Eindcolloquium – Jelle Mensink
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Deformation Limits to be Used to Evaluate Deformation Measurements of Concrete Bridges
Within this research, the (time-dependent) deformation behaviour of concrete plate bridges is studied in order to derive deformation limits for assessment purposes. A finite element program is adopted to take creep, shrinkage, relaxation, settlement and thermal changes into account. To provide insight into the development of deformations of a plate bridge during its service life, a case study is used (i.e. Heemskerk bridge).
The time-dependent deformation behaviour of a bridge is a complex issue, since many different time-dependent mechanisms occur. Each mechanism or phenomena is dependent of the composition of materials, environmental conditions and applied loads over time. The parameters that have an influence on the (time-dependent) deformation behaviour of the bridge are varied. In particular, the most important parameters are concrete composition, environmental circumstances (RH and temperature) and load history.
For a realistic description of the deformation behaviour over time, phased calculations are required to account for these time-dependent effects. In addition, it still relatively unknown to what extent the material behaviour, according to Eurocode 2 (EC2) and CEB-fib Model Code 2010 (MC10) models, would affect the deformation behaviour of the slab. In this research, the time-dependent material properties are modelled according to Model Code 2010 and Eurocode 2. On the basis of the calculation results according to various design standards, a comparison is made between the calculated deformations of specific points on the deck and in-situ deformations derived from Rijkswaterstaat measurements. Wherein the sensitivity of parameters, (material) modelling reliability and measurement accuracy have been explored and quantified. Finally, current deformation monitoring options and capabilities are explored (i.e. levelling and InSAR) for future assessment, whence settlement, load changes and the seasonal response (i.e. thermal effects) can be derived over time.