Combined with a repaired project, an old twin decks bridge by simply supported the fabricated prestressed concrete hollow slabs with 16m span was detected in-site. The two decks were built separately in 1987 and 1997 because of economic reasons and demands of traffic flow. The aim of test was to decide whether the bridge can be further used or should be strengthened to meet the demands according to the current design code. Firstly, the damaged and corroded situations of whole bridge were investigated. Then the nondestructive testing methods were adopted to detect the concrete strength and carbonation depth of slabs and piers. The static loading test was conducted to make sure the service behaviors such as crack and mid-span deflection of the whole bridge. Finally, whole bridge was detected by dynamic loading test. The results show that the bridge has enough flexural stiffness to prevent larger deflection and most of slabs are in good service performance. But attacked by the environmental factor such as acid rain, CO2 and winds erosion etc., part of slabs, all railings and sidewalk flats should be replaced. Based on service conditions, the suggestions are given to recover the strength and durability of the bridge. The conclusions would serve as a reference for similar engineering structures.
In order to perfectly make the bridge function, structural style, architectural art modeling with the surrounding environment, this paper, based on the design of landscape five-span arch footbridge, studies the span arrangement, structural style, building materials, railing shape, ornament style and color, and lamplight illumination of the bridge considering the factors such as hydrology, geology, surrounding environment (e.g. buildings and park), traffic flow and entire urban planning. To reduce the stress of main arch and the horizontal thrust of substructure, the new structure of T-frame with sloped plate was put forward to bear the deck loads with the assistance of main plate arch. The thin concrete walls were cast on the top sides of the main plate arch, which were decorated by fine stone with the modern decoration construction technology. The white marble railings present lively morphology with carved lotus and pomegranate on the column cap, and many kinds of flowers on the panels. The spotlights make dramatic night sense for the bridge. Therefore, the landscape footbridge in the classical arch graceful shape was constructed by the modern building material and the optimized reinforced concrete structure, which presents the unity and coordination of structural design and artistic expression.
To ensure the construction quality, safety and reliability, according the design drawings, construction process and the related design code, this paper establishes the simulation model by the software of MIDAS/CIVIL for the analysis of construction control of the low tower cable-stayed bridge. The calculation results showed that the maximum cumulative horizontal displacement of the tower and vertical displacement of the beam is 13.8mm and 154mm respectively, which can be adjusted by setting camber. At completion state of the cable-stayed bridge, the stresses of the tower and the beam are both in compressive with the maximum of 14.47MPa and 14.03MPa respectively, which are both less than the limits of corresponding materials. The bridge is safe and reliable.
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