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A construction control method for cable-stayed bridges with double cables simultaneously tensioned and under stress-free state

A stress-free state, cable-stayed technology, applied to cable-stayed bridges, bridges, bridge forms, etc., can solve problems such as large construction control errors, and achieve the effects of improving accuracy, increasing economic benefits, and improving engineering construction efficiency

Active Publication Date: 2017-08-01
SHANGHAI PUDONG ARCHITECTURAL DESIGN & RES INST
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Problems solved by technology

In the existing technical methods, the principle model of cable-stayed cable tension-free length control is limited to single-cable tensioning. However, in actual construction, two cables are usually required to be tensioned at the same time. Large construction control error

Method used

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  • A construction control method for cable-stayed bridges with double cables simultaneously tensioned and under stress-free state
  • A construction control method for cable-stayed bridges with double cables simultaneously tensioned and under stress-free state
  • A construction control method for cable-stayed bridges with double cables simultaneously tensioned and under stress-free state

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Embodiment Construction

[0040] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. This embodiment is carried out on the premise of the technical solution of the present invention, and detailed implementation methods and specific operation processes are given, but the protection scope of the present invention is not limited to the following embodiments.

[0041] Such as figure 1 As shown, for a cable-stayed bridge, M represents the tension end of the main girder of the cable-stayed cable, and N represents the tension end of the main tower of the cable-stayed cable. When the two cables are stretched simultaneously, the elastic stiffness of the main beam at the tension end is K M1 and K M2 , the elastic stiffness of the main tower is K N , the elastic moduli of 1# and 2# cables are E 1 and E 2 , and the cross-sectional area is A 1 and A 2 , the tensions of 1# and 2# cables are T 1 and T 2 , and the stress-free length ar...

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Abstract

The invention relates to a cable-stayed bridge double-cable simultaneous tensioning unstressed state construction control method. The method comprises the following steps of building a cable-stayed bridge whole finite element model; calculating the stay cable unstressed length in the target finished bridge state; setting stay cable initial tensioning force and calculating the corresponding stay cable initial unstressed length; building a double-cable simultaneous tensioning unstressed state control model, and calculating model parameters under the cable-stayed bridge folding state; according to the unstressed length of the stay cable in the target finished bridge state, the initial unstressed length and the model parameters, obtaining the corresponding stay cable tensioning force adjusting amount; according to the calculated tensioning force adjusting amount, performing stay cable tensioning force adjusting construction. Compared with the prior art, the method can be used for the double-cable symmetric tensioning phenomenon, can also be used for the double-cable asymmetric tensioning phenomenon, solves the problem of application limitation of a traditional unstressed state control method in cable-stayed bridge construction control, and can forcefully push engineering application and improve the cable-stayed bridge building technological level.

Description

technical field [0001] The invention relates to a construction control method of a cable-stayed bridge, in particular to a construction control method of a cable-stayed bridge in a stress-free state with two cables simultaneously stretched. Background technique [0002] The stress-free state control method is a theoretical method for the forming control of bridge construction in stages. This control method is based on two most important basic principles. First, a certain structural system, boundary conditions, external loads and stress-free state quantities uniquely determine the internal force and deformation of the structure. As long as the above four conditions remain unchanged, the structural Internal force and deformation have nothing to do with the installation and forming process; second, the stress-free state quantity does not change with the other three conditions, but only changes when it adjusts itself. The stress-free state quantity of the structure is a stable ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E01D21/00E01D11/04
Inventor 杨春张大伟张强崔妙生
Owner SHANGHAI PUDONG ARCHITECTURAL DESIGN & RES INST
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