Journal of Jilin University(Engineering and Technology Edition) ›› 2024, Vol. 54 ›› Issue (8): 2229-2237.doi: 10.13229/j.cnki.jdxbgxb.20231316

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Assessment method of resistant overturning stability safety factors of curved bridge under customized transport vehicles

Xue-lian GUO1(),Wan-shui HAN1,Tao WANG1(),Kai ZHOU1,Xiu-shi ZHANG2,Shu-ying ZHANG1   

  1. 1.Highway School，Chang'an University，Xi'an，710064，China
    2.Zhejiang Institute of Communications Co. ，Ltd. ，Hangzhou 310030，China
  • Received:2023-11-29 Online:2024-08-01 Published:2024-08-30
  • Contact: Tao WANG E-mail:guoxuelian@chd.edu.cn;wtbridge@chd.edu.cn

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Abstract:

To ensure the safety of curved bridges when the customized transport vehicles （CTVs） pass， a safety assessment method for resistant overturning stability was proposed based on forward and inverse reliability analysis. Firstly， considering two limit states which corresponding to conditions that the bridge cannot satisfy the safety redundancy and overturning abrupt， two levels of safety assessment functions were constructed， and the corresponding target reliability index analysis methods of two levels were proposed. Secondly， based on the inverse reliability theory， a two-level resistant overturning stability safety factor calculation model was established. Finally， the stability and safety of the typical three-span continuous curved bridge against overturning was evaluated. The results indicate that the proposed calculation model is reasonable and effective. When a typical three-span continuous curved bridge is equipped with a single support， it meets the safety requirements for anti-overturning， but has low safety reserves. It is recommended to optimize the design of the support form or take anti overturning measures.

Key words: bridge engineering, curved bridge, resistant overturning stability safety assessment, customized transport vehicles, reliability and inverse reliability analysis

CLC Number: 

  • U447

Fig.1

Framework of assessment method of resistant overturning stability safety factors of curved bridge under customized transport vehicle"

Table 1

Probability distribution characteristics and distribution parameters of variables"

变量

类型

变量描述分布类型

变量均值/

标准值 （κ）

变异系数 （δ）

几何尺寸

参数

支座间距正态分布1.00130.0081
荷载效应恒载效应正态分布1.01480.0431

大件运输车辆

荷载效应

正态分布1.00000.0368

Fig.2

Target reliability value of the CTV pass once of second-level safety assessment"

Fig.3

Calculating flow chart of inverse reliability analysis"

Fig.4

Iterative process of reliability values"

Fig.5

CTV-bridge coupling dynamic analysis"

Fig.6

Three boundary conditions of typical bridges"

Fig.7

Cross section of the typical bridge（unit：cm）"

Fig.8

Influence of radius on two levels safety factors of curved bridges"

Fig.9

Influence of boundary condition on safety factors"

Fig.10

Variation of safety factor with parameter probability distribution characteristics"

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