Journal of Jilin University(Engineering and Technology Edition) ›› 2021, Vol. 51 ›› Issue (2): 597-603.doi: 10.13229/j.cnki.jdxbgxb20200002

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Effective strength improvement of global critical strength branch and bound method

Kai GAO1(),Gang LIU1,2()   

  1. 1.College of Civil Engineering，Chongqing University，Chongqing 400045，China
    2.The Key Laboratory of New Technology for Construction of China in Mountain Area of the Ministry of Education，Chongqing University，Chongqing 400045，China
  • Received:2020-01-03 Online:2021-03-01 Published:2021-02-09
  • Contact: Gang LIU E-mail:gk1988@cqu.edu.cn;gliu@cqu.edu.cn

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Abstract:

In view of the existing failure mode search method， the global critical strength branch and bound method， the failure element is directly deleted in the effective strength calculation without considering the dead load and internal force redistribution. The failure mode searched by this method is not consistent with the actual failure path of the structure. Therefore， a more comprehensive method to reflect the failure mode of bridge is proposed. The dead load effect of the structural failure element was applied to the adjacent structures as part of the external load. Considering the redistribution of the internal force of the structure， the internal force and effective strength of the remaining structural system element was optimized. The improved branch and bound method was established. A continuous rigid frame bridge was used to verify the improved method. The results show that the main failure mode of the continuous rigid frame bridge is obtained by the improved method， and the failure path is consistent with the actual damage situation of the bridge， and the failure mode of the bridge structure system is not missed.

Key words: bridge engineering, failure mode, improved branch and bound method, dead load effect, internal force redistribution

CLC Number: 

  • U447

Fig.1

Simple model of mid-span for continuous rigid frame bridges"

Fig.2

Finite element model of rigid frame bridge"

Fig.3

Main failure tree generated by GCBB method"

Fig.4

Main failure tree generated by IGCBB method"

Table 1

Reliability index and failure probability of each failure mode"

失效模式可靠指标β失效概率Pf
26→494.96793.3835×10-7
26→504.95713.5786×10-7
26→515.09531.7411×10-7
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