Limitation of bridge's carrying bearing capacity due to aging and deterioration is a common problem faced by road administration and drivers. Rehabilitation of bridges including strengthening may be applied in order to maintain or upgrade existing bridge parameters. The case studies of strengthening of two small bridges with high modulus prestressed CFRP strips have been presented in the paper. The first one -reinforced concrete slab bridge -and the other -composite steel-concrete girder bridge -have been successfully upgraded with quite new technology. In both cases the additional CFRP reinforcement let increasing of bridge carrying capacity from 15 till 40 metric tons. The CFRP strip prestressing system named Neoxe Prestressing System (NPS), developed by multi-disciplinary team and tested at full scale in Rzeszow University of Technology, has been also described in the paper.

<p>The problem of bridge fire is growing. Because of bad experience in Warsaw, Poland local government decided to prove fire resistance of all bridge structures across Vistula river which pass through the city. One of such bridges is six spans continuous truss – 400 m long - with double deck: upper is concrete highway deck and lower is timber tramway deck. Possibility of occurrence of fire on tramway bridge with timber deck inclined the owner of the bridge to exchange whole deck and sleepers in particular. Because the load capacity of the bridge was drew out it was not possible to apply steel or concrete sleepers. Therefore the owner decided to fit up synthetic wood sleepers. To be sure that this kind of sleepers mounted on the bridge is safe special research program was introduced. The results of investigation proofed good structural material properties and good fire resistance of sleepers. Proposal of new structural solution of the bridge is also given.</p>

<p>The paper consists of three topics. First part presents results of investigation of 8 years old FRP truss footbridge working under static and dynamic loads. Second topic is devoted to ongoing research on joints of FRP pultruded profiles in bridge structure. Some kinds of mechanical and glued-mechanical connectors were tested in the laboratory and on real pedestrian bridge. The FEM models for verification are also presented. In the third part of paper, new build inclined steel arch footbridge with composite polymer curved in plane deck is shown. Main girder is filed partly with self-compacted concrete to fulfill dynamic comfort criteria for pedestrian bridges. Special attention is paid to dynamic analysis of the structure with taking into account the simulation of aerodynamic impact from lorries traveling under the bridge. Generally, the paper gives current state of art in design, construction and maintenance of FRP bridges in Poland.</p>

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