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Integrity Analysis on Existing Crane Runway Girders with Defects Using Constraint-Based R6 Criterion

Huajing Guo, Baijian Wu, Zhaoxia Li*
Jiangsu Key Laboratory of Engineering Mechanics, Department of Engineering Mechanics, Southeast University, Nanjing, 210096, China
* Corresponding Author: Zhaoxia Li. Email:

Structural Durability & Health Monitoring 2020, 14(1), 37-50.

Received 25 August 2019; Accepted 05 November 2019; Issue published 01 March 2020


In order to resolve the safety problem of the existing crane runway girders (CRGs) with defects, the constraint-based R6 criterion is proposed to assess their structural integrity. The existing steel CRGs with defects at the weld joint between the upper flange and web plate, are characterized to three-dimensional finite element models with a semi-ellipse surface crack. The R6 criterion has been modified by considering the constraint effect which is represented by T-stress. The analysis results illustrate that working condition of the cracked CRGs leads to high constraint level along the crack front. The crack aspect ratio (a/c) and runway eccentricity (e) have significant influence on the integrity of the cracked CRGs. The integrity assessment results based on modified constraint-based R6 failure criterion enable to more effectively protect the cracked CRGs from brittle fracture failure.


Crane runway girder; finite element; crack; structural integrity; constraint-based R6 failure criterion

Cite This Article

Guo, H., Wu, B., Li, Z. (2020). Integrity Analysis on Existing Crane Runway Girders with Defects Using Constraint-Based R6 Criterion. Structural Durability & Health Monitoring, 14(1), 37–50.


This work is licensed under a Creative Commons Attribution 4.0 International License , which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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