Probabilistic Assessment of Weld Quality in Steel Piping Under Seismic Conditions

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Seismic stress analyses of plant piping systems usually ignore the possibility of reduced joint strength due to weld imperfections. This paper presents a method that might be used to assess the impact of weld imperfections in a piping system, provided that limited destructive examination of welded joints is possible. A probability distribution function of weld quality is developed from the destructive examination, and this is combined with an experimentally determined relationship between weld quality and reduced strength. This latter is the result of uniaxial tensile testing of specimens with controlled imperfections. A seismic stress probability distribution function is determined by ... continued below

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Awadalla, N.G. May 29, 2001.

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Seismic stress analyses of plant piping systems usually ignore the possibility of reduced joint strength due to weld imperfections. This paper presents a method that might be used to assess the impact of weld imperfections in a piping system, provided that limited destructive examination of welded joints is possible. A probability distribution function of weld quality is developed from the destructive examination, and this is combined with an experimentally determined relationship between weld quality and reduced strength. This latter is the result of uniaxial tensile testing of specimens with controlled imperfections. A seismic stress probability distribution function is determined by conventional seismic analysis. The above quantities are used to quantify the conditional failure probability of the imperfect weld. Effect of imperfection distribution within a given weld on the probability of failure is discussed.

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  • Journal Name: International Journal of Pressure Vessels and Piping

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  • Report No.: DP-MS-83-16 Pub. 2
  • Grant Number: AC09-76SR00001
  • Office of Scientific & Technical Information Report Number: 781490
  • Archival Resource Key: ark:/67531/metadc715070

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  • May 29, 2001

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  • Sept. 29, 2015, 5:31 a.m.

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  • May 5, 2016, 2:29 p.m.

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Awadalla, N.G. Probabilistic Assessment of Weld Quality in Steel Piping Under Seismic Conditions, article, May 29, 2001; South Carolina. (digital.library.unt.edu/ark:/67531/metadc715070/: accessed August 22, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.