Journal of Jilin University(Engineering and Technology Edition) ›› 2022, Vol. 52 ›› Issue (6): 1362-1374.doi: 10.13229/j.cnki.jdxbgxb20210023

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Improvement of protective ability for existing low⁃grade concrete guardrail

Zhi ZHENG1,2(),Bo GENG2(),Fu-min WANG2,Jun-hong DONG1,Si-si WEI2   

  1. 1.School of Civil Engineering，Chongqing University，Chongqing 400045，China
    2.National Key Laboratory of Structural Dynamics of Bridge Engineering，China Merchants Chongqing Communications Technology Research and Design Institute Co. ，Ltd. ，Chongqing 400067，China
  • Received:2021-01-11 Online:2022-06-01 Published:2022-06-02
  • Contact: Bo GENG E-mail:zhengzhi@cqu.edu.cn;gengbo01@163.com

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Abstract:

Aiming at the problem of the protective capacity of the existing low-grade concrete guardrail does not match the traffic flow，a new composite guard plate which can be directly installed on the surface of concrete guardrail was proposed.A fine finite element model of vehicle-guardrail was established and the anti-collision performance of the new type combined guardrail was analyzed.Then，the protective performance of the GFRP-Concrete combined guardrail was compared with the existing concrete guardrail.The results indicate that the buffering and guiding performance of the combined guardrail is not affected， and the indexes are better than the existing concrete guardrail under the collisions of a light car and medium bus.When it was hit by a heavy truck，the concrete guardrail can not effectively suppress the roll and the vehicle will inevitably turn over.Combined guardrail can overcome to rollover and guide smoothly and the exit angle is only 0.32°.After the transformation，the protective energy of the combined guardrail reaches 290 kJ，and the protective capacity is 1.8 times than the existing low-grade guardrail.

Key words: engineering of communication and transportation system, combined guardrail, numerical simulation, protective capability, composite material

CLC Number: 

  • U417.1

Fig.1

Structural dimension and implementation effect of combined guardrail"

Fig.2

FE models of vehicles"

Table 1

Structural parameters of vehicle models"

车型整车质量/t重心高度/m尺寸（长×宽×高）/m
小型客车1.50.504.25×1.64×1.35
中型客车101.212.6×2.5×3.2
大型货车181.6010×2.5×2.9

Fig.3

FE models of combined guardrail"

Fig.4

Contact settings"

Table 2

Imapct conditions"

车型总质量/t碰撞速度/（km·h-1）碰撞角度/（°）碰撞能量/kJ
小型客车1.51002068
中型客车108020288
大型货车186020292

Fig.5

Comparison of vehicle angular displacement time histories"

Fig.6

Comparison of crash test and numerical simulation"

Fig.7

Energy curve of combined guardrail"

Fig.8

Acceleration time history curves of vehicle′s center of gravity"

Fig.9

Time history curves of light car impact force"

Fig.10

Collision angle variation of light car"

Fig.11

Trajectory of light car collision"

Fig.12

Wheel height variations"

Fig.13

Dynamic process under the light car collision"

Fig.14

Time history curves of medium bus impact force"

Fig.15

Collision angle variation of medium bus"

Fig.16

Trajectory of medium bus collision"

Fig.17

Vehicle tail height variations"

Fig.18

Vehicle dynamic extroversion value of medium bus"

Fig.19

Dynamic process under the medium bus collision"

Fig.20

Time history curves of heavy truck impact force"

Fig.21

Collision angle variation of heavy truck"

Fig.22

Height variations of the carriage box tai"

Fig.23

Vehicle dynamic extroversion value of heavy truck"

Fig.24

Dynamic process under the heavy truck collision"

Fig.25

Anti-rollover mechanism"

Fig.26

Guard plate damage"

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