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Earthquake wave selection and adjustment method used for structural earthquake response analysis

A technology of response analysis and adjustment methods, applied in special data processing applications, instruments, calculations, etc., can solve problems such as difficult and impossible wave selection

Active Publication Date: 2014-12-10
GUANGXI TRANSPORTATION SCI & TECH GRP CO LTD
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Problems solved by technology

In addition, if the natural seismic wave is required to have a high consistency with the target spectrum in each cycle, the wave selection work will be more difficult or even impossible to complete

Method used

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  • Earthquake wave selection and adjustment method used for structural earthquake response analysis
  • Earthquake wave selection and adjustment method used for structural earthquake response analysis
  • Earthquake wave selection and adjustment method used for structural earthquake response analysis

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Embodiment

[0044] A 4-span simply supported and then continuous T-beam bridge is a widely used structural form in bridge engineering, as shown in the attached figure 1 Shown: The bridge adopts a 4×30-meter simply supported and then continuously prestressed concrete T-beam bridge. The bridge width is 12 meters. The single-span bridge is composed of 6 T-beams. The single beam is 2 meters wide and 2 meters high. The single beam has a mass of 85 tons. The lower part of the bridge is framed piers and gravity U-shaped abutments. The abutment part adopts GYZF4450x89 circular PTFE slide rubber bearing, and the pier part adopts high damping rubber bearing.

[0045] The proposed construction site of the bridge is 8 degrees 0.2g, a Class II site, the characteristic period Tg of the response spectrum is 0.45s, and the peak acceleration of the response spectrum is 0.765g according to the specification. The calculated mass participation coefficient of the first-order mode shape of the bridge is 0.90...

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Abstract

The invention discloses an earthquake wave selection and adjustment method used for structural earthquake response analysis. The structural earthquake response analysis comprises the following steps: firstly, according to the spectral pattern characteristics of an earthquake dynamic response spectrum and the user-defined structural dynamic magnification factors, selecting a contrast interval of a beam bridge structure natural vibration period Tn; secondly, selecting a high-band contrast interval of the earthquake dynamic response spectrum; thirdly, respectively calculating the corresponding area ratios KN and KT in the two contrast intervals of a natural wave response spectrum curve and a target spectrum curve; fourthly, selecting qualified natural earthquake waves (0.8<=KT / KN<=1.2); setting a regulation factor to enable the response spectrum areas in the two intervals of natural earthquake waves to be close to the target spectrum area; taking response of a pier as the research target to achieve dynamic plastoelasticity analysis on bridges. Through double-parameter wave selection principle, the difficulty in selecting earthquake waves is greatly lowered, and the reliability of the vibration time interval analysis result of the bridge is guaranteed. Therefore, the earthquake wave selection and adjustment method provided by the invention is practical.

Description

technical field [0001] The invention belongs to the field of seismic design of bridge structures, and in particular relates to a method for selecting and adjusting seismic waves in structural seismic response analysis. Background technique [0002] Bridges are a key part of the "Lifeline Project" and play an extremely important role in emergency rescue and disaster relief after an earthquake, as well as post-disaster recovery and reconstruction. A strong earthquake may cause serious damage and collapse of bridges, disrupt traffic, hinder earthquake relief work, cause greater loss of life and property, and expand the extent of earthquake damage. my country's newly promulgated "Seismic Design Rules for Highway Bridges" (JTG / TB02-01-2008) divides bridges into four categories: A, B, C, and D, and stipulates that E1 is required for all three categories of A, B, and C bridges. The recommended calculation methods for the seismic design under the action of the and E2 earthquakes are...

Claims

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Application Information

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IPC IPC(8): G06F19/00
Inventor 张云周晓蓉谭平马玥
Owner GUANGXI TRANSPORTATION SCI & TECH GRP CO LTD
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