Concrete 2001 Perth September 2001 Barcoo Outlet Culvert The Influence of Soil-Structure Interaction on the Design of a Buried Arch Structure Doug Jenkins.

Concrete 2001Concrete 2001Perth September 2001Perth September 2001

Barcoo Outlet Culvert The Influence of Soil-Structure Interaction on the Design of a Buried Arch Structure

Doug Jenkins

Interactive Design Services

Focus:Focus:

Interaction of soil with deep raft foundations

Analysis methods for foundation design Longitudinal effects on segmental culverts

Culvert DesignCulvert Design

Culvert DesignCulvert Design

Cross-Section AnalysisCross-Section Analysis

-4 -3 -2 -1 0 1 2 3 4

-2

0

2

4

6

-4 -3 -2 -1 0 1 2 3 4

-2

0

2

4

6

-4 -3 -2 -1 0 1 2 3 4

-2

0

2

4

6

-4 -3 -2 -1 0 1 2 3 4

-2

0

2

4

6

-4 -3 -2 -1 0 1 2 3 4

-2

0

2

4

6

-4 -3 -2 -1 0 1 2 3 4

-2

0

2

4

6

-4 -3 -2 -1 0 1 2 3 4

-2

0

2

4

6

-4 -3 -2 -1 0 1 2 3 4

-2

0

2

4

6

-4 -3 -2 -1 0 1 2 3 4

-2

0

2

4

6

-4 -3 -2 -1 0 1 2 3 4

-2

0

2

4

6

-4 -3 -2 -1 0 1 2 3 4

-2

0

2

4

6

-4 -3 -2 -1 0 1 2 3 4

-2

0

2

4

6

-4 -3 -2 -1 0 1 2 3 4

-2

0

2

4

6

-4 -3 -2 -1 0 1 2 3 4

-2

0

2

4

6

Raft Bending MomentsRaft Bending Moments

-4 -3 -2 -1 0 1 2 3 4

Position

-300

-200

-100

0

100

200

300

400

500

Ben

ding

Mom

ent,

kN

m/m

Flat Tapered

Raft Slab Moments

Raft Bending MomentsRaft Bending MomentsEffect of Soil StiffnessEffect of Soil Stiffness

-4 -3 -2 -1 0 1 2 3 4

Position

-300

-200

-100

0

100

200

300

400

500

Ben

ding

Mom

ent,

kN

m/m

100 MPa 30 MPa 10 MPa 10-50 MPa

Raft Slab Moments

Raft Bending MomentsRaft Bending MomentsFinite Element vs Beam on Elastic FoundationsFinite Element vs Beam on Elastic Foundations

-1 0 1 2 3 4 5 6 7 8

Position, m

-400

-300

-200

-100

0

100

200

300

400

Ben

ding

Mom

ent,

kN

m/m

FEA

BoEF

Bending Moments, 20m High Fill

Raft Bending MomentsRaft Bending MomentsBending Moment vs Fill HeightBending Moment vs Fill Height

5 10 15 20 25

Fill Height, m

0

100

200

300

400

500

600

700

Ben

ding

Mom

ent,

kNm

TaperedFlat

Maximum Bending Moment

Raft Bending MomentsRaft Bending MomentsModulus of Subgrade Reaction vs Fill HeightModulus of Subgrade Reaction vs Fill Height

5 10 15 20 25

Fill Height, m

0

10

20

30

40

50

Tho

usan

dsM

odul

us o

f Sub

grad

e R

eact

ion,

kN

/m3

TaperedFlat

Modulus of Subgrade Reaction

Longitudinal EffectsLongitudinal Effects3D Analysis3D Analysis

ConclusionsConclusions

Advantages of finite element analysis:– Soil properties based on standard tests– Model complex foundations– Model complete structure– Model construction sequence

Beam on elastic foundations– Simple and quick– But calibration against finite element analysis

essential