A temperature self-adaptive tower beam along-bridge direction constraint method and system

Abstract

The invention discloses a temperature self-adaptive tower beam along-bridge constraint method. The method comprises the steps that firstly, the sectional area A of pull rods is determined according tofinite element calculation, then two pull rods are arranged on the two sides of a main beam between two main towers, one end of each pull rod is connected with a lower cross beam of the correspondingmain tower, and the other end of each pull rod is connected with the center point of a lower chord on the main beam. On the other hand, the invention also discloses a temperature self-adaptive towerbeam along-bridge constraint system which comprises two main towers, and each main tower is provided with a lower cross beam. And the main beam penetrates through the two main towers and is arranged on the lower cross beam, and lower chord members are arranged on the two sides of the main beam. Two pull rods are arranged on the two sides of the main beam between the two main towers, one end of each pull rod is connected with the lower cross beam of the corresponding main tower, and the other end of each pull rod is connected with the center point of the lower chord rod on the main beam. According to the invention, the stress condition of the main beam under the action of temperature and wind load and the action of live load can be effectively improved at the same time, and the beam end displacement of the main beam is reduced at the same time.

Description

technical field [0001] The invention relates to the field of restraint systems of long-span bridge structures, in particular to a temperature-adaptive tower girder restraint method and system along the direction of the bridge. Background technique [0002] At present, with the advancement of science and technology, bridge spans are constantly being refreshed. Long-span bridges have large spans and heavy loads. Under the action of wind load, temperature load and live load, the main girder will produce a large beam end displacement, and the main tower will produce a large bending moment. It is necessary to adopt appropriate technical solutions to improve the beam end displacement and the main tower bending moment. According to the traditional practice, damping constraint schemes, limit constraint schemes, and elastic cable constraint schemes are generally used between towers and beams. The above constraint scheme has the following disadvantages: [0003] (1) Damping constra...

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Problems solved by technology

However, this scheme constrains the deformation of the main beam under temperature load, increases the control bending moment of the main tower, and increases the cost of the main tower

And the elastic tie rod is generally longer, the tension force is lower, the sag effect is obvious, and the stiffness loss of the elastic cable is obvious

[0006] None of the existing restraint schemes can simultaneously improve the stress of the main girder under the action of temperature and wind load, and the main tower under the action of live load, and cannot simultaneously reduce the beam end displacement of the main girder

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