Reference Type:  Journal Article
Record Number: 1
Author: Ruan, X., Ma , H. Y. and Shi, X. F.
Year: 2015
Title: Fatigue life evaluation for cracked long-span continuous pc bridges
Journal: Advanced Steel Construction
Volume: 11
Issue: 3
Pages: 12
Start Page: 383
Short Title: Fatigue life evaluation for cracked long-span continuous pc bridges
DOI: 10.18057/IJASC.2015.11.3.11
Keywords: Continuous PC Bridge, Crack, Vehicular load, Fatigue life evaluation, Weight-in-motion, Stress range
Abstract: Long span pre-stressed concrete box girder bridges are widely constructed in China. Some typical deficiencies, such as unacceptable deflections and cracks in the concrete, often occur in those bridges with increasing service time. The deficiencies change the distribution of internal forces in the girders, which induces new problems, such as fatigue of reinforcements in the girders. In this paper, a fatigue life evaluation for a cracked long-span continuous PC bridges was conducted, which integrated weigh-in-motion (WIM) data and non-destructive examination (NDE) techniques. WIM data was used to investigate properties of vehicle load. The FE models of the cracked structure were developed to analyse the behaviour due to cracks. Various fatigue truck loads were considered in the models. Fatigue life evaluation based on real WIM data was developed to obtain the fatigue stress ranges due to the presence of cracks. Based on the analysis, the service life of the bridge was assessed before and after cracking at critical locations. A pre-stressed concrete box girder bridge, with three spans: 65m+100m+65m, was taken as an example to introduce the method. The present study provides better understandings of the post-cracking behaviour of long span continuous PC bridges. The outcome of this research can be efficiently utilized to reduce the risk of failure and achieve better management of the bridges.
Author Address: ATLSS Center, Lehigh University, PA, USA