LABORATORY TESTING OF INTEGRAL ABUTMENT BRIDGE DETAILS FOR ABC

PROJECTS

FIU Webinar By: Sam Redd

July 2016

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Overview: Integral Abutment

Integral Abutment Jointed Abutment

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Overview: Integral Abutment in ABC

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Overview: Grouted Coupler

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Edison Bridge in Florida

Overview: Grouted Couplers

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1) Cast-in-place (CIP) – Iowa DOT design

2) Grouted Rebar Coupler – Dayton Superior Sleeve-Lock Coupler

3) Pile Coupler – HP pile section using CMP voids and grout

Laboratory Specimen 6

• Integral Connection - #8 bars @ ~12 in. O.C. along front and back face

Control: Cast-In-Place (CIP) Specimen Iowa DOT Design Detail

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• Splice the pile cap and integral diaphragm for ABC application

• Seventeen #8 Bars and Grouted Couplers

Grouted Coupler Specimen

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Grouted Couplers: Conceptual

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24” CMP

Section A - A Section B - B

Pile Coupler Specimen 10

Pile Coupler Specimen

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Pile Coupler Concept

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Laboratory Specimen Construction

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Typical dimensions for all specimens

Laboratory Specimens

8’

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Control: Cast-In-Place (CIP) Specimen Iowa DOT Design Detail

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Grouted Coupler – Pile Cap 16

Grouted Coupler - Template 17

Grouted Coupler – Integral Diaphragm

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Grouted Coupler - Alignment 19

Grouted Coupler Specimen 20

Pile Coupler – Pile Cap 21

Pile Coupler – Integral Diaphragm 22

Pile Coupler – HP Guides and Lid

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• CMP Lid - 1/8” Sheet metal circle or octagon w/ #4 Rebar guides welded in place • U-bolt and aircraft cable to lower pile

CMP Lid and HP section 24

Pile Coupler – Grout Vent 25

Pile Coupler – 3” Grout Duct 26

Pile Couplers Suspended

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Pile Coupler Specimen – Construction Process

Step 2: Place grout bed dams

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Pile Coupler Specimen – Construction Process

Step 3: Place grout bed; remove dams

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Step 4: Lower HP Section

Pile Coupler Specimen – Construction Process 30

Step 5: Grout HP Voids

Pile Coupler Specimen – Construction Process 31

Testing Methodology

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Strength • How strong is the pile cap /

integral diaphragm connection?

Durability • Does any cracking occur? • If so, what are the crack

widths under service level loads

Constructability • Ease of construction

Scope of Laboratory Testing 33

Test Philosophy

P vertical

P horizontal

Plastic moment of pile

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Test Setup

A. 100 Kip horizontal B. 400 kip vertical

A

B

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Test Results

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Before and After – CIP

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Before and After – Grouted Rebar Coupler

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Pile Coupler - After

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0.00

0.01

0.02

0.03

0.04

0.05

0.06

0 50 100 150 200 250 300

Cra

ck (i

n.)

Moment (k-ft)

Durability – Horizontal Load

Pile Coupler Grouted Rebar Coupler CIP

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0.00

0.02

0.04

0.06

0.08

0.10

0.12

0.14

0.16

0.18

0.20

0.22

0 200 400 600 800 1000 1200 1400 1600 1800 2000

Cra

ck (i

n.)

Moment (k-ft) Pile Coupler Grouted Rebar Coupler CIP

Durability – Vertical Load HP 14x117 Strong Axis

HP14x117 Weak Axis

HP 10x57 Strong Axis

HP 10x57 Weak Axis

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0

5

10

15

20

25

30

35

40

45

0 200 400 600 800 1000 1200 1400 1600 1800 2000

Reb

ar T

ensi

le S

tres

s (k

si)

Moment (ft-k) Grouted Rebar Coupler Cast-in-place

Strength – Vertical Load HP14x117 Weak Axis

HP 10x57 Strong Axis

HP 10x57 Weak Axis

HP 14x108 Strong Axis

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Pile Type and Allowable Crack Width

Reasonable crack width ACI – 0.012 in (soil)

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1) Cast-in-place (CIP) – Iowa DOT design ▫ Strong in comparison to foundation piles

2) Grouted Rebar Coupler – Dayton Superior Sleeve-Lock Coupler ▫ Two grouted coupler failures ▫ Similar performance to CIP ▫ Template facilitated erection

3) Pile Coupler – HP pile section using CMP voids and grout ▫ Construction process was successful ▫ Structural performance less than ideal

Conclusions 44

Questions?

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