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Journal of ZheJiang University (Engineering Science)  2024, Vol. 58 Issue (8): 1636-1646    DOI: 10.3785/j.issn.1008-973X.2024.08.011
    
Distribution law of shear stress of composite bridge deck and arrangement of transverse shear stud
Lianzhen ZHANG1(),Mou SONG1,Yusheng LI2,Wensheng FAN2,Honglin WU1,*()
1. School of Transportation Science and Engineering, Harbin Institute of Technology, Harbin 150090, China
2. Jiangxi Communications Investment Group Limited Company, Nanchang 330025, China
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Abstract  

The shear flow bearing ratio of concrete slab and steel roof was theoretically deduced according to the distribution law of shear stress and shear flow of composite bridge deck section under the condition of complete connection between concrete slab and steel roof. It was proved that the longitudinal shear force between layers of composite bridge deck is smaller than that calculated by the formula of composite beam. The finite element calculation of complete connection between layers and discrete connection of shear studs simulated by spring element supported this view, which verified the correctness of the view that the vertical shear force of composite bridge deck section was mainly borne by the web. The arrangement of shear studs in transverse direction was explored. Results show that the shear studs should be arranged along the transverse full width of the composite bridge deck, the shear studs should be densified on both sides of the web, and the shear studs should not be arranged directly above the web.



Key wordscomposite bridge deck      shear flow      longitudinal shear force between floors      shear stud      layout method     
Received: 15 July 2023      Published: 23 July 2024
CLC:  U 448  
Fund:  国家重点研发计划资助项目(2022YFC3801100).
Corresponding Authors: Honglin WU     E-mail: lianzhen@hit.edu.cn;wuhonglinhit@hit.edu.cn
Cite this article:

Lianzhen ZHANG,Mou SONG,Yusheng LI,Wensheng FAN,Honglin WU. Distribution law of shear stress of composite bridge deck and arrangement of transverse shear stud. Journal of ZheJiang University (Engineering Science), 2024, 58(8): 1636-1646.

URL:

https://www.zjujournals.com/eng/10.3785/j.issn.1008-973X.2024.08.011     OR     https://www.zjujournals.com/eng/Y2024/V58/I8/1636


组合桥面板切应力分布规律及横向剪力钉布置

根据组合桥面板截面的切应力、剪力流分布规律,在混凝土板和钢顶板完全连接的条件下,理论推导出混凝土板和钢顶板的剪力流承担比例,证明组合桥面板层间纵向剪力小于采用组合梁公式得到的计算值. 层间完全连接和通过弹簧单元模拟剪力钉离散连接开展的有限元计算均支持这一观点,验证了组合桥面板截面的竖向剪力主要由腹板承担的观点的正确性. 探究横向上剪力钉的布置方式. 结果表明,组合桥面板应沿横向全宽布置剪力钉,在腹板两侧进行加密,腹板正上方不宜布设剪力钉.


关键词: 组合桥面板,  剪力流,  层间纵向剪力,  剪力钉,  布置方式 
Fig.1 Distribution of shear stress and shear flow in I-shaped section
Fig.2 Schematic diagram of shear flow from web to top plate
Fig.3 Schematic diagram of shear flow from web into concrete slab and steel top plate
Fig.4 Stress relationship at intersection of concrete and steel top plate
Fig.5 Structural dimension of I-beam composite bridge deck
Fig.6 Simply supported finite element model of I-beam composite bridge deck structure
构件类型网格编号网格位置网格大小
混凝土板腹板两侧20 mm×30 mm
混凝土板腹板上方7 mm×30 mm
钢顶板腹板两侧20 mm×8 mm
钢顶板腹板上方7 mm×8 mm
钢腹板腹板7 mm×75.2 mm
钢底板腹板两侧36.25 mm×32 mm
钢底板腹板下方7 mm×32 mm
混凝土板、钢梁纵向50 mm
Tab.1 Meshing parameter of finite element model
材料种类E/MPaν
混凝土3.45×1040.2
钢材2.06×1050.3
Tab.2 Material characteristic of composite bridge deck structure
Fig.7 Load layout
Fig.8 Transverse shear stress distribution of I-beam composite deck slab flange
Fig.9 Linear descending segment fitting of transverse shear stress
ts/mmη
tc=15 cmtc=12 cmtc=10 cmtc=8 cm
100.7310.6850.6450.592
120.6940.6450.6020.547
140.6600.6090.5650.509
160.6300.5760.5310.476
180.6020.5470.5020.446
200.5760.5210.4760.421
Tab.3 Proportion of shear flow borne by concrete slab in combined bridge deck structure
Fig.10 Diagram of vertical shear force calculation
截面组成部分Vy/kN
混凝土板2.55
钢顶板0.829
钢腹板48.1
钢底板0.927
Tab.4 Vertical shear force distribution of section
Fig.11 Distribution of shear stress in cross-section of I-beam composite bridge deck slab
Fig.12 Longitudinal shear stress distribution on joint surface
Fig.13 Arrangement method of shear stud
Fig.14 Transverse shear stress distribution in flange plate after discrete connection
Fig.15 Distribution law of shear flow during shear stud connection
Fig.16 Calculation results of longitudinal shear force of shear stud
Fig.17 Three lateral arrangement methods of shear stud
Fig.18 Longitudinal shear force on shear stud in three arrangement methods
截面组成部分Vy/kN
混凝土板2.05
钢顶板0.868
钢腹板48.6
钢底板0.947
Tab.5 Calculation results of vertical shear force
剪力钉布置方式Vz/N
奇数均匀布置4384.50
偶数均匀布置4357.17
非均匀布置4778.57
现有理论计算9689.45
Tab.6 Sum of longitudinal shear force by single row shear stud
Fig.19 Cross section of composite bridge deck steel box girder
Fig.20 Load layout diagram
Fig.21 Layout of shear stud
Fig.22 Longitudinal shear force on shear stud with different arrangement method (1/4 cross section)
截面组成部分Vy/kN
混凝土板3.793
钢顶板0.146
钢腹板115.519
钢底板0.350
Tab.7 Calculation result of vertical shear force
剪力钉的布置方式Vz/N
均匀布置7 144.07
非均匀布置6 169.95
现有理论计算9 707
Tab.8 Sum of longitudinal shear force by steel box girder’s single row shear stud
Fig.23 Longitudinal shear force distribution of shear stud in cross-section at different encryption spacing for shear stud on both sides of web plate
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[1] Li-guo WANG,Xu-dong SHAO,Jun-hui CAO,Yu-bao CHEN,Guang HE,Yang WANG. Performance of steel-ultrathin UHPC composite bridge deck based on ultra-short headed studs[J]. Journal of ZheJiang University (Engineering Science), 2020, 54(10): 2027-2037.