Self-anchoring suspension cable and stay cable cooperative system bridge with girder having variable cross-section

Abstract

The invention discloses a self-anchoring suspension cable and stay cable cooperative system bridge with a girder having a variable cross-section. The self-anchoring suspension cable and stay cable cooperative system bridge comprises a main tower, a sidespan bridge pier, a girder, a main cable, stay cables and suspenders; the girder is supported by the main tower, the sidespan bridge pier, the main cable and the stay cables; the middle part of the girder is connected to the main cable by the suspenders, and the section height of the girder is gradually varied; the section height of the girder at the root of the main tower is the maximum, and the section heights at the middle point of the girder and the two ends of the girder are the minimum; the section height curve of the girder is symmetrical with respect to the vertical central line of the girder. According to the self-anchoring suspension cable and stay cable cooperative system bridge with the girder having the variable cross-section, through increasing rigidity of the girder, part of girder weight is directly delivered to the root of the main tower by the girder, part of bridge load is delivered to the main tower by the girder, axial force of the girder cable bearing structure delivered to the girder can be reduced, and pressure stress generated by the axial force can be reduced by increasing the section of the girder, thus being capable of avoiding risks of ultralimit of carrying capacity and buckling failure of the girder.

Description

technical field [0001] The invention relates to a bridge, in particular to a self-anchored suspension cable-cable-stayed cooperative system bridge with variable cross-section main girders. Background technique [0002] Over the past century, great achievements have been made in the development of bridge engineering, among which the system evolution and span breakthrough of cable-bearing bridges are one of the most important achievements. The so-called cable-bearing bridge refers to a bridge with cables (main cables of suspension bridges) or cables (stay cables of cable-stayed bridges) as the main load-bearing components. Cable-bearing bridges have two important characteristics: one is that the main stress-bearing components mainly bear axial force, and cables and cables bear axial tension; The second is that the cable, as the main force-bearing member, is made of high-strength material (generally high-strength steel wire), with high tensile strength and light weight. There...

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Problems solved by technology

[0010] The self-anchored suspension-cable-stayed cooperative system bridge usually adopts the method of transferring all the weight of the main girder to the main girder and the main tower by the suspender, main cable and stay cable. Due to the self-heaviness of the main girder, the axial force of the main girder will be too large, which will bring the danger of exceeding the ultimate bearing capacity and instability damage

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