Oasys SIREN.

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Presentation transcript:

Oasys SIREN

Oasys SIREN = Displacement Output motion Soil Surface Bedrock Input motion

Response spectrum

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

Site Response ? Bedrock

Mexico City ground conditions

Ground conditions

SIREN - input parameters Soil profile Density Small strain shear modulus G0 g G/G with shear strain amplitude Input time history – selected to match target bedrock outcrop response from the seismic hazard assessment

Geophysical methods for G0 G0 = rVS2 Down hole insitu test

Down hole shear wave testing

Interpretation of Down-hole Seismic Survey 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

Variation of G/G0 with shear strain amplitude 1 Gsec PI = 200 100 G0 50 30 15 OCR = 1 - 15 0.0001 0.001 0.01 0.1 1 10 Cyclic shear strain (%)

G0(ij) = rvs(ij)2 where G0(ij) is the elastic shear modulus r is the bulk density of soil and vs(ij) is the shear wave velocity through soil Vs(vh) v Bender element (vs(vh)) Bender element (vs(hv)) Bender element (vs(hh)) Bender element probe Vs(hv) Vs(hh) Bender element Soil triaxial specimen Bender element embedded in base platen Bender element probe Hall-effect gauge (radial) Hall-effect gauge (axial)

Oasys SIREN = Displacement Output motion Soil Surface Bedrock Input motion

Calculated Site response effects Serviceability

Calculated Site response effects Ultimate

Calculated Site response effects Structural Integrity Limit State - SILS

Liquefaction

Liquefaction Philippines 1989

Liquefaction Philippines 1989

Standard method of assessing the likelihood Liquefaction Standard method of assessing the likelihood Percent fines (%) 35 15 <5 0.5 Note: figure applies for a magnitude 7.5 earthquake 0.4 Liquefaction 0.3 Average peak shear stress / vertical effective stress From SIREN 0.2 No Liquefaction 0.1 10 20 30 40 50 Corrected SPT N value (N1)

Predicted likelihood of liquefaction Serviceability Ultimate SILS

Foundation design - Lateral Loads on Piles 500 250 Bending Moment (kNM) 5 10 15 Horizontal displacement (mm) Soil displacement from SIREN Pile displacement Fill Alluvium 100 : 30 combination rule CDG Bedrock

Large Diameter Bored Piles Pile Caps

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

Bending moments induced in piles