Bridge Structure Bearing Non-probabilistic Reliability Study Based On Convex Model

There is uncertainty in engineering structure,which includes randomness,fuzziness and unascertained characteristic.The radom probabilistic reliability method in the bridge bearing capacity evaluation process exhibit essentially inconsistent and unadapted. Therefore, this paper on the existing non probabilistic structural evaluation of bridges is put forward to study the reliability, both the new technology ofnon probabilistic reliability assessment of bridge structure.This paper focuses on the fundamental problem of solving non probabilistic reliability theory involved in bridge construction, the main research contents are as follows:(1)Study on the basic theory of the calculation of non-probabilistic reliability model based on ellipsoid convex:draw the relevant mathematical expressions based on the ellipsoid convex model, analysis of applicable conditions of the model and the advantages and disadvantages.(2) Reliability analysis based on interval arithmetic, including the definition of interval number, interval arithmetic formats, obtaining expressions range studied, as well as a common structural feature attenuation parameters. Then study the specific method for solving structural resistance and load effect on the non-probabilistic bridge reliability index and probability reliability index.(3) Non-probabilistic reliability assessment study architecture, through the study of non-probability based on actual test data dependent reliability assessment theory, can affect many active duty reinforced concrete bridge resistance factors were analyzed and studied under the influence of these factors structural performance degradation mechanisms and mathematical models change over time, can be drawn when the structure becomes resistance values under the combined effect of these factors. Then on active duty steel-concrete bridge load effects were analyzed, and the main research permanent load effects and consider changes in traffic load effect of the mathematical model of the vehicle, and then to carry out specific examples based on actual traffic growth figures and specific load effect model analysis, the effect of the load the vehicle with varying model. Non-probabilistic reliability of the whole life cycle of the obtained curves and traditional reliability described, can draw their own variation, and can find specific links and differences between them. By exploring the relationship between them, can quantify the relationships between them, and then propose the introduction of a non-probabilistic reliability of traditional probabilistic reliability specific formula, and then piled on the existing structures for evaluation.This paper will break the traditional situation that bridge bearing capacity evaluation rely solely on the probabilistic reliability theory, make the structure uncertainty analysis more comprehensive system, conduce to more objectively evaluated on bridge structure.