Restraint device between steel girder and concrete main tower of cable-stayed bridge

Abstract

The invention relates to a constraint device between a cable-stayed bridge main beam and a concrete main tower. A horizontal beam is arranged below the main tower. Semi-U-shaped arc face steel structure limiting stopping blocks are arranged on the two sides of a bridge center line through a prestress thick steel rib and an anchor bolt respectively in a connecting mode. The two semi-U-shaped arc face steel structure limiting stopping blocks form a whole semi-U-shaped arc face steel structure limiting stopping block, the U-shaped arc face steel structure limiting stopping block is in arc face contact with the contact face of a horizontal steel beam bracket. The horizontal beam is arranged below the main tower, the U-shaped arc face steel structure limiting stopping blocks are connected into the two sides of the bridge center line, borne horizontal force is transmitted to the steel main beam through a truss structure arranged between the horizontal beam and the steel main beam, then the horizontal force is converted to axial force borne by the main steel beam, the capacity for resisting horizontal resisting force is improved, and rotating constraint releasing is achieved by rotating of a steel plate arc face. According to the constraint device, the requirement for hinged constraint of large-tonnage horizontal load bearing can be met, and meanwhile additional bending stress generated by longitudinal horizontal load on the main steel rib can be lowered as much as possible.

Description

technical field [0001] The invention relates to a restraint device between a steel girder and a concrete main tower of a cable-stayed bridge. Background technique [0002] In bridge design, the constraints between the superstructure and substructure of the bridge are usually different types of supports. The support can bear the load generated by the vertical constraints. , the horizontal load capacity it can provide to resist horizontal constraints is low. Often only a few hundred tons. In the three-tower cable-stayed bridge, in order to meet the system stiffness requirements of the structure and reduce the live load displacement of the three-tower cable-stayed bridge, the middle tower is designed as a tower-beam hinged support system, that is, only the longitudinal and vertical two degrees of freedom in one direction, releasing the rotational constraints. The span of a cable-stayed bridge is very large, and the longitudinal horizontal force that needs to be restrained at...

AI Technical Summary

Problems solved by technology

The span of a cable-stayed bridge is very large, and the longitudinal horizontal force that needs to be restrained at the middle tower is often as high as 1,000 to 2,000 tons. The traditional support type restraint cannot meet the design requirements. The steel main beam will generate additional bending stress, which will have an extremely adverse effect on the force of the steel main beam

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