Bridge seismic risk probability analysis method based on performance design

A technology of risk probability and analysis method, applied in the field of bridge seismic risk probability analysis based on performance design, which can solve the problems of limited applicability of medium and long-term bridge structures

Active Publication Date: 2018-09-28
HUATIAN ENG & TECH CORP MCC +1
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Problems solved by technology

At present, the research on seismic vulnerability mainly selects the ground peak acceleration (PGA) to characterize the earthquake intensity parameters to study the seismic vulnerability of structures. PGA only reflects the ground motion characteristics of earthquakes and has nothing to do with the characteristics of the structure itself. The applicability is limited; the earthquake risk analysis mainly considers the earthquake risk with limited historical earthquake data or direct statistical IDA curves, and the earthquake size adopts a deterministic assessment method, and does not quantitatively describe the time, space and size of the earthquake occurrence with the theory of probability and statistics. Uncertainty in and inhomogeneity of potential source regions

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  • Bridge seismic risk probability analysis method based on performance design
  • Bridge seismic risk probability analysis method based on performance design
  • Bridge seismic risk probability analysis method based on performance design

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Embodiment 1

[0058] to combine figure 1 In this embodiment, a method for probabilistic analysis of bridge seismic risk based on performance design is provided. Specifically, taking the seismic risk analysis of the main tower of a long-span cable-stayed bridge under earthquake action as an example, the specific implementation steps are as follows: (1 ) according to the IDA method and the cross-section Analytical method to establish earthquake vulnerability function;

[0059] (2) According to the seismic hazard probability analysis method, the seismic hazard function at the bridge site is established;

[0060](3) According to the obtained seismic vulnerability function and seismic hazard function, establish the seismic risk probability function within the design reference period;

[0061] (4) According to the seismic risk probability function and the seismic performance design theory, the bridge performance is analyzed.

Embodiment 2

[0063] As the concrete scheme of embodiment 1, the specific method of setting up the seismic fragility function in the step (1) in the present embodiment is:

[0064] (1.1) Establish the dynamic analysis model of the bridge structure, obtain the multi-order mode shapes and corresponding natural vibration periods of the bridge structure; the qualified key section size of the main tower of the bridge structure is as follows: Figure 5 As shown, the fortification intensity of the bridge's seismic measures is 8 degrees, and the design reference period is 100 years.

[0065] (1.2) Select 10 actual seismic waves according to the site conditions of the bridge site. The first vibration mode of the bridge structure is to vibrate in the same direction along the bridge to the main girder of the main tower, and the fourth vibration mode of the main tower is to bend symmetrically to the transverse bridge. The spectral acceleration value Sa(T 1 , ζ=3%) and Sa(T 4 , ζ=3%), and each seismic...

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Abstract

The present invention discloses a bridge seismic risk probability analysis method based on performance design. The method comprises: (1) establishing a seismic vulnerability function according to an IDA method and a section (as shown in the specification) analysis method; (2) according to a seismic risk probability analysis method, establishing a seismic hazard function at the bridge site; (3) establishing a seismic risk probability function in the design reference period according to the obtained seismic vulnerability function and the seismic hazard function; and (4) according to the design theory of the seismic risk probability function and seismic performance, perform performance analysis on the bridge. According to the seismic risk probability analysis method based on performance design provided by the present invention, whether the bridge structure satisfies objectives of each level of seismic performance based on performance design can be determined in a probabilistic manner, thevulnerable damage position of the bridge structure under the seismic action can be further determined, and the method has certain guiding significance to seismic loss assessment and maintenance operation management of bridges.

Description

technical field [0001] The invention relates to the technical field of earthquake risk analysis and loss assessment, in particular to a method for probabilistic analysis of bridge earthquake risk based on performance design. Background technique [0002] The idea of ​​performance-based seismic design can be summarized as follows: using reasonable seismic performance targets and appropriate seismic fortification measures for structural seismic design, so that the damage and loss of the structure under different levels of earthquakes can be borne by the owner, and through the whole life Periodic cost-benefit analysis makes the structure safe, reliable and economically reasonable. Although this seismic design concept has been reflected in the latest versions of seismic design codes in various countries, there are not many real practical engineering applications, and further in-depth research and promotion are needed in combination with engineering practice. [0003] As the lif...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/13G06F2119/06G06F30/20
Inventor 丰丙龙吴艳丽雷鸣苏杰许会杨伟钱守龙禹强
Owner HUATIAN ENG & TECH CORP MCC
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