INTEGRAL ABUTMENTS DETAILS FOR ABC PROJECTS Travis Hosteng, Lowell Greimann, Sam Redd, and Brent Phares Bridge Engineering Center at Iowa State University
Overview: Integral Abutment
Integral Abutment
Standard Abutment
Overview: Grouted Coupler
Laboratory Specimens 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 Specimens Typical dimensions for all specimens: a) CIP specimen b) Rebar coupler specimen c) Pile coupler specimen
Control Specimen (CIP IA DOT Integral Abut) • This specimen will establish a baseline for the “new” ABC specimens
Grouted Coupler Specimen
• Splice the pile cap and integral diaphragm for ABC application • Seventeen #8 Bars and Grouted Couplers
Grouted Couplers: Conceptual Usage
Grouted Coupler - Alignment
Grouted Coupler Specimen
Pile Coupler Concept Usage
Pile Coupler Concept
Pile Coupler Specimen
24” CMP Section A - A
Section B - B
Pile Coupler – Pile Cap
Pile Coupler – Pile section
Pile Coupler – Integral Diaphragm
Pile Couplers Suspended
Pile Coupler Specimen – Construction Process Step 1: Slide abutment diaphragm section in place over pile cap (SIBC)
Pile Coupler Specimen – Construction Process Step 2: Place grout bed dams
Pile Coupler Specimen – Construction Process Step 3: Place grout bed; remove dams
Pile Coupler Specimen – Construction Process Step 4: Lower HP Section
Pile Coupler Specimen – Construction Process Step 5: Grout HP Voids
Testing Methodology
Scope of Laboratory Testing 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
Service Level Loads Dead + Live Load • Outside of abutment in tension
Thermal Expansion Load • Outside of abutment in tension
Service Level Loads
Thermal Contraction Load • Inside of abutment in tension
Test Setup B
A. 100 Kip horizontal B. 400 kip vertical A
Testing Progression Step #1 • Service level bending moments for a “common bridge”
Step #2 Increase loads to ultimate strength of the specimen
Concluding Remarks • Grouted coupler ▫ Has sufficient strength and serviceability. ▫ Performance is nearly the same as a conventional system. ▫ Tight construction tolerances.
• Pile coupler ▫ Lacks sufficient strength and serviceability. ▫ Easiest to construct. ▫ Updated details developed but not yet evaluated.
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