Overall composite towing beam arching structure for railway steel truss girder cable-stayed bridge

Abstract

The invention discloses an overall composite towing beam arching structure for a railway steel truss girder cable-stayed bridge, which aims to uniformly transfer a cable force to a main truss structure, has high integrity without generating greater stress concentration phenomenon at key parts such as a welding seam and the like, and improves the anti-fatigue performance of the structure. The structure comprises a pair of overall arch plates (11 and 12) and a steel anchor box (20), wherein the pair of overall arch plates (11 and 12) are formed by extending upwards directly from node plates on the two sides of the top chord of a main truss; the steel anchor box (20) is arranged between the upper parts of the pair of overall arch plates (11 and 12) and is fixed with the upper parts of the overall arch plates (11 and 12); a steel sleeve tube (N7) through which a stayed-cable can pass is fixedly arranged in the steel anchor (20); and the stayed-cable axis of the steel sleeve tube (N7) is crossed with the central line (1) of a node of the main truss, an upper chord system line (2) and a diagonal web member system line (3).

Description

technical field [0001] The invention relates to a railway steel truss girder cable-stayed bridge, in particular to a cable girder anchorage structure applied to a railway steel truss girder cable-stayed bridge. Background technique [0002] With the advancement of bridge construction technology, cable-stayed bridges have developed rapidly, and more and more long-span cable-stayed bridges have been designed and constructed. For long-span cable-stayed bridges, in order to reduce the structural weight and improve the strength of the structure, the main girder generally adopts a steel structure. The anchor connection between the stay cable and the steel beam is one of the key issues in the design. The cable-beam anchorage structure is an area with large local stress and complicated force transmission, and it needs to disperse the huge cable force transmitted from the stay cables to the main beam section. During the design, the force line should be as smooth as possible to avoi...

AI Technical Summary

Problems solved by technology

The main disadvantage of this anchor structure is that the anchor plate has serious stress concentration near the weld, and it is easy to have a plastic zone at the root of the weld.

[0008] In addition, the above-mentioned cable-beam anchorage structures are all used for steel box girders, but for steel truss girder cable-stayed bridges, the above-mentioned anchorage structures will have greater limitations

Images