吉林大学学报(工学版) ›› 2022, Vol. 52 ›› Issue (8): 1808-1816.doi: 10.13229/j.cnki.jdxbgxb20210197

• 交通运输工程·土木工程 • 上一篇    

正交异性钢⁃混组合桥面的轮载扩散效应

叶华文1(),段智超1,刘吉林1,周渝1,韩冰2   

  1. 1.西南交通大学 土木工程学院,成都 610031
    2.川南城际铁路有限责任公司,成都 610031
  • 收稿日期:2021-03-15 出版日期:2022-08-01 发布日期:2022-08-12
  • 作者简介:叶华文(1982-),男,副教授,博士.研究方向:钢桥疲劳行为和新型材料应用.E-mail: hbha2000@163.com
  • 基金资助:
    国家自然科学基金项目(51208430);四川省科技计划项目(2019YJ0223);大跨度公铁平层超宽幅钢箱梁斜拉桥关键技术研究项目(SRIG2019FW0001)

Wheel⁃load diffusion effect on orthotropic steel⁃concrete composite bridge deck

Hua-wen YE1(),Zhi-chao DUAN1,Ji-lin LIU1,Yu ZHOU1,Bing HAN2   

  1. 1.School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China
    2.Southern Sichuan Intercity Railway Co. ,Ltd. ,Chengdu 610031,China
  • Received:2021-03-15 Online:2022-08-01 Published:2022-08-12

摘要:

为研究轮载作用下正交异性钢-混组合桥面结构的竖向传力机制,提出横桥向的轮载扩散效应理论模型,并基于既有模型试验进行有限元分析,验证所提出的理论模型并进行参数分析。结果表明:与传统45°角均匀扩散假设不同,重载双轮作用下钢顶板横桥向上的压应力主要分布于轮载作用区域两道U肋范围内,轮载分担率可通过以U肋腹板为支点的三跨简支梁模型得到。常用设计参数取值范围内,提出的正交异性组合钢桥面的轮载分担规律偏保守,可为设计参考。

关键词: 桥梁工程, 正交异性钢-混组合桥面, 轮载, 扩散效应, 混凝土层

Abstract:

A theoretical model is proposed for the wheel-load diffusion to investigate the transmission mechanism of vertical loading on the steel-concrete composite bridge deck system under local wheel loads. An existed full-scale test model was referred and the corresponding finite element numerical simulation were also conducted to verify the presented model and analysis the key parameters. The results show that, rather than the traditional assumption of 45 degree diffusion effect, the pressure on the steel top plate of the composite deck under vehicle loads has a significant local effect along the transverse direction of U-rib, and the sharing law of the wheel load could be obtained from the 3-span beam simply supported by the webs of U-rib. The paramelric analysis shows that, the proposed theoretical model is conservative in the common value range of engineering parameter of orthotropic steel-concrete composite bridge deck, and it could be referred to the design of orthotropic composite bridge deck.

Key words: bridge engineering, orthotropic steel-concrete composite bridge deck, wheel load, diffusion angle, concrete overlay

中图分类号: 

  • U443.3

图1

三等跨简支梁分析模型"

图2

典型工况下钢桥面板轮载分担率计算模型"

图3

正交异性钢-混组合桥面板足尺模型(单位:mm)"

图4

空间有限元分析模型"

图5

跨中截面横桥向上横向应力分布"

图6

纵桥向上横向应力分布"

图7

挠度实测值与有限元值对比分析"

图8

钢面板竖向压应力分布"

图9

钢面板各区域轮载分担率"

表1

栓钉间距和直径影响效应"

栓钉间距

/mm

中心加载/%偏心加载/%栓钉直径 /mm中心加载/%偏心加载/%
δ1δ2δ1δ2δ1δ2δ1δ2
1509.6434.3723.2440.39910.1736.1925.2143.64
30010.0337.1324.5944.36139.6434.3723.2440.39
45010.5838.2526.0645.50179.8335.7524.7243.09
60011.3738.6625.2645.12259.6535.4024.4042.64

图10

混凝土弹性模量影响效应"

图11

混凝土层厚度影响效应"

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