基于刚度协调的路桥过渡段路面疲劳寿命预估
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U416.2

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国家自然科学基金(51369010);桥头搭板处沥青路面结构刚度协调优化研究(桂科AD-19110085);高温地区半刚性基层沥青路面抗车辙结构形式研究(桂科能2018-A-01)


Fatigue life prediction of road-bridge transition section pavement based on stiffness coordination
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    摘要:

    为了克服路与桥显著的沉降差异,从本质上解决桥头跳车问题,通过刚度协调分析方法,采用abaqus建立五层体系三维有限元模型,以断裂力学为基础,分析了单因素和多因素作用下路桥过渡段面层路面性能的变化规律,进而建立了结构组合和力学控制指标多因素疲劳寿命预估模型。结果表明:应力强度因子KⅡ 随着面层与基层、面层与搭板层、面层与土基刚度差的减小而递减。面层疲劳寿命随着面层模量、轴载增长而减小,随着面层厚度、基层厚度、基层模量、搭板层厚度、搭板层模量、土基模量、车速增长而增大;对路面疲劳寿命敏感性次序为:面层厚度>车速>土基模量>轴载>搭板层厚度>基层厚度>面层模量>基层模量>搭板模量。研究成果可为我国桥头搭板处沥青路面合理设计提供相应的理论支撑,同时为我国疲劳寿命研究提供一种新方法。

    Abstract:

    In order to overcome the significant settlement difference between the road and the bridge and to essentially solve the bridge head jumping problem, a five-layer system three-dimensional finite element model was established by abaqus through the stiffness coordination analysis method, and the change law of the road and bridge transition section surface pavement performance under the action of single and multi-factor was analyzed based on fracture mechanics, and then a multi-factor fatigue life prediction model was established for the structural combination and mechanical control index The results show that: the stress intensity factor KII The results show that the stress intensity factor KⅡ decreases with the decrease of the stiffness difference between the surface layer and the subgrade, the surface layer and the lap layer, and the surface layer and the soil base. The fatigue life of surface layer decreases with the increase of surface layer modulus and axle load, and increases with the increase of surface layer thickness, base layer thickness, base layer modulus, lap layer thickness, lap layer modulus, soil base modulus and vehicle speed; the order of sensitivity to fatigue life of pavement is: surface layer thickness > vehicle speed > soil base modulus > axle load > lap layer thickness > base layer thickness > surface layer modulus > base layer modulus > lap plate modulus. The research results can provide the corresponding theoretical support for the rational design of asphalt pavement at the bridge head lap in China, and also provide a new method for the fatigue life research in China.

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栾利强,文双寿,张婧怡,等. 基于刚度协调的路桥过渡段路面疲劳寿命预估[J]. 科学技术与工程, 2022, 22(12): 5027-5035.
Luan Liqiang, Wen Shuangshou, Zhang Jingyi, et al. Fatigue life prediction of road-bridge transition section pavement based on stiffness coordination[J]. Science Technology and Engineering,2022,22(12):5027-5035.

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  • 收稿日期:2021-07-21
  • 最后修改日期:2022-01-18
  • 录用日期:2021-11-30
  • 在线发布日期: 2022-05-07
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