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Monitoring and evaluation of shear crack initiation and propagation in webs of concrete box-girder sections.
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Engineering and Bridges.ORCID iD: 0000-0003-3586-8988
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Engineering and Bridges.
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Engineering and Bridges.
2006 (English)In: International Conference on Bridge Engineering - Challenges in the 21st Century, November 1-3, 2006, Hong Kong., Hong Kong: Civil Division, The Hong Kong Institution of Engineers , 2006Conference paper, Published paper (Other academic)
Place, publisher, year, edition, pages
Hong Kong: Civil Division, The Hong Kong Institution of Engineers , 2006.
National Category
Building Technologies
Identifiers
URN: urn:nbn:se:kth:diva-10146OAI: oai:DiVA.org:kth-10146DiVA: diva2:209517
Conference
International Conference on Bridge Engineering - Challenges in the 21st Century, November 1-3, 2006, Hong Kong.
Note

QC 20100730

Available from: 2009-03-25 Created: 2009-03-25 Last updated: 2016-09-05Bibliographically approved
In thesis
1. Predicting shear type crack initiation and growth in concrete with non-linear finite element method
Open this publication in new window or tab >>Predicting shear type crack initiation and growth in concrete with non-linear finite element method
2009 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

 

In this thesis, the possibility to numerically describing the behaviour that signifies shear type cracking in concrete is studied. Different means for describing cracking are evaluated where both methods proposed in design codes based on experiments and advanced finite element analyses with a non-linear material description are evaluated. It is shown that there is a large difference in the estimation of the crack width based on the calculation methods in design codes. The large difference occurs due to several of these methods do not account for shear friction in the crack face.

The finite element method is an important tool for analysing the non-linear behaviour caused by cracking. It is especially of importance when combined with experimental investigations for evaluating load bearing capacity or establishing the structural health. It is shown that non-linear continuum material models can successfully be used to accurately describe the shear type cracking in concrete. A method based on plasticity and damage theory was shown to provide accurate estimations of the behaviour. The methods based on fracture mechanics with or without inclusion of damage theory, overestimated the stiffness after crack initiation considerably. The rotated crack approach of these methods gave less accurate descriptions of the crack pattern and underestimated the crack widths. After verification of the material model, realistic finite element models based on plasticity and damage theory are developed to analyse the cause for cracking in two large concrete structures. The Storfinnforsen hydropower buttress dam is evaluated where the seasonal temperature variation in combination with the water pressure have resulted in cracking. With the numerical model the cause for cracking can be explained and the crack pattern found in-situ is accurately simulated. The model is verified against measurements of variation in crest displacement and crack width with close agreement. The construction process of a balanced cantilever bridge, Gröndal Bridge, is numerically simulated and a rational explanation of the cause for cracking is presented. It is shown that large stresses and micro-cracks develop in the webs during construction, especially after tensioning the continuing tendons in the bottom flange. Further loads from temperature variation cause cracking in the webs that is in close agreement with the cracking found in-situ. The effect of strengthening performed on this bridge is also evaluated where the vertical Dywidag tendons so far seem to have been successful in stopping further crack propagation.

 

Place, publisher, year, edition, pages
Stockholm: KTH, 2009. xiv, 43 p.
Series
Trita-BKN. Bulletin, ISSN 1103-4270 ; 97
Keyword
non-linear finte element analysis, concrete, crack width, crack propagation, shear
National Category
Building Technologies
Identifiers
urn:nbn:se:kth:diva-10156 (URN)
Public defence
2009-04-17, Sal F3, Lindstedtsvägen 26 (KTH), Stockholm, 10:00 (Swedish)
Opponent
Supervisors
Note
QC 20100730Available from: 2009-03-26 Created: 2009-03-25 Last updated: 2011-11-09Bibliographically approved

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