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<p>The Non-Metal Bridge was developed to completely eliminate the use of steel members such as steel reinforcements and prestressing steel and it is expected to be able to reduce future maintenance costs. Aramid FRP rods were used as prestressing tendons to provide tensile force reinforcement. To eliminate the need for shear reinforcement, high strength fiber reinforced concrete with high shear strength was developed. That structure was conducted by wheel load running tests to verify the fatigue durability. After that, a half scale butterfly girder structure was built by using segmental method and tested to confirm that the structure of the joints between segments was sufficiently durable. Based on those results, the actual experimental bridge was built. This experimental bridge is part of a temporally road and its structural type is simple beam with 14 m of span length. The bridge was constructed by precast segmental method and has been used as a construction road since September of 2015.</p>

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<p>The sliding and rotation functions of the line bearings that support the floor framing stringers have diminished; thus, fatigue cracks have developed in the floor framing around the deteriorated bearings. Also, water that leaks from the expansion joints of the floor framing stringers has caused noticeable deterioration. To prevent further deterioration and damage, replacements of bearings supporting the floor framing stringers, and connection of floor framing stringers were proposed. To secure seismic performance, installations of vibration dampers between the end of the floor framing stringers and the main tower or anchorage were proposed. Additionally, installations of elastic restraining cables were proposed for stability both under normal conditions and during earthquakes. A dynamic analysis of a large-scale earthquake taking into consideration the elasto- plasticity of the steel members was conducted to check the seismic performance.</p>