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Analytic method of irregular building seismic response considering SSI (soil-structure interaction) general plane

An analysis method and irregular technology, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve problems such as stiffness centers and geometric centers do not coincide

Inactive Publication Date: 2012-09-12
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the center of mass, center of stiffness and geometric center of the actual structure are often not coincident, and the structure will produce a ground vibration response coupled with torsion

Method used

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  • Analytic method of irregular building seismic response considering SSI (soil-structure interaction) general plane
  • Analytic method of irregular building seismic response considering SSI (soil-structure interaction) general plane
  • Analytic method of irregular building seismic response considering SSI (soil-structure interaction) general plane

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Embodiment 1

[0048] This analysis method considering SSI general plane irregular building seismic response is characterized by the following steps:

[0049] 1) Use polar coordinates to represent the mass eccentricity of each layer of the structure, and establish the dynamic equation of the mass eccentric structure under the action of two-way earthquakes;

[0050] 2) In the frequency domain, the five-degree-of-freedom impedance function is used to characterize the interaction between soil and structure (SSI), and the total motion equation of a general mass eccentric structure considering the SSI effect under bidirectional seismic action is established;

[0051] 3) Select the structure model, determine the model parameters of the soil and structure, characterize the SSI with the impedance function of five degrees of freedom, establish the dynamic equation of the superstructure simultaneously, and establish the total motion equation;

[0052] 4) Based on the power spectrum under the horizontal...

Embodiment 2

[0055] This embodiment is basically the same as the first embodiment, and is characterized in steps 1) and 2).

[0056] 1. The method of expressing the mass eccentricity of each layer of the structure in the form of polar coordinates is: when the displacement of the geometric center of the structure in the X direction is , Y direction displacement is And the torsional displacement is When, the polar coordinate expressions of the center of mass X direction, Y direction and torsion displacement are:

[0057] (1)

[0058] (2)

[0059] (3)

[0060] Where Is the radius coordinate of the center of mass, Is the angular coordinate of the center of mass.

[0061] 2. In the frequency domain, the impedance function of five degrees of freedom is used to characterize the interaction between soil and structure (SSI), and the total motion equation of general mass eccentric structure co...

Embodiment 3

[0070] See figure 1 , figure 2 with image 3 The steps of the analysis method considering the seismic response of SSI general irregular buildings are as follows:

[0071] In the first step, polar coordinates are used to indicate the eccentric position of the structural mass, and the dynamic equation of the general mass eccentric structure under the action of two-way earthquakes is established. The equation is shown in equation (5).

[0072] In the second part, the five-degree-of-freedom impedance function is used to characterize the interaction between soil and structure (SSI), and the total motion equation of a general mass eccentric structure considering the SSI effect under two-way seismic action is established. The equation is shown in equation (9).

[0073] In the third step, take a two-story frame structure as an example, and the structure parameters are shown in the following table. The length and width of the upper structure are both 18m, and the length and width of the bott...

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Abstract

The invention discloses an analytic method of irregular building seismic response considering an SSI (soil-structure interaction) general plane, comprising the operating steps of: firstly, representing mass eccentricity of each layer of a structure by using a polar coordinate and constructing a mass eccentricity structure dynamic equation under a bi-directional seismic action; secondly, representing SSI with five-DOF (degree of freedom) impedance function; thirdly, selecting a structural model, determining model parameters of soil and structure and constructing a general dynamic equation considering SSI general mass eccentricity structure; and fourthly, performing translation-torsion coupling response analysis to the general mass eccentricity structure in a frequency domain based on unitization of an intensity factor of an earthquake spectra. According to the method, influences of coaxial mass eccentricity and non-coaxial mass eccentricity to translation-torsion response of the structure in the case of general mass eccentricity are respectively analyzed, and an arithmetic mean square root of plane central displacement and acceleration of each layer of the structure is calculated and obtained. The method is characterized in that the polar coordinate is employed to represent the non-coaxial eccentricity of the structure. The method has the advantages that the eccentric position of the structure can be flexibly set; and the influence of the non-coaxial eccentricity to the seismic response of the structure is given.

Description

Technical field [0001] The invention relates to a method for analyzing the seismic response of a building engineering structure, in particular to an analysis method for considering the soil-structure interaction (SSI) of a general plane irregular building seismic response. Background technique [0002] With the development of social economy and the increase of urbanization, the urban population has increased sharply. To meet the needs of social development, mankind began to develop underground and in the air. While building develops into the air, it presents a unique and complex shape in front of the world. In order to reflect the imagination of their designs as much as possible, and to reflect the characteristics and individuality of the buildings, the designers have made continuous and rapid development of various strange-shaped buildings and structures. As a result, the center of mass and the center of rigidity of the building structure do not coincide. The wind load act...

Claims

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Application Information

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IPC IPC(8): G06F19/00
Inventor 李春祥甘志兴
Owner SHANGHAI UNIV
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