The architecture likes the landmark-bridges, it is very popular nowadays. In contrast the design and statics together play an important role (and they help each other) in the case of progressive structures so we would like to emphasize the importance of advanced structures. Our aim is to pick up the essential technical term of bridge building, to select and apply the correct structures and finally to have an overview of new structural solutions.
- connection between aesthetics (design) and statics
- types of bridge structures, history and classification of bridges
- functions of structural element, internal forces, loads and effects
- beam and truss bridges, static and aesthetic point of view, aesthetic examples
- arch bridges, static and aesthetic point of view, aesthetic examples
- integral bridges, static and aesthetic point of view, aesthetic examples
- suspension and stress-ribbon bridges, static and aesthetic point of view, aesthetic examples
- designing structural elements (sub- and superstructures), opportunities for improvement
- history of Budapest’s bridges
- design of bridge barriers, lights
- construction stages, temporary structures – consultation
Vigh, A., Kollár, L.P. (2006): Comparison of the axle loads for evaluating overweight vehicle permits, IABSE Symposium Budapest 2006 - Report, Vol. 92. 9 oldal (on CD)
Vigh, A., Kollár, L.P. (2004): An approximate method for calculating the routing and permitting of overweight vehicles over bridges, 5th International Ph.D. Symposium in Civil Engineering, Delft 2004 - Balkema Publishers 921-928.
Approximate analysis of bridges for the routing and permitting procedures of overweight vehicle
The permitting process of overweight vehicle requires the analysis of the load-bearing capacity of bridges. The dissertation presents a new method for comparing the mechanical effects of overweight vehicles and the design load vehicle such as the Hungarian „A” type vehicle. The method is based on three artificial influence lines. The main advantage of the method that it requires very few data only: the span(s) and the width of the bridge, the type of the superstructure, the axle loads and spacing of the design load vehicle and that of the overweight vehicle.
The calculation is fast, and robust. The method is applicable to simple span bridges, continuous girders, truss girders, arch bridges, frame bridges and solid spandrel arches.
More than 85000 calculations were carried out to verify the method. In most of the cases, the method is conservative; the maximum error on the unsafe side is 15 % for different bridge structures (the error on the unsafe side can also be compen-sated by applying a safety factor).
It can also take into account that the overweight vehicle may operate within reg-ular traffic or it may cross the bridge at a given lane position while any other traffic load is prohibited on the bridge.
This method can serve as the basic building block of permitting procedures of overweight vehicles. The algorithm can be connected to a bridge-databank, and to an optimization algorithm, and thus a fast and reliable tool is obtained to find the proper route of an overweight vehicle and thus permits can be issued automatically.
The presented method, together with the parameters, was built in a computer program, which is used, by the Technical and Information Services on National Roads – Hungary.