TY - EJOU
AU - Guo, Huajing
AU - Wu, Baijian
AU - Li, Zhaoxia
TI - Integrity Analysis on Existing Crane Runway Girders with Defects Using Constraint-Based R6 Criterion
T2 - Structural Durability \& Health Monitoring
PY - 2020
VL - 14
IS - 1
SN - 1930-2991
AB - 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.
KW - Crane runway girder; finite element; crack; structural integrity; constraint-based R6 failure criterion
DO - 10.32604/sdhm.2020.08442