Multi-tower diagonal cable bridge provided with double-row support system

Abstract

The invention discloses a multi-tower diagonal cable bridge provided with a double-row support system, and belongs to the technical field of bridges. The multi-tower diagonal cable bridge provided with the double row support system is characterized in that multiple cable bent towers are arranged on the multi-tower diagonal cable bridge, the tops of the cable bent towers are connected with a main beam through stay ropes, and the two sides of the cable bent towers along the direction of the bridge are provided with tower beam vertical supports at certain intervals for enabling the two sides of the cable bent towers to support the main beam. According to the multi-tower diagonal cable bridge provided with the double-row support system, under the live load action of an automobile, the vertical displacement of the main beam and the longitudinal displacement of a tower top of the double row support system are basically consistent with those of a tower beam solidifying system, so that the vertical rigidity problem of a main beam of a multi-tower diagonal cable bridge with a weak tower structure is solved; the tower bottom bending moment of a floating type double row support system under the temperature load effect is far smaller than that of the tower beam solidifying system and that of a semi-floating system, so that the problem of overlarge cable bent tower load stress existing in the tower beam solidifying system is effectively solved by the adoption of the double row support system.

Description

technical field [0001] The invention relates to the technical field of bridges, in particular to a multi-tower cable-stayed bridge adopting a double-row support system. Background technique [0002] The mechanical behavior of the multi-tower cable-stayed bridge will change to a certain extent with the increase of the number of cable-towers. When one (ordinary double-tower cable-stayed bridge) is gradually increased to six, the change law of the load response of the structure under the load of vehicle load, temperature and other loads such as internal force of tower top displacement and main girder displacement. In the finite element model of the multi-tower cable-stayed bridge with each number of towers, the structures of cable towers, cables and main girders adopt the structural scheme of Jiashao Bridge, and the structure system of towers and girders adopts a semi-floating system. [0003] ⑴ Automobile live load response law: [0004] The vehicle live load is taken as the...

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Problems solved by technology

[0019] The purpose of the present invention is to provide a multi-tower cable-stayed bridge with a double-row support system in view of the above-mentioned problems. The longitudinal displacement of the top is basically the same as the tower-beam consolidation system, which solves the problem of the vertical stiffness of the main girder of the multi-tower cable-stayed bridge with weak tower structures; the bending moment of the tower bottom under the temperature load of the floating double-row support system is much smaller than The beam consolidation system is also smaller than the semi-floating system. The double-row support system effectively avoids the problem of excessive temperature and load on the cable tower that exists in the tower beam consolidation system.

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