Analysis method for translation-torsion coupling wind induced oscillation response of non-coaxial rigidity eccentric structure

A technology of eccentric structure and analysis method, used in special data processing applications, instruments, electrical digital data processing, etc.

Inactive Publication Date: 2012-04-25
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the mass center, stiffness center and geometric center of the actual structure are often not coincident, and the structure will produce a flat-torsional coupled wind-induced response

Method used

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  • Analysis method for translation-torsion coupling wind induced oscillation response of non-coaxial rigidity eccentric structure
  • Analysis method for translation-torsion coupling wind induced oscillation response of non-coaxial rigidity eccentric structure
  • Analysis method for translation-torsion coupling wind induced oscillation response of non-coaxial rigidity eccentric structure

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Embodiment 1

[0033] The method for analyzing the response of the non-coaxial rigid eccentric structure to the coupling wind vibration is characterized in that the operation steps are as follows:

[0034] 1) The stiffness eccentricity of each layer of the structure is expressed in the form of polar coordinates;

[0035] 2) Establish the dynamic equation of the non-coaxial stiffness eccentric structure;

[0036] 3) Select the structural model, determine the model parameters, and use polar coordinates to represent the non-coaxial stiffness eccentricity of the structure;

[0037] 4) Based on the power spectrum of downwind, across-wind and torsional wind loads, considering the correlation between the across-wind and torsional wind loads and the coupling between modes, the wind-induced translation-torsion of non-coaxial mass eccentric structures is performed in the frequency domain Coupled response analysis;

[0038] 5) By setting the structural stiffness eccentricity at different posi...

Embodiment 2

[0040] This embodiment is basically the same as the embodiment, and it is characterized in that the step 1) uses polar coordinates to represent the stiffness eccentricity of each layer of the structure: when the displacement of the geometric center of the structure in the downwind direction is , the crosswind displacement is and the torsional displacement is When , the polar coordinate expressions of the stiffness center in the downwind direction, across the wind direction and torsional displacement are:

[0041] (1)

[0042] (2)

[0043] (3)

[0044] In the formula, is the radial coordinate of the stiffness center, is the angular coordinate of the stiffness center.

Embodiment 3

[0046] see figure 1 and figure 2 , the analysis method steps of the non-coaxial stiffness eccentric structure coupled torsion wind vibration response are as follows:

[0047] In the first step, polar coordinates are used to represent the eccentric position of the structural stiffness.

[0048] In the second part, the dynamic equation of the non-coaxial stiffness eccentric structure is established, and the equation is shown in formula (5).

[0049] In the third step, the selected structure is a building whose plane size is ,high For a rectangular steel structure building, the damping ratio is assumed to be 1%, the average wind speed at 10m is selected as 15m / s, and the statistical correlation between the cross wind direction and the torsional wind load is 0.7. Other structural model parameters are shown in the table below:

[0050]

[0051] The fourth step, based on the power spectrum of the downwind, across-wind and torsional wind loads, considering the correlation b...

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Abstract

The invention discloses an analysis method for translation-torsion coupling wind induced oscillation response of a non-coaxial rigidity eccentric structure. The method is operated through the following steps of: 1, representing rigidity eccentricity of each layer of the structure in the form of polar coordinate; 2, constructing a power equation of the non-coaxial rigidity eccentric structure; 3, selecting a structural model and determining a model parameter; 4, performing wind induced translation-torsion coupling response analysis on the non-coaxial quality eccentric structure in a frequency domain; and 5, calculating an arithmetic root mean square matrix of displacement and acceleration of the structure, and analyzing data to obtain main influence of mono-axial rigidity eccentricity and non-coaxial rigidity eccentricity on the translation-torsion wind induced oscillation of a rectangular building structure. By using the analysis method, the translation-torsion coupling wind induced oscillation response of the rigidity eccentric structure is analyzed in the frequency domain to obtain the arithmetic root mean square data of the central displacement and acceleration of the plane of each layer of the structure; the method has the innovation point that: the non-coaxial eccentricity of the structure is represented by using the polar coordinate; and the method has the advantages that: the eccentric position of the structure can be flexibly set; and the influence rule of the non-coaxial (any) eccentricity on the wind induced oscillation response of the structure can be given.

Description

technical field [0001] The invention relates to a method for analyzing the wind vibration response of a building engineering structure, in particular to a method for analyzing the wind vibration response of a non-coaxial stiffness eccentric structure coupled with flat torsion. Background technique [0002] With the development of the economy, the degree of urbanization is increasing day by day, the urban population is increasing rapidly, the contradiction between the continuous expansion of people's activity space and the non-renewable resources such as land is becoming more and more prominent. In order to expand one's own living space, various new technologies, new materials, new styles, and new design methods have emerged as the times require, and civil engineering has become increasingly diverse, complex, and large-scale, which has caused the mass center and stiffness center of the building structure to not coincide. , the wind load acting on the center of mass of th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F19/00
Inventor 李春祥于安琪
Owner SHANGHAI UNIV
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