A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Influence of load distribution on trough bridges
There are approximately 4000 railway bridges in Sweden and a common construction type is the short span concrete trough bridge. With the current standards the load distribution through ballast is assumed to be uniformly distributed with a distribution slope of 2:1 according to the Swedish Administration of Transport or 4:1 according to Eurocode 1. Previous research shows that there are a lot of factors that affects the load distribution through the ballast and that the distribution rarely is uniform. Different load patterns on bridges can result in different responses in the structure and it is possible that a more optimized evaluation of the loads could reduce the internal stresses in the bridge. There are gaps in the current literature regarding the structural response to different load patterns on reinforced concretetrough bridges and this master thesis aims to further the research in this area. This report will consist of a literature study where load distribution in ballast is researched in order to find what different load distributions are common and how different parameters affects the load distribution through the ballast. Further, a non-linear FE-model of a typical trough bridge in Sweden that was located in Lautajokki will be developed using ATENA Science. The model will be complete with ballast, sleepers and rails and will be calibrated using the results from a previous full-scale test on the Lautajokki bridge. Four more models will be developed without ballast, sleepers and ballast where the load distribution instead is modelled directly on top of the slab of the bridge. These models will be compared to the model with ballast, sleepers and rail (called the Full model) to see what load distribution that is the closest to reality and how the behavior of the bridge changes depending on the assumed load distribution. The parameters that will be tested and compared during this master thesis is the maximum load capacity, the stiffness, the crack patterns, the stresses in the reinforcement, the moments and ...
Influence of load distribution on trough bridges
There are approximately 4000 railway bridges in Sweden and a common construction type is the short span concrete trough bridge. With the current standards the load distribution through ballast is assumed to be uniformly distributed with a distribution slope of 2:1 according to the Swedish Administration of Transport or 4:1 according to Eurocode 1. Previous research shows that there are a lot of factors that affects the load distribution through the ballast and that the distribution rarely is uniform. Different load patterns on bridges can result in different responses in the structure and it is possible that a more optimized evaluation of the loads could reduce the internal stresses in the bridge. There are gaps in the current literature regarding the structural response to different load patterns on reinforced concretetrough bridges and this master thesis aims to further the research in this area. This report will consist of a literature study where load distribution in ballast is researched in order to find what different load distributions are common and how different parameters affects the load distribution through the ballast. Further, a non-linear FE-model of a typical trough bridge in Sweden that was located in Lautajokki will be developed using ATENA Science. The model will be complete with ballast, sleepers and rails and will be calibrated using the results from a previous full-scale test on the Lautajokki bridge. Four more models will be developed without ballast, sleepers and ballast where the load distribution instead is modelled directly on top of the slab of the bridge. These models will be compared to the model with ballast, sleepers and rail (called the Full model) to see what load distribution that is the closest to reality and how the behavior of the bridge changes depending on the assumed load distribution. The parameters that will be tested and compared during this master thesis is the maximum load capacity, the stiffness, the crack patterns, the stresses in the reinforcement, the moments and ...
Influence of load distribution on trough bridges
Gustafsson, Jacob (author)
2021-01-01
Theses
Electronic Resource
English
DDC:
624
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