A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Structural health of bridges : monitor, assess and retrofit
The research presented in this Licentiate thesis is intended to cover minor areas of the wide research area Structural Health Monitoring (SHM) of Civil Engineering Structures. SHM is broadly the knowledge maintaining our infrastructure by assessing the condition, often by monitoring or measurements, diagnose damages, analyse risk levels, by using inputs from measurements and diagnoses, and in the end retrofit, if needed. In particular the methodology and the interaction between the different parts in SHM, ranging from assessment to upgrading, are explained. The thesis give also a brief introduction to sensor technology, mainly designed for monitoring, and to damage detection methods in Civil Engineering structures, such as bridges. The thesis is of the form "combination thesis" which is characterised by a relatively extensive literature study and a summary of the research presented at the beginning. Beyond this, it contains four papers, which are summarised below. Paper A: "Concrete beams exposed to Live Loading during CFRP strengthening", presents how strengthening of concrete beams can be done without stopping the traffic during execution. Results show that no significant decrease of the strengthening effect exists when carbon fibre laminates and quadratic rods (NSMR), is bonded with an epoxy adhesive, which had cured during the cyclic loading. If a cementitious bonding agent is used, cyclic loading decrease the strengthening effect dramatically. Paper B: "Large scale hybrid composite FRP girders for use in bridge structures - theory, test and field application". This paper presents the possibility to build a bridge in full scale using fiber reinforced polymers. Numerical analysis, full scale tests and theoretical investigations shows full composite action between the constituents. Paper C: "CFRP Strengthening and monitoring of the Gröndals Bridge in Sweden" discuss the retrofit of a large concrete box bridge using CFRP laminates and how the strengthening effect can be monitored and verified using fibre ...
Structural health of bridges : monitor, assess and retrofit
The research presented in this Licentiate thesis is intended to cover minor areas of the wide research area Structural Health Monitoring (SHM) of Civil Engineering Structures. SHM is broadly the knowledge maintaining our infrastructure by assessing the condition, often by monitoring or measurements, diagnose damages, analyse risk levels, by using inputs from measurements and diagnoses, and in the end retrofit, if needed. In particular the methodology and the interaction between the different parts in SHM, ranging from assessment to upgrading, are explained. The thesis give also a brief introduction to sensor technology, mainly designed for monitoring, and to damage detection methods in Civil Engineering structures, such as bridges. The thesis is of the form "combination thesis" which is characterised by a relatively extensive literature study and a summary of the research presented at the beginning. Beyond this, it contains four papers, which are summarised below. Paper A: "Concrete beams exposed to Live Loading during CFRP strengthening", presents how strengthening of concrete beams can be done without stopping the traffic during execution. Results show that no significant decrease of the strengthening effect exists when carbon fibre laminates and quadratic rods (NSMR), is bonded with an epoxy adhesive, which had cured during the cyclic loading. If a cementitious bonding agent is used, cyclic loading decrease the strengthening effect dramatically. Paper B: "Large scale hybrid composite FRP girders for use in bridge structures - theory, test and field application". This paper presents the possibility to build a bridge in full scale using fiber reinforced polymers. Numerical analysis, full scale tests and theoretical investigations shows full composite action between the constituents. Paper C: "CFRP Strengthening and monitoring of the Gröndals Bridge in Sweden" discuss the retrofit of a large concrete box bridge using CFRP laminates and how the strengthening effect can be monitored and verified using fibre ...
Structural health of bridges : monitor, assess and retrofit
Hejll, Arvid (author)
2004-01-01
2004:46
Theses
Electronic Resource
English
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