Journal of Jilin University(Engineering and Technology Edition) ›› 2024, Vol. 54 ›› Issue (7): 1988-1996.doi: 10.13229/j.cnki.jdxbgxb.20221191

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Analysis on crack propagation of asphalt bridge deck pavement under water-force coupling action

Ya-ning CUI1,2,3(),Chun-di SI1,2,3(),Tao-tao FAN3,Fei WANG3   

  1. 1.State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures，Shijiazhuang Tiedao University，Shijiazhuang 050043，China
    2.Key Laboratory of Traffic Safety and Control of Hebei Province，Shijiazhuang 050043，China
    3.School of Traffic and Transportation，Shijiazhuang Tiedao University，Shijiazhuang 050043，China
  • Received:2022-09-14 Online:2024-07-01 Published:2024-08-05
  • Contact: Chun-di SI E-mail:cuiyaning@stdu.edu.cn;sichundi@stdu.edu.cn

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Abstract:

Cracks in pavement layer of asphalt mixture bridge deck will further cause looseness， pit and other diseases under water-load action. In order to reveal the influence of pore water pressure on the expansion of existing cracks under load， this paper established a finite element model of pavement layer of asphalt concrete continuous box girder bridge deck， and verified the correctness of the finite element model by field dynamic load test， taking dynamic deflection and modal of bridge as indexes. Then， longitudinal cracks are preset at the bottom of the upper layer of the deck paving layer， and the propagation effects of existing cracks on the deck paving layer under water-load coupling are studied by analyzing the variation of stress intensity factor KI and KII at the crack tip. It is found that the change of stress intensity factor （KI） reflects that the action of water pressure can promote the expansion of tensile cracks in pavement layer. The presence of water leads to the increase of KI value by about 50%， and the larger the hydrodynamic pressure is， the faster the expansion rate is. The hydrodynamic pressure has little effect on the expansion of shear cracks， and the stress intensity factor （KII） has little change. However， due to the presence of water， the response time of stress intensity factor becomes longer， so the water will have a continuous impact on the bridge deck paving layer.

Key words: road engineering, bridge deck pavement layer, crack propagation, water-load coupling, stress intensity factor

CLC Number: 

  • U414

Fig.1

Stress diagram of crack tip"

Fig.2

Stress diagram of crack tip"

Fig.3

3D model diagram"

Table 1

Material parameters of bridge deck pavement"

结构层厚度/cm模量/MPa泊松比密度/（kg·m-3）
ARHM-13411 5000.352550
ARHM-20890000.352521
C50—34 5000.37800

Fig.4

Cross-section of model"

Fig.5

Schematic diagram of dimensions of single-piece box girder"

Fig.6

Schematic diagram of symmetric load"

Fig.7

Mesh model of fracture area"

Fig.8

Schematic diagram of equivalent rectangular load"

Fig.9

Layout of measuring points"

Table 2

Parameters of the vehicle"

参数数值参数数值
车身长度8.675 m轴距4.050+1.350 m
车身高度3.6 m前轮距1.950 m
车身宽度2.55 m后轮距1.878 m
货厢长度5.6 m整车质量12.5 t
货厢高度1.5 m额定质量12.37 t
货厢宽度2.35 m总质量25 t
车头高度1.75 m轮胎规格12.00R20
青岛解放 JH6自卸式重卡（三轴）
车辆实际称重质量：50 510 kg

Fig.10

Field test diagram"

Fig.11

Mid-span displacement at different vehicle speeds"

Fig.12

Simulated vertical displacements at various speeds"

Table 3

Comparative analysis of dynamic deflection results"

车速/（km·h-1）现场试验/mm数值仿真/mm误差/%
200.9471.005.6
301.1541.2246.07
400.9741.0336.06
501.1151.0089.60

Fig.13

The first three modes of field test"

Fig.14

First 3 modes of finite element simulation"

Table 4

Comparative analysis of modal results"

模态阶数实测模态/Hz仿真模态/Hz误差/%
1阶3.2243.2480.73
2阶3.7683.7820.37
3阶6.0095.8013.45

Fig.15

Crack stress intensity factor KI under traffic load"

Fig.16

Crack stress intensity factor KII under traffic load"

Fig.17

Crack stress intensity factor KI underwater-load coupling action"

Fig.18

Crack stress intensity factor KII under water-load coupling action"

Fig.19

Crack stress intensity factor KI under 1.1 MPa for each working condition"

Fig.20

Crack stress intensity factor KII under 1.1 MPa for each working condition"

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