1104.9

Fig.4

Maximum load borned results of single sleeper under each level of three loading cases"

Fig.5

Simulation model and loading cases of 16 m truss bridge"

Table 2

Load extremum ratio of single sleeper"

计算

工况

加载位置单枕荷载极值占比/%
1跨中上弦杆腹杆交叉节点28.6
2跨中左侧2 m位置上弦杆竖杆交叉节点27.6
3跨中左侧0.8 m位置钢枕正上方24.8
4跨中右侧1 m位置右侧节间跨中23.2
5跨中左侧4 m位置上弦杆腹杆交叉节点28.8
6跨中左侧6 m位置上弦杆竖杆交叉节点28.1

Fig.6

Maximum load borned results of single sleeper under each case of different types of rails"

Table 3

Load extremum ratio of single sleeper and the loading case of different types of rails"

轨道类型

对水平轴惯

性矩/cm4

单枕荷载极

值占比/%

加载工况
CHN45148934.26工况5
CHN50203731.90工况5
CHN60321728.76工况5
CHN75449026.68工况5

Fig.7

Maximum load borned results of single sleeper under each case of different types of chords"

Table 4

Load extremum ratio of single sleeper and the loading case of different types of chords"

弦杆编号

对水平轴惯

性矩/cm4

单枕荷载极值占比/%加载工况
313 14028.76工况5
50218 49528.18工况5
50123 85027.93工况5

Fig.8

Maximum load borned results of single sleeper under each case of different types of steel sleepers"

Table 5

Load extremum ratio of single sleeper and the loading case of different types of steel sleepers"

钢枕规格/mm惯性矩/cm4单枕荷载极值占比/%加载工况
F150×4807.8227.21工况5
F150×5982.1228.76工况5
F150×61145.9030.07工况5
F150×81411.8032.17工况5

Fig.9

Maximum load borned results of single sleeper under each case of different vertical stiffnesses of truss bridge"

Table 6

Load extremum ratio of single sleeper and loading case of different vertical stiffnesses of truss bridge"

桁梁跨度/m挠跨比

单枕荷载极

值占比 %

加载工况
161/242428.76工况5
241/105728.78工况5
321/50828.79工况5
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