Download presentation

Presentation is loading. Please wait.

Published byImani Brumby Modified over 2 years ago

1
Oasys SIREN

2
Bedrock Soil Surface Output motion F = F Input motion Displacement

3
Response spectrum

4
The use of SIREN in the Seismic Design of Stonecutters Bridge Jack Pappin Site Response Liquefaction Foundation Design

5
Bedrock ? Site Response

6
Mexico City ground conditions

7

8
Ground conditions

9
SIREN - input parameters Soil profile Density Small strain shear modulus G 0 g G/G with shear strain amplitude Input time history – selected to match target bedrock outcrop response from the seismic hazard assessment

10
Geophysical methods for G 0 Down hole insitu test G 0 = V S 2

11
Down hole shear wave testing

12
Time Signals received by orthogonal sensors Shear wave arrival through the ground Reverse polarity signals generated by hitting beam from opposite directions P waves or S waves travelling through casing or grout column Interpretation of Down-hole Seismic Survey

13

14
G sec G0G Cyclic shear strain (%) PI = 200 OCR = Variation of G/G0 with shear strain amplitude

15
G 0(ij) = v s(ij) 2 where G 0(ij) is the elastic shear modulus is the bulk density of soil and v s(ij) is the shear wave velocity through soil V s(vh) V s(hh) V s(hv) v Soil triaxial specimen Bender element Bender element (v s(vh) ) Bender element embedded in base platen Bender element (v s(hv) ) Bender element (v s(hh) ) Bender element probe Hall-effect gauge (radial) Hall-effect gauge (axial)

16
Bedrock Soil Surface Output motion F = F Input motion Displacement Oasys SIREN

17
Calculated Site response effects Serviceability

18
Calculated Site response effects Ultimate

19
Calculated Site response effects Structural Integrity Limit State - SILS

20
Liquefaction

21
Philippines 1989 Liquefaction

22
Philippines 1989 Liquefaction

23
Standard method of assessing the likelihood Corrected SPT N value (N 1 ) Average peak shear stress / vertical effective stress Percent fines (%) <5 No Liquefaction Liquefaction 0 Note: figure applies for a magnitude 7.5 earthquake From SIREN Liquefaction

24
Predicted likelihood of liquefaction Serviceability SILS Ultimate

25
Bedrock CDG Alluvium Fill Bending Moment (kNM) Horizontal displacement (mm) Soil displacement from SIREN Pile displacement 100 : 30 combination rule Foundation design - Lateral Loads on Piles

26
Large Diameter Bored Piles Pile Caps

27
Pile group modelling Soil Profile Piles Interface elements Free field soil lateral displacement Acceleration

28
Bending moments induced in piles

Similar presentations

© 2017 SlidePlayer.com Inc.

All rights reserved.

Ads by Google