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A Probabilistic Analysis Method of Bridge Earthquake Risk Based on Performance Design

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

Active Publication Date: 2022-05-24
HUATIAN ENG & TECH CORP MCC +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • A Probabilistic Analysis Method of Bridge Earthquake Risk Based on Performance Design
  • A Probabilistic Analysis Method of Bridge Earthquake Risk Based on Performance Design
  • A Probabilistic Analysis Method of Bridge Earthquake Risk Based on Performance Design

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Embodiment 1

[0058] combine figure 1 In this embodiment, a performance-based bridge seismic risk probability analysis method 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 section Analytical method to establish seismic vulnerability function;

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

[0060](3) According to the obtained seismic vulnerability function and seismic risk function, establish the seismic risk probability function within the design base 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 a specific scheme of Embodiment 1, the specific method for establishing the seismic vulnerability function in step (1) in this embodiment is:

[0064] (1.1) Establish the dynamic analysis model of the bridge structure, and obtain the multi-order vibration mode and corresponding natural vibration period of the bridge structure; Figure 5 As shown, the seismic fortification intensity of the bridge is 8 degrees, and the design reference period is 100 years.

[0065] (1.2) Select 10 actual seismic waves according to the bridge site conditions. The first vibration mode of the bridge structure is the same direction vibration of the main tower and main girder along the bridge, and the fourth vibration mode is the symmetrical side bending of the main tower transverse to the bridge, and the spectral acceleration value Sa (T 1 , ζ=3%) and Sa(T 4 , ζ=3%), and divide each seismic wave into a group of seismic waves with gradually increasing intensity. Image 6 The acceleration...

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Abstract

The invention discloses a bridge earthquake risk probability analysis method based on performance design. Including (1) establishing the seismic vulnerability function according to the IDA method and the cross-section analysis method; (2) establishing the seismic hazard function at the bridge site according to the seismic hazard probability analysis method; (3) according to the obtained seismic vulnerability function and seismic risk function, establish the seismic risk probability function in the design reference period; (4) analyze the performance of the bridge according to the seismic risk probability function and the seismic performance design theory. The present invention is an earthquake risk probability analysis method based on performance design, which can judge whether the bridge structure satisfies the performance-based design's seismic performance targets at all levels in a probabilistic form, and can further determine the vulnerable position of the bridge structure under earthquake action. The earthquake damage assessment, maintenance and operation management of bridges have certain guiding significance.

Description

technical field [0001] The invention relates to the technical field of seismic risk analysis and loss assessment, in particular to a performance design-based bridge seismic risk probability analysis method. Background technique [0002] The idea of ​​performance-based seismic design can be summarized as follows: adopt reasonable seismic performance targets and appropriate seismic fortification measures to carry out seismic design of the structure, so that the damage and loss of the structure under different levels of seismic action can be borne by the owner, and through the whole life The periodic cost-benefit analysis makes the structure safe, reliable, economical and reasonable. Although this seismic design concept has been reflected in the latest version of the seismic design codes of 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 a...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/13G06F30/20G06F111/08
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