Abstract
prestressed concrete continuous box girder in China. With the change of condition in the construction site, the construction sequence of the bridge will be changed inevitable, so to adjust the tendon tension mode accordingly, which will cause the alteration of structural mechanics performance. The finite element analysis model of a continuous girder will be built to compare the difference with two tendon tension cases according to relevant pouring sequence. The related conclusions are obtained, so can help to provide beneficial reference for the similar engineering.
Highlights
Rigid frame tied arch is a new type of bridge appearing in concrete filled steel tubular arch bridges, which is applied wider and wider in recent years
Different from the beam arch composite system, the arch ribs of the rigid frame tied arch bridge and the pier are consolidated without any supports, and the flexible strand is used as a tie bar to balance the thrust of the arch; The tie bar is independent of the bridge deck and does not take part in the force of the bridge deck system, while the bridge deck is a local baring member which have no contribution to the mechanics feature of the whole structure
The bridge deck is composed of steel cross beams, stiffening steel stringers and “π” type carriageway plates and cast-in-place integral layers
Summary
Rigid frame tied arch is a new type of bridge appearing in concrete filled steel tubular arch bridges, which is applied wider and wider in recent years. Different from the beam arch composite system, the arch ribs of the rigid frame tied arch bridge and the pier are consolidated without any supports, and the flexible strand is used as a tie bar to balance the thrust of the arch; The tie bar is independent of the bridge deck and does not take part in the force of the bridge deck system, while the bridge deck is a local baring member which have no contribution to the mechanics feature of the whole structure. The design load for highway –I class, the crowd load is 2.4kN/m2, the temperature change according to the structure of the overall ±20°C, the shrinkage of concrete structure is equivalent to reduce 20°C; adjust the creep is the additional stress caused by concrete shrinkage and temperature changes, the internal force multiplied by the creep coefficient 0.7 the change of temperature, the creep coefficient of concrete shrinkage force multiplied by 0.45
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