A tie-bar arch bridge with partial rigid connection between the arch beams

Abstract

The invention relates to a half-through bowstring arch bridge adopting a partial rigid connection mode among arched girders. According to the half-through bowstring arch bridge, arch ribs are fixedly connected with steel box edge girders of a bridge deck system by chain rods in the transverse direction; the steel box edge girders of the bridge deck system are connected with the arch ribs by rigid suspenders in the vertical direction; the bridge deck system has a longitudinal beam structure and is the steel box edge girders in the longitudinal direction, and the steel box edge girders are positioned in planes of the arch ribs; and the suspenders are rigid. According to the half-through bowstring arch bridge, the restraint of the arch ribs on a bridge deck is enhanced, and the integrality of the arch bridge is improved by the partial rigid connection mode among the arched girders, so that a force transferring path of the structure is simple and definite. Simultaneously, the displacement of the bridge deck system along the bridge direction is limited, the stress of the rigid suspenders under the action of temperature is reduced, the stress amplitude of the short rigid suspenders under the action of live loads is reduced, the fatigue performance of the suspenders is improved, and the service life is long; the arrangement of a large-tonnage damping device can be avoided; and the half-through bowstring arch bridge is simple in structure, and convenient to operate, construct and maintain.

Description

technical field [0001] The invention relates to a mid-support type tied-rod arch bridge structure, in particular to a mid-support type tied-rod arch bridge in which arch girders are partially rigidly connected. Background technique [0002] In the tie-bar bridge, the connection mode of the arch beam is a key structure. The connection mode of the arch beam reflects the strength of the boundary constraints at the beam end of the main beam, and determines the load on the beam, including the live load of the train, braking force, temperature force and force transmission path. [0003] At present, in China, the connection methods of the arch beams of the tie-bar arch bridge are as follows: [0004] (1) A crossbeam is set between the arch ribs at the junction of the arch beams, the main beam and the crossbeam are connected by a fixed support, and the other side is connected by a movable support; [0005] (2) A beam is also installed at the junction of the arch and beam, and the ...

AI Technical Summary

Problems solved by technology

[0009] c. Under the action of the train braking force, a large horizontal braking force is transmitted to the unilateral arch rib, resulting in excessive force on the unilateral arch rib

[0010] Although the method (2) has improved the above defects and theoretically solved the force transmission problem of the braking force, it still has the following disadvantages: under the live load of the train, the bending moment of the short boom along the bridge direction is relatively large, and the boom is fatigued. The problem is still not well resolved

[0011] Due to the existence of the above problems, especially the problem of the stress on the short suspenders is difficult to solve, some mid-through arch bridges have suffered accidents in which the short suspenders have broken and even the bridge deck has collapsed.

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