Difference between revisions of "Gpec8"

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(New page: This tutorial details all the steps needed to determine the EC8 class of a site from the input of the velocity profile The input is the soil column (in a format similar to gpsh [[geopsy:...)
 
 
(29 intermediate revisions by 2 users not shown)
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This tutorial details all the steps needed to determine the EC8 class of a site from the input of the velocity profile
+
== Synopsis ==
  
−
The input is the soil column (in a format similar to gpsh [[geopsy:gpsh]]
+
gpec8 [OPTIONS] [FILE]
−
The output is the EC8 site class depending on the value of time-averaged velocity over the top 30 m ("VS30")
+
 +
== Description ==
  
−
gpec8 -help
+
Determines the EC8 category of a site for horizontally layered models given through stdin or FILE. 
−
Usage: gpec8 [OPTIONS] [FILE]
+
 
−
Print EC8 site class corresponding to intput models
+
The input is the soil column (in a format similar to [[Gpdc]], [[Gpell]], [[Gpspac]] or [[Gpsh]].
 +
The output is the EC8 site category depending mainly on the value of the time-averaged velocity over the top 30 m ("VS30"), and also on the thickness of the softest layers (categories E and S1)
 +
 
 +
== EC8 site categories ==
 +
*'''Category A :'''  Rock, ''800 m/s < VS30'' and ''"including at most 5 m of weaker material at the surface"''. The latter condition is interpreted here as : ''VS05 > 360 m/s'', where VS05 is the average velocity over the top 5 m.
 +
 
 +
4
 +
5. 1200. 600. 2300.
 +
10. 1800. 900. 2500.
 +
10. 2400. 1200. 2600.
 +
0. 3000. 1500. 2500.
 +
8
 +
2. 800. 300. 2000.
 +
2.5 1200. 500. 2100.
 +
3. 1500. 700. 2200.
 +
3.5 1800. 900. 2300.
 +
4. 2000. 1000. 2400.
 +
5. 2200. 1100. 2500.
 +
6. 2400. 1200. 2500.
 +
 
 +
*'''Category B :'''  Stiff soil / soft rock,  ''360 m/s < VS30  < 800 m/s''
 +
 
 +
0. 2500. 1200. 2500.
 +
# Model 3, class B
 +
3
 +
5. 1000. 400. 2000.
 +
20. 1600. 400. 2100.
 +
0. 2200. 1000. 2500.
 +
# Model 4, class B
 +
8
 +
2. 750. 300. 2000.
 +
3. 1250. 500. 2100.
 +
4. 1500. 600. 2200.
 +
5. 1750. 700. 2300.
 +
6. 2000. 800. 2400.
 +
5. 2200. 1000. 2500.
 +
6. 2400. 1200. 2500.
 +
0. 2500. 1250. 2500.
 +
# Model 5, class C
 +
5
 +
3. 500. 150. 1600. 30. 15.
 +
5. 1500. 150. 1600. 50. 15.
 +
10. 1600. 300. 1800. 50. 30.
 +
20. 2000. 500. 2000. 100. 50.
 +
0. 2500. 1000. 2500. 200. 100.
 +
# Model 6, class D
 +
5
 +
5. 400. 110. 1500.
 +
10. 1500. 120. 1600.
 +
10. 1600. 150. 1650.
 +
10. 1700. 200. 1700.
 +
0. 2000. 300. 1900.
 +
# Model 7, class E
 +
5
 +
5. 400. 150. 1600.
 +
10. 1500. 250. 1700.
 +
10. 2000. 800. 2100.
 +
10. 2200. 1000. 2300.
 +
0. 2500. 1200. 2500.
 +
# Model 8, class S1
 +
3
 +
40. 1500. 80. 1500.
 +
500. 2000. 600. 2000.
 +
0. 4000. 2000. 2500.
 +
# Model 9, class S1
 +
5
 +
3. 600. 250. 1800.
 +
15. 1500. 80. 1600.
 +
10. 1600. 500. 2000.
 +
20. 2000. 800. 2200.
 +
0. 2200. 1000. 2500.
 +
 
 +
*'''Category C :'''  Normal soil ''180 m/s < VS30  < 360 m/s''
 +
 
 +
*'''Category D :''' Soft soil, ''100 m/s < VS30  < 180 m/s'' >
 +
 
 +
*'''Category E :''' Thin soft soil with ''100 m/s < VS  < 360 m/s''  and a thickness between ''5 and 20 m'' , overlying a much stiffer unit with ''VS > 800 m/s'' 
 +
 
 +
*'''Category S1 :''' Special category 1 : very soft soil ''(VS30  < 100 m/s)'', or containing at least 10 m of soft clays/silts with high plasticity index ''(interpretation considered here : VS lower than 100 m/s over a thickness larger than 10 m, '''labeled as "S1?"''')''
 +
 
 +
*'''Category S2''' : Special category 2 : liquefiable soils, or all those not covered by A-E and S1 category: ''!! Cannot be identified from the sole VS velocity profile!!''
 +
 
 +
==Format for layered models==
  
−
Format for layered models:
 
 
   Line 1  : <number of layers n including half-space for first model>
 
   Line 1  : <number of layers n including half-space for first model>
 
   Line 2  : <thickness (m)> <Vp (m/s)> <Vs (m/s)> <Density (kg/m3)>[ <Qp> <Qs>]
 
   Line 2  : <thickness (m)> <Vp (m/s)> <Vs (m/s)> <Density (kg/m3)>[ <Qp> <Qs>]
Line 21: Line 103:
  
 
Quality factors are not mandatory. Any number of models can be given as input.
 
Quality factors are not mandatory. Any number of models can be given as input.
 +
 +
== Examples ==
 +
 +
gpec8 [[Media:Gpec8e.model|Gpec8.model]]
 +
 +
Determines the EC8 site category for the soil columns in "ec8.model"
 +
 +
*''' Output '''
 +
Vs30 964.286 Class A
 +
Vs30 816.992 Class A
 +
Vs30 444.444 Class B
 +
Vs30 695.364 Class B
 +
Vs30 271.084 Class C
 +
Vs30 136.082 Class D
 +
Vs30 330.275 Class E
 +
Vs30 80 Class S1
 +
Vs30 135.135 Class S1?

Latest revision as of 16:29, 9 March 2010

Synopsis

gpec8 [OPTIONS] [FILE]

Description

Determines the EC8 category of a site for horizontally layered models given through stdin or FILE.

The input is the soil column (in a format similar to Gpdc, Gpell, Gpspac or Gpsh. The output is the EC8 site category depending mainly on the value of the time-averaged velocity over the top 30 m ("VS30"), and also on the thickness of the softest layers (categories E and S1)

EC8 site categories

  • Category A : Rock, 800 m/s < VS30 and "including at most 5 m of weaker material at the surface". The latter condition is interpreted here as : VS05 > 360 m/s, where VS05 is the average velocity over the top 5 m.
4
5. 1200. 600. 2300.
10. 1800. 900. 2500.
10. 2400. 1200. 2600.
0. 3000. 1500. 2500.
8
2. 800. 300. 2000.
2.5 1200. 500. 2100.
3. 1500. 700. 2200.
3.5 1800. 900. 2300.
4. 2000. 1000. 2400.
5. 2200. 1100. 2500.
6. 2400. 1200. 2500.
  • Category B : Stiff soil / soft rock, 360 m/s < VS30 < 800 m/s
0. 2500. 1200. 2500.
# Model 3, class B
3
5. 1000. 400. 2000.
20. 1600. 400. 2100.
0. 2200. 1000. 2500.
# Model 4, class B
8
2. 750. 300. 2000.
3. 1250. 500. 2100.
4. 1500. 600. 2200.
5. 1750. 700. 2300.
6. 2000. 800. 2400.
5. 2200. 1000. 2500.
6. 2400. 1200. 2500.
0. 2500. 1250. 2500.
# Model 5, class C
5
3. 500. 150. 1600. 30. 15.
5. 1500. 150. 1600. 50. 15.
10. 1600. 300. 1800. 50. 30. 
20. 2000. 500. 2000. 100. 50.
0. 2500. 1000. 2500. 200. 100.
# Model 6, class D
5
5. 400. 110. 1500.
10. 1500. 120. 1600.
10. 1600. 150. 1650.
10. 1700. 200. 1700.
0. 2000. 300. 1900.
# Model 7, class E
5
5. 400. 150. 1600.
10. 1500. 250. 1700.
10. 2000. 800. 2100.
10. 2200. 1000. 2300.
0. 2500. 1200. 2500.
# Model 8, class S1
3
40. 1500. 80. 1500.
500. 2000. 600. 2000.
0. 4000. 2000. 2500.
# Model 9, class S1
5
3. 600. 250. 1800.
15. 1500. 80. 1600.
10. 1600. 500. 2000.
20. 2000. 800. 2200.
0. 2200. 1000. 2500.
  • Category C : Normal soil 180 m/s < VS30 < 360 m/s
  • Category D : Soft soil, 100 m/s < VS30 < 180 m/s >
  • Category E : Thin soft soil with 100 m/s < VS < 360 m/s and a thickness between 5 and 20 m , overlying a much stiffer unit with VS > 800 m/s
  • Category S1 : Special category 1 : very soft soil (VS30 < 100 m/s), or containing at least 10 m of soft clays/silts with high plasticity index (interpretation considered here : VS lower than 100 m/s over a thickness larger than 10 m, labeled as "S1?")
  • Category S2 : Special category 2 : liquefiable soils, or all those not covered by A-E and S1 category: !! Cannot be identified from the sole VS velocity profile!!

Format for layered models

 Line 1  : <number of layers n including half-space for first model>
 Line 2  : <thickness (m)> <Vp (m/s)> <Vs (m/s)> <Density (kg/m3)>[ <Qp> <Qs>]
 ....
 Line n+1 : 0 <Vp (m/s)> <Vs (m/s)> <Density (kg/m3)>[ <Qp> <Qs>]
 Line n+2 : <number of layers m including half-space for a second model - if wished>
 Line n+3 : <thickness (m)> <Vp (m/s)> <Vs (m/s)> <Density (kg/m3)>[ <Qp> <Qs>]
 ....
 Line n+m+2 : 0 <Vp (m/s)> <Vs (m/s)> <Density (kg/m3)>[ <Qp> <Qs>]
 Line n+m+3 : <number of layers l including half-space for a third model - if wished>
 ....

Quality factors are not mandatory. Any number of models can be given as input.

Examples

gpec8 Gpec8.model

Determines the EC8 site category for the soil columns in "ec8.model"

  • Output 
Vs30 964.286 Class A
Vs30 816.992 Class A
Vs30 444.444 Class B
Vs30 695.364 Class B
Vs30 271.084 Class C
Vs30 136.082 Class D
Vs30 330.275 Class E
Vs30 80 Class S1
Vs30 135.135 Class S1?
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