Abstract
The main objective of the present study is the assessment and retrofit of an existing road bridge that is located in Cyprus over the river Kouris. In particular the study concerns in a road bridge with seven spans of 10.5 m + 5 * 12.6 m + 10.5 m, a cross section width of 7.10 m and a 5 m piers height that was constructed in the early 50’s. The structural system of the bridge comprises of cast in situ reinforced concrete T-beams and slab deck that is simply supported on masonry piers. According to the new urban plan to design the bridge should now accommodate two lanes per direction, a pedestrian walkway and a cycling lane with total cross section width of new deck 15.60 m. The deck of the bridge widened using for aesthetic reasons the same cross section type and the new T-Beams and slab deck connected monolithically to the existing one. The existing part of the deck was strengthened with reinforced concrete jacketing due to inadequacy in shear resistance. Major challenge of the project posed the existing masonry pier layout that was insufficient to carry the new design seismic forces. New piers, founded on piles, were designed adjacent to the existing piers in order to support the new widened part of the bridge, and also to bear all the horizontal loads arising from the masses of the total deck. Sliding bearings (free movement) placed in the part of the bridge over the existing piers and elastomeric bearings with movement only in the longitudinal direction placed in the new piers.
Highlights
The main objective of the present study is the assessment and retrofit of an existing road bridge that is located in Cyprus over the river Kouris
Sliding bearings placed in the part of the bridge over the existing piers and elastomeric bearings with movement only in the longitudinal direction placed in the new piers
According to the new master plan of Episkopi Municipality the bridge has to be redesigned so as to accommodate one line per direction, sidewalks, and cycle lanes with a total width of new deck 14.60 m and new increased traffic and seismic loads
Summary
According to the new master plan of Episkopi Municipality the old national road has to be widened and upgraded in order to carry heavier traffic loads. A new cross section of the road was decided which accommodates two lanes per direction a pedestrian walkway and a cycling lane with total cross section width of the new deck 15.60 m. Following the above restrictions a detailed study was carried out in order to find the most economical and advanced solution for the river crossing. At the following pages we will present the proposed retrofit design that was selected as the most economical for the existing bridge, the advanced seismic solutions that were given so as to account for the high seismicity of the region and the new traffic loads as mentioned above. We should mention that the river has medium to high flow with a river bed of approximately 85 m thanks to the advanced structural solution no pier retrofit was required and so no riverbed rearrangement was needed leading to higher saving to the Municipally
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