Author(s): P. Banovec; S. Vosnjak; F. Steinman; R. Klasinc
Linked Author(s):
Keywords: Hydraulics; Bridge piers; Modeling; Verification
Abstract: Hydraulic analysis of bridge piers construction impacts was carried out on the Salzach river in Austria. The construction of a new bridge due to the expansion of the double track railway to three tracks foresees two new bridge piers in addition to the four existing ones. Since it is not possible to interrupt the traffic, a new parallel railway bridge has to be constructed first, and only afterwards the old piers will be removed. Since such a number of bridge piers will cause the conveyance reduction of the river, hydraulic modeling was demanded and performed at the Technical University Graz. A physical hydraulic model was constructed, and comparative mathematical modeling with two commercial two-dimensional, depth averaged mathematical models (SMS-RMA2 and Aquadyn) was carried out at the same time. Further on, an analysis was made of the impact of the necessary contraction of the river due to the construction pits for building of new piers or pulling down of the existing ones. A comparison of velocity magnitudes and distribution of velocities along the river section was made. The comparison showed deviations, which can be attributed to the locally higher threedimensionality of the flow, as well as different transverse distribution of calculated velocities.
Year: 2003