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Safety coefficient design method capable of evaluating non-probability reliability of structure

A technology of safety factor and design method, which is applied in the field of safety factor design that can evaluate the non-probabilistic reliability of structures, can solve problems such as the complexity and incomprehensibility of reliability design methods, and achieve easy understanding and acceptance, convenient calculation, and engineering applicability strong effect

Active Publication Date: 2016-08-10
BEIHANG UNIV
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Problems solved by technology

[0005] The technical problem solved by the present invention is: to overcome the subjective blindness of the traditional safety factor method and the complexity and incomprehensibility of the reliability design method, combine the simplicity and convenience of the safety factor method with the effective and reasonable reliability design method, and aim at engineering practice Characterize the finite sample data of uncertain parameters, and provide a safety factor design method that can evaluate the non-probabilistic reliability of structures

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  • Safety coefficient design method capable of evaluating non-probability reliability of structure
  • Safety coefficient design method capable of evaluating non-probability reliability of structure
  • Safety coefficient design method capable of evaluating non-probability reliability of structure

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[0110] In order to understand more fully the characteristics of the invention and its applicability to engineering practice, the present invention aims at such as Figure 4 The shown rectangular cross-section cantilever beam structure with uncertain structural loads, material properties and other parameters is designed based on the non-probabilistic reliability factor of safety. The cantilever beam structure at position b 1 = 2.0m and b 2 =5.0m places respectively bear the concentrated load P 1 and P 2 effect. where the external load P 1 and P 2 is an uncertain variable whose distribution characteristics are determined by a series of experimental data points in the table. The ultimate strength of the cantilever beam is an uncertain interval variable, and the distribution interval is R∈[380-β×380,380+β×380], where β=0.06. According to the knowledge of material mechanics, the limit state equation of the cantilever beam is:

[0111] M = R...

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Abstract

The invention discloses a safety coefficient design method capable of evaluating non-probability reliability of a structure. Firstly, non-probability characteristics of uncertain parameters are reasonably represented with a non-statistical measurement method by the aid of finite sample data of structure parameters; uncertain distribution characteristics of structural stress and strength are determined through approximation solution, Monte Carlo simulation method and the like; a stress-strength non-probability set interference model of the structure is established, and a corresponding non-probability set theory reliability evaluation formula is proposed; an analytical expression of safety coefficients related to the non-probability set theory reliability, strength variation coefficient, stress variation coefficient and the like is established in combination with the non-probability set theory reliability evaluation formula; according to the engineering structure, corresponding safety coefficients are calculated according to corresponding reliability requirements, safety coefficient structure design is conducted, and the optimal structure design scheme meeting certain reliability is obtained. The method considers safety and economy of the design and reserves characteristics that traditional safety coefficient design methods are simple in concept and easy to implement.

Description

technical field [0001] The present invention relates to the optimal design technology of structures with non-probabilistic uncertain parameters, in particular to the quantitative characterization of the central safety factor based on the combination of non-probability set theory reliability, uncertain stress variation coefficient, strength variation coefficient and central safety factor. Structural safety factor design of probabilistic reliability, in order to obtain the optimal design scheme of structure satisfying certain reliability. Background technique [0002] In terms of structural design, the traditional safety factor design method is widely used in the engineering field because of its simple concept and convenient use. On the other hand, the reliability design method enables the structure to have a more rational design because it can ensure that the structure meets specific reliability requirements. However, both of these methods suffer from a certain degree of ina...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/17
Inventor 邱志平陈潇王晓军王磊孙佳丽
Owner BEIHANG UNIV
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