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R27-SP42 Bridge Beams - Kickoff

MeetingJanuary 30, 2020

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Bridge Location

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Bridge Location

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Bridge Location

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IDOT Structure No. 020-3087

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IDOT Structure No. 020-3087

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IDOT Structure No. 020-3087

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IDOT Structure No. 020-3087

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IDOT Structure No. 020-3087

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Beam in Newmark Structural Engineering Laboratory

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Beam in Newmark Structural Engineering Laboratory

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Beam in Newmark Structural Engineering Laboratory

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Rebound Hammer Testing

• Compare concrete

quality at ends vs

midspan

• Rebound hammer

test results show

similar concrete

quality along the

length

• Supports to stay at

beam ends.

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• 3 point bending

• On NON-skewed supports

• Displacement control

• Deliverable: force and

displacement response for

loading to failure

• Force from actuator/load

cells

• Displacement from two

midspan potentiometers

• Non-contact displacement:

• Krypton system for

measuring displacements.

Test Setup

3d model link

https://app.sketchup.com/app?hl=en-US

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• Determine an upper bound on

force & displacement required

of test setup.

• Reponse2000

• 5ksi concrete

• 0.108 in2/strand

• 250 ksi PS strands

• 18.9 kip preload (no

losses)

• Mult ≈ 366 kip*ft

• Pult ≈ 52.5 kip

• Δult ≈ 6 in

• Actuator is 300 kip ±15” stroke

Bounding Analysis

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Beam supports

Test Setup

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Bearings for beam supports:

5” roller on each end, 6”x1” plate between roller and beam.

Wide flange for load distribution across mid-span

(TBD)

Test Setup

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• NTP on 11/16/19

• Kickoff meeting in Springfield on 12/17/19

• Scheduled for testing the week of 18th-21st

• 19th preferable for IDOT

Schedule

From the

signed work

agreement:

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• Krypton system

• Identification and tracking of points in

space and time

• Targets along each side at 1/8th points

• Mounted to blocks hot glued to beam

• Camera location? (TBD)

Discussion

Krypton