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Time-dependent analyses of segmentally constructed balanced cantilever bridges.
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Concrete Structures.
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Engineering and Bridges.
2010 (English)In: Engineering structures, ISSN 0141-0296, E-ISSN 1873-7323, Vol. 32, no 4, 1038-1045 p.Article in journal (Refereed) Published
Abstract [en]

Segmentally constructed concrete cantilever bridges often exhibit larger deflections than those predicted by the design calculations The slender and long spans in combination with the fact that permanent loads are only partially compensated for by prestressing are reasons for the large deflections that increase during the life time of the bridge, although at a decreasing rate The rate of drying shrinkage may be one reason for the accelerating displacement of cast-in-place bridges The construction of continuous spans instead of introducing joints has both comfort and durability advantages The continuous span is however more complicated to design, and secondary restraint moments due to creep, shrinkage and thermal effects develop at the connection The results of analyses of the stepwise cast-in-place construction of a balanced cantilever bridge with time-dependent material properties show both higher deflect ion than those originally assumed in the design calculations and high stresses in the webs due to stressing of the tendons in the bottom flange The analyses show significant effects of creep during cantilevering and of a non-uniform drying shrinkage rate on the continuous bridge

Place, publisher, year, edition, pages
2010. Vol. 32, no 4, 1038-1045 p.
Keyword [en]
Balanced cantilever; Segmental construction; Cast-in-place; Creep; Shrinkage; Deflection
National Category
Building Technologies
URN: urn:nbn:se:kth:diva-10149DOI: 10.1016/j.engstruct.2009.12.030ISI: 000276382200012ScopusID: 2-s2.0-77649179922OAI: diva2:209526

QC 20100730

Available from: 2009-03-25 Created: 2009-03-25 Last updated: 2016-05-18Bibliographically 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.
Trita-BKN. Bulletin, ISSN 1103-4270 ; 97
non-linear finte element analysis, concrete, crack width, crack propagation, shear
National Category
Building Technologies
urn:nbn:se:kth:diva-10156 (URN)
Public defence
2009-04-17, Sal F3, Lindstedtsvägen 26 (KTH), Stockholm, 10:00 (Swedish)
QC 20100730Available from: 2009-03-26 Created: 2009-03-25 Last updated: 2011-11-09Bibliographically approved

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