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Geostatistical approach for statistical description of uplift pressures: Part II

Westberg, Marie LU (2009) In Dam Engineering 20(1).
Abstract
The possibilities of using structural reliability analysis in concrete dam design and assessment is investigated in Sweden. For such analysis statistical descriptions of the loads and resistances are necessary. Uplift pressure has a large impact on the safety and is difficult to quantify. In ‘Geostatistical approach for statistical description of uplift pressures: Part 1’*, the methodology of a geostatistical approach to simulate the uplift pressure was described, while in this paper the results are thoroughly represented.



The uplift force was found possible to describe as it is received from the assumption usually used in design, multiplied by a random parameter, C. Due to physical limitations C varies between 0-2.... (More)
The possibilities of using structural reliability analysis in concrete dam design and assessment is investigated in Sweden. For such analysis statistical descriptions of the loads and resistances are necessary. Uplift pressure has a large impact on the safety and is difficult to quantify. In ‘Geostatistical approach for statistical description of uplift pressures: Part 1’*, the methodology of a geostatistical approach to simulate the uplift pressure was described, while in this paper the results are thoroughly represented.



The uplift force was found possible to describe as it is received from the assumption usually used in design, multiplied by a random parameter, C. Due to physical limitations C varies between 0-2. Similarly, for the moment from uplift pressure, Cm varies between 0-1.5.



Hydraulic conductivity beneath the dam was described as a random field with certain properties. A sensitivity analysis was performed for different variance and range. The results are stable for a range >4m, while the variance is more important. For small variance the pdf of C and Cm are narrow and normal-like, while for large variance they become wide and rectangular- or triangular-shaped, respectively.



The methodology is also tested for dams with drains and grout, buttress dams of different geometry. and for rock with an anisotropic correlation structure.



The conclusion is that the methodology is useful and gives a valuable statistical descriptions of the uplift pressure. This may be used as input when performing structural reliability analysis. For further improvement experimental data and three-dimensional simulation could be used. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Dam Engineering
volume
20
issue
1
publisher
Global Trade Media
ISSN
0958-9341
language
English
LU publication?
yes
id
9de6047c-d923-45b3-a7ff-34d87a979a84 (old id 1566768)
date added to LUP
2010-03-11 13:51:42
date last changed
2016-04-16 02:10:04
@article{9de6047c-d923-45b3-a7ff-34d87a979a84,
  abstract     = {The possibilities of using structural reliability analysis in concrete dam design and assessment is investigated in Sweden. For such analysis statistical descriptions of the loads and resistances are necessary. Uplift pressure has a large impact on the safety and is difficult to quantify. In ‘Geostatistical approach for statistical description of uplift pressures: Part 1’*, the methodology of a geostatistical approach to simulate the uplift pressure was described, while in this paper the results are thoroughly represented.<br/><br>
<br/><br>
The uplift force was found possible to describe as it is received from the assumption usually used in design, multiplied by a random parameter, C. Due to physical limitations C varies between 0-2. Similarly, for the moment from uplift pressure, Cm varies between 0-1.5.<br/><br>
<br/><br>
Hydraulic conductivity beneath the dam was described as a random field with certain properties. A sensitivity analysis was performed for different variance and range. The results are stable for a range &gt;4m, while the variance is more important. For small variance the pdf of C and Cm are narrow and normal-like, while for large variance they become wide and rectangular- or triangular-shaped, respectively.<br/><br>
<br/><br>
The methodology is also tested for dams with drains and grout, buttress dams of different geometry. and for rock with an anisotropic correlation structure.<br/><br>
<br/><br>
The conclusion is that the methodology is useful and gives a valuable statistical descriptions of the uplift pressure. This may be used as input when performing structural reliability analysis. For further improvement experimental data and three-dimensional simulation could be used.},
  author       = {Westberg, Marie},
  issn         = {0958-9341},
  language     = {eng},
  number       = {1},
  publisher    = {Global Trade Media},
  series       = {Dam Engineering},
  title        = {Geostatistical approach for statistical description of uplift pressures: Part II},
  volume       = {20},
  year         = {2009},
}