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Method for determining transverse dynamic displacement of girder of large-span bridge structure

A bridge structure and dynamic displacement technology is applied in the field of determining the lateral dynamic displacement of the main beam of the large-span bridge structure and the load effect of the structural members of the large-span bridge, which can solve the problem of less monitoring and analysis work, and unknown changes in the lateral dynamic displacement of the main beam member. And other issues

Inactive Publication Date: 2014-07-02
SOUTHEAST UNIV
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Problems solved by technology

However, there is little monitoring and analysis work on the lateral dynamic displacement of main girder components at present, and the variation law of the lateral dynamic displacement of main girder components under real environmental conditions is still unknown. The method of transverse dynamic displacement of the main beam under the condition of

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  • Method for determining transverse dynamic displacement of girder of large-span bridge structure
  • Method for determining transverse dynamic displacement of girder of large-span bridge structure
  • Method for determining transverse dynamic displacement of girder of large-span bridge structure

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Embodiment Construction

[0069] The technical solution of the present invention will be described in detail below with reference to the accompanying drawings.

[0070] A method for determining the lateral dynamic displacement of the main girder of a long-span bridge structure of the present invention comprises the following steps:

[0071] Step (1): Collect monitoring data of GPS displacement in the mid-span of the main girder:

[0072] A GPS displacement monitoring station is installed at the middle of the main girder span of the long-span bridge, where the displacement vector u(t) is monitored in real time and stored in time series, u(t)=[u x (t), u y (t), u z (t)], u x (t), u y (t), u z (t) are the three-axis displacement in the GPS coordinate system, t represents time, t=1,2,...,L, the unit is second, and L represents the length of time;

[0073] Step (2): Carry out vector decomposition and mean value processing on the monitoring data to obtain the lateral dynamic displacement data. The spec...

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Abstract

The invention discloses a method for determining transverse dynamic displacement of a girder of a large-span bridge structure. The method includes the following steps that (1), GPS displacement monitoring data in a girder span are collected; (2) vector decomposition and mean value processing are conducted on the monitoring data to obtain transverse dynamic displacement data; (3) fitting is conducted on the power spectral density of the transverse dynamic displacement data by the adoption of the Gaussian series; (4) the harmony superposition method is used for obtaining the dynamic displacement fitted value of the girder. According to the method, a mathematical modeling method is used on the basis of the monitoring data, and transverse dynamic displacement of the girder can be determined more accurately.

Description

technical field [0001] The invention belongs to the field of load effect analysis of structural members of long-span bridges, and relates to a method for determining the load effect of structural members of long-span bridges, in particular to a method for determining the lateral dynamic displacement of main girders of long-span bridge structures. Background technique [0002] The cable-bearing long-span bridge structure system has been widely used in bridge design types. Due to its softness, the main girder members will have obvious lateral displacement response when subjected to a large wind load, which seriously affects the long-span bridge structure during operation. normal use and safety performance. Therefore, it is of great practical significance to study the mid-span lateral dynamic displacement of the main girder under the wind load response of long-span bridge structures. At present, researchers from various countries have conducted a certain degree of research on ...

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Application Information

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IPC IPC(8): G01M9/00
Inventor 王高新丁幼亮谢辉宋永生
Owner SOUTHEAST UNIV
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