Probabilistic Methods in Structural Engineering

Augusti, Giuliano; Baratta, Alessandro; Casiati, F.; Saunders, H.

doi:10.1115/1.3269291

Cited by 35 publications

(44 citation statements)

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“…O estudo estatístico inicia-se com a construção do histograma de freqüência das forças de resistência de remoção dos rolamentos (Augusti et al, 1984). Este histograma indica como a distribuição de dados se apresenta por intervalos de classe.…”

Section: Distribuições De Probabilidadeunclassified

Avaliação Da Integridade Estrutural Do Cravamento Em Colunas De Direção

Francisco¹,

Bastos²

2010

Engevista

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Resumo: Diversas partes das colunas de direção de automóveis são fixadas por interferência de diâmetros e, adicionalmente, por ação de cravamento mecânico. Para determinar o efeito destes procedimentos na fixação dos rolamentos nas juntas de colunas de direção foram realizados ensaios de remoção dos rolamentos. Foram testadas populações amostrais das juntas com e sem cravamento. A influência dos procedimentos de cravamento e da interferência dimensional na integridade das colunas de direção foi determinada experimentalmente com curvas força versus deslocamento. Os resultados indicaram que o cravamento mais que dobra a força de remoção e aumenta em 24% a energia absorvida na remoção total. Testes estatísticos de aderência mostraram que a força de remoção obedece a uma distribuição log-normal. A partir destes dados pôde-se determinar a confiabilidade estrutural das juntas de colunas de direção, cujo resultado indica que com o cravamento a taxa esperada de falha é próxima de zero para uma carga mínima de 2000 N. Este trabalho permitiu conhecer a importância do cravamento no procedimento de sujeição de juntas automotivas, e estabelecer novos padrões na montagem das colunas de direção, usando argumentos mecânicos e estatísticos. Palavras-chave: integridade estrutural, colunas de direção.Abstract: Several parts of automotive steering columns are fixed by both dimensional interference and mechanical-plastic sticking of one part to another. To determine the effect of these fixing procedures on the joints of steering columns, pull-out tests were performed. Samples with and without sticking were tested. The influence of the sticking and interference procedures on the integrity of the steering columns was experimentally determined by force-distance curves. The results suggested that the sticking increases more than twice the pull-out force and augments about 24% the absorbed energy in the whole pull-out process. Statistical fitting tests show that pull-out forces obey a lognormal distribution. From these data were possible to estimate the structural reliability of joints of steering columns, which results indicate that the fail probability is close to zero for a minimum pull-out force of 2000 N. This work allows for knowing the importance of the sticking procedure in the fixation of automotive pieces, and establishing new standards for the assembly of steering columns in mechanical and statistical basis.

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Section: Distribuições De Probabilidadeunclassified

Avaliação Da Integridade Estrutural Do Cravamento Em Colunas De Direção

Francisco¹,

Bastos²

2010

Engevista

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“…[1] It is known that accidents at civil buildings depend on human errors in 80% of all accidents [2,3] . The source of faults is an insufficient level of knowledge, lack of experience, inaccurate documents, violation of process discipline and negligence [4,5,6] .…”

Section: Introductionmentioning

confidence: 99%

Safety and Durability Analysis of Structural Works in Civil Engineering

Zhang¹,

Li²,

He³

2016

Advances in Computer Science Research

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Abstract-Based on the study of bitter and tremendous costs paid in managing and maintaining structure works in Civil engineering ，factors that influence the safety and durability of Civil engineering and that cause the Civil engineering accidents are analyzed. In this paper, three indispensable measures to improve the safety and durability of structure works in Civil engineering are suggested: firstly, Reasonable setting the safety level of civil engineering design. The basis of the reasonable set of civil Safety level of structural engineering design, which can effectively avoid the risk of engineering. secondly, Pay attention to the safety and durability of civil engineering structures. We need to pay attention to the safety and durability of civil engineering structures, and strengthen the regular support Nursing management. The third , Improve the safety and durability of civil engineering design standards .According to the concrete conditions of the project, the durability of civil engineering structure is reasonably designed, clear the engineering design and the use of life, to protect the safety and durability of civil engineering structure better.

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“…The calculation of the failure probability of the system was performed by Monte-Carlo sampling methods [27,28]. In the calculation, is constant and obtained by the production of the 20% standard deviation of respective observed samples.…”

Section: Known Performance Functionmentioning

confidence: 99%

“…can be obtained by using either numeric methods (e.g., Monte-Carlo sampling methods [27,28]) or analytic methods.…”

Section: Simple Introduction To Reliability Theorymentioning

confidence: 99%

Performance Assessment of Hydrological Models Considering Acceptable Forecast Error Threshold

Dong

Lü

2015

Water

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Abstract:It is essential to consider the acceptable threshold in the assessment of a hydrological model because of the scarcity of research in the hydrology community and errors do not necessarily cause risk. Two forecast errors, including rainfall forecast error and peak flood forecast error, have been studied based on the reliability theory. The first order second moment (FOSM) and bound methods are used to identify the reliability. Through the case study of the Dahuofang (DHF) Reservoir, it is shown that the correlation between these two errors has great influence on the reliability index of hydrological model. In particular, the reliability index of the DHF hydrological model decreases with the increasing correlation. Based on the reliability theory, the proposed performance evaluation framework incorporating the acceptable forecast error threshold and correlation among the multiple errors can be used to evaluate the performance of a hydrological model and to quantify the uncertainties of a hydrological model output.

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Probabilistic Methods in Structural Engineering

Cited by 35 publications

References 0 publications

Avaliação Da Integridade Estrutural Do Cravamento Em Colunas De Direção

Avaliação Da Integridade Estrutural Do Cravamento Em Colunas De Direção

Safety and Durability Analysis of Structural Works in Civil Engineering

Performance Assessment of Hydrological Models Considering Acceptable Forecast Error Threshold

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